diff mbox series

[v9,18/22] drm/mediatek: Add mt8195 Embedded DisplayPort driver

Message ID 20220327223927.20848-19-granquet@baylibre.com
State New
Headers show
Series drm/mediatek: Add mt8195 DisplayPort driver | expand

Commit Message

Guillaume Ranquet March 27, 2022, 10:39 p.m. UTC 
From: Markus Schneider-Pargmann <msp@baylibre.com>

This patch adds a DisplayPort driver for the Mediatek mt8195 SoC.

It supports the mt8195, the embedded DisplayPort units. It offers
DisplayPort 1.4 with up to 4 lanes.

The driver shares its iomap range with the mtk-dp-phy driver using
the regmap/syscon facility.

This driver is based on an initial version by
Jason-JH.Lin <jason-jh.lin@mediatek.com>.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Reported-by: kernel test robot <lkp@intel.com>
---
 drivers/gpu/drm/mediatek/Kconfig       |    8 +
 drivers/gpu/drm/mediatek/Makefile      |    2 +
 drivers/gpu/drm/mediatek/mtk_dp.c      | 2221 ++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  568 ++++++
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |    1 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |    1 +
 6 files changed, 2801 insertions(+)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
 create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h

Comments

Maxime Ripard April 29, 2022, 8:39 a.m. UTC | #1 
Hi Guillaume,

On Mon, Mar 28, 2022 at 12:39:23AM +0200, Guillaume Ranquet wrote:
> From: Markus Schneider-Pargmann <msp@baylibre.com>
> 
> This patch adds a DisplayPort driver for the Mediatek mt8195 SoC.
> 
> It supports the mt8195, the embedded DisplayPort units. It offers
> DisplayPort 1.4 with up to 4 lanes.
> 
> The driver shares its iomap range with the mtk-dp-phy driver using
> the regmap/syscon facility.
> 
> This driver is based on an initial version by
> Jason-JH.Lin <jason-jh.lin@mediatek.com>.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Reported-by: kernel test robot <lkp@intel.com>

You don't need to set Reported-by on a patch introducing a new driver.
That would be typically done for a fix.

> ---
>  drivers/gpu/drm/mediatek/Kconfig       |    8 +
>  drivers/gpu/drm/mediatek/Makefile      |    2 +
>  drivers/gpu/drm/mediatek/mtk_dp.c      | 2221 ++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  568 ++++++
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c |    1 +
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h |    1 +
>  6 files changed, 2801 insertions(+)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h
> 
> diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
> index 2976d21e9a34..03ffa9b896c3 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -28,3 +28,11 @@ config DRM_MEDIATEK_HDMI
>  	select PHY_MTK_HDMI
>  	help
>  	  DRM/KMS HDMI driver for Mediatek SoCs
> +
> +config MTK_DPTX_SUPPORT
> +	tristate "DRM DPTX Support for Mediatek SoCs"
> +	depends on DRM_MEDIATEK
> +	select PHY_MTK_DP
> +	select DRM_DP_HELPER
> +	help
> +	  DRM/KMS Display Port driver for Mediatek SoCs.
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index 29098d7c8307..d86a6406055e 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -21,3 +21,5 @@ mediatek-drm-hdmi-objs := mtk_cec.o \
>  			  mtk_hdmi_ddc.o
>  
>  obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mediatek-drm-hdmi.o
> +
> +obj-$(CONFIG_MTK_DPTX_SUPPORT) += mtk_dp.o
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
> new file mode 100644
> index 000000000000..7cd8459cf719
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -0,0 +1,2221 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2019 MediaTek Inc.
> + * Copyright (c) 2021 BayLibre

2022?

> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/dp/drm_dp_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_probe_helper.h>
> +#include <linux/arm-smccc.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <sound/hdmi-codec.h>
> +#include <video/videomode.h>
> +
> +#include "mtk_dp_reg.h"
> +
> +#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
> +#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
> +
> +//TODO: platform/device data or dts?

DTS :)

> +#define MTK_DP_MAX_LANES 4
> +#define MTK_DP_MAX_LINK_RATE MTK_DP_LINKRATE_HBR3
> +
> +#define MTK_DP_TBC_BUF_READ_START_ADDR 0x08
> +
> +#define MTK_DP_TRAIN_RETRY_LIMIT 8
> +#define MTK_DP_TRAIN_MAX_ITERATIONS 5
> +
> +#define MTK_DP_AUX_WRITE_READ_WAIT_TIME_US 20
> +
> +#define MTK_DP_DP_VERSION_11 0x11
> +
> +enum mtk_dp_state {
> +	MTK_DP_STATE_INITIAL,
> +	MTK_DP_STATE_IDLE,
> +	MTK_DP_STATE_PREPARE,
> +	MTK_DP_STATE_NORMAL,
> +};
> +
> +enum mtk_dp_train_state {
> +	MTK_DP_TRAIN_STATE_STARTUP = 0,
> +	MTK_DP_TRAIN_STATE_CHECKCAP,
> +	MTK_DP_TRAIN_STATE_CHECKEDID,
> +	MTK_DP_TRAIN_STATE_TRAINING_PRE,
> +	MTK_DP_TRAIN_STATE_TRAINING,
> +	MTK_DP_TRAIN_STATE_NORMAL,
> +	MTK_DP_TRAIN_STATE_DPIDLE,
> +};
> +
> +struct mtk_dp_timings {
> +	struct videomode vm;
> +
> +	u16 htotal;
> +	u16 vtotal;
> +	u8 frame_rate;
> +	u32 pix_rate_khz;
> +};
> +
> +struct mtk_dp_train_info {
> +	bool tps3;
> +	bool tps4;
> +	bool sink_ssc;
> +	bool cable_plugged_in;
> +	bool cable_state_change;
> +	bool cr_done;
> +	bool eq_done;
> +
> +	/* link_rate is in multiple of 0.27Gbps */
> +	int link_rate;
> +	int lane_count;
> +
> +	u8  irq_status;
> +	int check_cap_count;
> +};
> +
> +/* Same values as used by the DP Spec for MISC0 bits 1 and 2 */
> +enum mtk_dp_color_format {
> +	MTK_DP_COLOR_FORMAT_RGB_444 = 0,
> +	MTK_DP_COLOR_FORMAT_YUV_422 = 1,
> +	MTK_DP_COLOR_FORMAT_YUV_444 = 2,
> +	MTK_DP_COLOR_FORMAT_YUV_420 = 3,
> +	MTK_DP_COLOR_FORMAT_YONLY = 4,
> +	MTK_DP_COLOR_FORMAT_RAW = 5,
> +	MTK_DP_COLOR_FORMAT_RESERVED = 6,
> +	MTK_DP_COLOR_FORMAT_DEFAULT = MTK_DP_COLOR_FORMAT_RGB_444,
> +	MTK_DP_COLOR_FORMAT_UNKNOWN = 15,
> +};

Isn't that redundant with DP_MSA_MISC_COLOR_* ?

> +/* Multiple of 0.27Gbps */
> +enum mtk_dp_linkrate {
> +	MTK_DP_LINKRATE_RBR = 0x6,
> +	MTK_DP_LINKRATE_HBR = 0xA,
> +	MTK_DP_LINKRATE_HBR2 = 0x14,
> +	MTK_DP_LINKRATE_HBR25 = 0x19,
> +	MTK_DP_LINKRATE_HBR3 = 0x1E,
> +};
> +
> +/* Same values as used for DP Spec MISC0 bits 5,6,7 */
> +enum mtk_dp_color_depth {
> +	MTK_DP_COLOR_DEPTH_6BIT = 0,
> +	MTK_DP_COLOR_DEPTH_8BIT = 1,
> +	MTK_DP_COLOR_DEPTH_10BIT = 2,
> +	MTK_DP_COLOR_DEPTH_12BIT = 3,
> +	MTK_DP_COLOR_DEPTH_16BIT = 4,
> +	MTK_DP_COLOR_DEPTH_UNKNOWN = 5,
> +};

DP_MSA_MISC_*_BPC?

> +struct mtk_dp_info {
> +	enum mtk_dp_color_depth depth;
> +	enum mtk_dp_color_format format;
> +	struct mtk_dp_timings timings;
> +};
> +
> +struct dp_cal_data {
> +	unsigned int glb_bias_trim;
> +	unsigned int clktx_impse;
> +
> +	//TODO: see above with MTK_DP_MAX_LANES, make it SoC specific
> +	unsigned int ln_tx_impsel_pmos[MTK_DP_MAX_LANES];
> +	unsigned int ln_tx_impsel_nmos[MTK_DP_MAX_LANES];
> +};
> +
> +struct mtk_dp {
> +	struct device *dev;
> +	struct phy *phy;
> +	struct dp_cal_data cal_data;
> +
> +	struct drm_device *drm_dev;
> +	struct drm_bridge bridge;
> +	struct drm_bridge *next_bridge;
> +	struct drm_dp_aux aux;
> +
> +	/* Protects edid as it is used in both bridge ops and IRQ handler */
> +	struct mutex edid_lock;
> +	struct edid *edid;
> +
> +	u8 rx_cap[DP_RECEIVER_CAP_SIZE];
> +
> +	struct mtk_dp_info info;
> +	enum mtk_dp_state state;
> +
> +	struct mtk_dp_train_info train_info;
> +	enum mtk_dp_train_state train_state;
> +	unsigned int input_fmt;
> +
> +	struct regmap *regs;
> +	struct clk *dp_tx_clk;
> +
> +	bool enabled;
> +
> +	bool has_fec;
> +	/* Protects the mtk_dp struct */
> +	struct mutex dp_lock;
> +
> +	hdmi_codec_plugged_cb plugged_cb;
> +	struct device *codec_dev;
> +	u8 connector_eld[MAX_ELD_BYTES];
> +	struct drm_connector *conn;
> +};
> +
> +static struct mtk_dp *mtk_dp_from_bridge(struct drm_bridge *b)
> +{
> +	return container_of(b, struct mtk_dp, bridge);
> +}
> +
> +static u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset)
> +{
> +	u32 read_val;
> +	int ret;
> +
> +	ret = regmap_read(mtk_dp->regs, offset, &read_val);
> +	if (ret) {
> +		dev_err(mtk_dp->dev, "Failed to read register 0x%x: %d\n",
> +			offset, ret);
> +		return 0;
> +	}
> +
> +	return read_val;
> +}
> +
> +static int mtk_dp_write(struct mtk_dp *mtk_dp, u32 offset, u32 val)
> +{
> +	int ret;
> +
> +	ret = regmap_write(mtk_dp->regs, offset, val);
> +	if (ret)
> +		dev_err(mtk_dp->dev,
> +			"Failed to write register 0x%x with value 0x%x: %d\n",
> +			offset, val, ret);
> +	return ret;
> +}
> +
> +static int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, u32 val,
> +			      u32 mask)
> +{
> +	int ret;
> +
> +	ret = regmap_update_bits(mtk_dp->regs, offset, mask, val);
> +	if (ret)
> +		dev_err(mtk_dp->dev,
> +			"Failed to update register 0x%x with value 0x%x, mask 0x%x: %d\n",
> +			offset, val, mask, ret);
> +	return ret;
> +}
> +
> +static int mtk_dp_bulk_16bit_write(struct mtk_dp *mtk_dp, u32 offset, u8 *buf,
> +				   size_t length)
> +{
> +	int i;
> +	int ret = 0;
> +	int num_regs = (length + 1) / 2;
> +
> +	/* 2 bytes per register */
> +	for (i = 0; i < num_regs; i++) {
> +		u32 val = buf[i * 2] |
> +			  (i * 2 + 1 < length ? buf[i * 2 + 1] << 8 : 0);
> +
> +		ret = mtk_dp_write(mtk_dp, offset + i * 4, val);
> +		if (ret)
> +			goto out;
> +	}
> +
> +out:
> +	return ret;
> +}
> +
> +static unsigned long mtk_dp_sip_atf_call(unsigned int cmd, unsigned int para)
> +{
> +	struct arm_smccc_res res;
> +
> +	arm_smccc_smc(MTK_DP_SIP_CONTROL_AARCH32, cmd, para, 0, 0, 0, 0, 0,
> +		      &res);
> +
> +	pr_debug("[DPTX]%s cmd 0x%x, p1 0x%x, ret 0x%lx-0x%lx", __func__, cmd,
> +		 para, res.a0, res.a1);
> +	return res.a1;
> +}
> +
> +static int mtk_dp_msa_bypass_disable(struct mtk_dp *mtk_dp)
> +{
> +	const u16 bits_to_set =
> +		BIT(HTOTAL_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(VTOTAL_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(HSTART_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(VSTART_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(HWIDTH_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(VHEIGHT_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(HSP_SEL_DP_ENC0_P0_SHIFT) | BIT(HSW_SEL_DP_ENC0_P0_SHIFT) |
> +		BIT(VSP_SEL_DP_ENC0_P0_SHIFT) | BIT(VSW_SEL_DP_ENC0_P0_SHIFT);
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, bits_to_set,
> +			   bits_to_set);
> +}
> +
> +#define MTK_UPD_BITS_OR_OUT(mtk_dp, offset, val, mask, ret, label) \
> +	do {\
> +		ret = mtk_dp_update_bits(mtk_dp, offset, val, mask); \
> +		if (ret) \
> +			goto label; \
> +	} while (0)
> +
> +static int mtk_dp_set_msa(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3010, timings->htotal,
> +			    HTOTAL_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3018,
> +			    timings->vm.hsync_len + timings->vm.hback_porch,
> +			   HSTART_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3028,
> +			    timings->vm.hsync_len << HSW_SW_DP_ENC0_P0_SHIFT,
> +			   HSW_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3028, 0,
> +			    HSP_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3020, timings->vm.hactive,
> +			    HWIDTH_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3014, timings->vtotal,
> +			    VTOTAL_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_301C,
> +			    timings->vm.vsync_len + timings->vm.vback_porch,
> +			   VSTART_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_302C,
> +			    timings->vm.vsync_len << VSW_SW_DP_ENC0_P0_SHIFT,
> +			   VSW_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_302C, 0,
> +			    VSP_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3024, timings->vm.vactive,
> +			    VHEIGHT_SW_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3064, timings->vm.hactive,
> +			    HDE_NUM_LAST_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3154, timings->htotal,
> +			    PGEN_HTOTAL_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3158,
> +			    timings->vm.hfront_porch,
> +			   PGEN_HSYNC_RISING_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_315C, timings->vm.hsync_len,
> +			    PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3160,
> +			    timings->vm.hback_porch + timings->vm.hsync_len,
> +			   PGEN_HFDE_START_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3164, timings->vm.hactive,
> +			    PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3168, timings->vtotal,
> +			    PGEN_VTOTAL_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_316C,
> +			    timings->vm.vfront_porch,
> +			   PGEN_VSYNC_RISING_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3170, timings->vm.vsync_len,
> +			    PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3174,
> +			    timings->vm.vback_porch + timings->vm.vsync_len,
> +			   PGEN_VFDE_START_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3178, timings->vm.vactive,
> +			    PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
> +				   enum mtk_dp_color_format color_format)
> +{
> +	u32 val;
> +	int ret;
> +
> +	mtk_dp->info.format = color_format;
> +
> +	/* Update MISC0 */
> +	ret = mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
> +				 color_format << DP_TEST_COLOR_FORMAT_SHIFT,
> +			   DP_TEST_COLOR_FORMAT_MASK);
> +
> +	if (ret)
> +		return ret;
> +
> +	switch (color_format) {
> +	case MTK_DP_COLOR_FORMAT_YUV_422:
> +		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422;
> +		break;
> +	case MTK_DP_COLOR_FORMAT_YUV_420:
> +		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420;
> +		break;
> +	case MTK_DP_COLOR_FORMAT_YONLY:
> +	case MTK_DP_COLOR_FORMAT_RAW:
> +	case MTK_DP_COLOR_FORMAT_RESERVED:
> +	case MTK_DP_COLOR_FORMAT_UNKNOWN:
> +		drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
> +			 color_format);
> +		fallthrough;
> +	case MTK_DP_COLOR_FORMAT_RGB_444:
> +	case MTK_DP_COLOR_FORMAT_YUV_444:
> +		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
> +		break;
> +	}
> +
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
> +			   PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK);
> +}
> +
> +static int mtk_dp_set_color_depth(struct mtk_dp *mtk_dp,
> +				  enum mtk_dp_color_depth color_depth)
> +{
> +	int ret;
> +	u32 val;
> +
> +	mtk_dp->info.depth = color_depth;
> +
> +	/* Update MISC0 */
> +	ret = mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
> +				 color_depth << DP_TEST_BIT_DEPTH_SHIFT,
> +			   DP_TEST_BIT_DEPTH_MASK);
> +
> +	if (ret)
> +		return ret;
> +
> +	switch (color_depth) {
> +	case MTK_DP_COLOR_DEPTH_6BIT:
> +		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT;
> +		break;
> +	case MTK_DP_COLOR_DEPTH_8BIT:
> +		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT;
> +		break;
> +	case MTK_DP_COLOR_DEPTH_10BIT:
> +		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT;
> +		break;
> +	case MTK_DP_COLOR_DEPTH_12BIT:
> +		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT;
> +		break;
> +	case MTK_DP_COLOR_DEPTH_16BIT:
> +		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT;
> +		break;
> +	case MTK_DP_COLOR_DEPTH_UNKNOWN:
> +		drm_warn(mtk_dp->drm_dev, "Unsupported color depth %d\n",
> +			 color_depth);
> +		return -EINVAL;
> +	}
> +
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
> +			   VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK);
> +}
> +
> +static int mtk_dp_mn_overwrite_disable(struct mtk_dp *mtk_dp)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
> +			   VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK);
> +}
> +
> +static int mtk_dp_set_sram_read_start(struct mtk_dp *mtk_dp, u32 val)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
> +			   val << SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT,
> +			   SRAM_START_READ_THRD_DP_ENC0_P0_MASK);
> +}
> +
> +static int mtk_dp_setup_encoder(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_303C,
> +			    BIT(VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT),
> +			VIDEO_MN_GEN_EN_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3040,
> +			    0x20 << SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT,
> +			SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3364,
> +			    0x20 << SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT,
> +			SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3300,
> +			    2 << VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT,
> +			VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3364,
> +			    4 << FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT,
> +			FIFO_READ_START_POINT_DP_ENC1_P0_MASK, ret, out);
> +	ret = mtk_dp_write(mtk_dp, MTK_DP_ENC1_P0_3368,
> +			   1 << VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT |
> +			1 << VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT |
> +			BIT(SDP_DP13_EN_DP_ENC1_P0_SHIFT) |
> +			1 << BS2BS_MODE_DP_ENC1_P0_SHIFT);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_pg_disable(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3038, 0,
> +			    VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_31B0,
> +			    4 << PGEN_PATTERN_SEL_SHIFT, PGEN_PATTERN_SEL_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static bool mtk_dp_plug_state(struct mtk_dp *mtk_dp)
> +{
> +	return !!(mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3414) &
> +		  HPD_DB_DP_TRANS_P0_MASK);
> +}
> +
> +static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
> +{
> +	mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640,
> +		     BIT(AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
> +		     BIT(AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT));
> +}
> +
> +static int mtk_dp_aux_set_cmd(struct mtk_dp *mtk_dp, u8 cmd, u32 addr)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3644, cmd,
> +			    MCU_REQUEST_COMMAND_AUX_TX_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3648, addr,
> +			    MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_364C, addr >> 16,
> +			    MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_aux_cmd_complete(struct mtk_dp *mtk_dp)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3650,
> +			   BIT(MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT),
> +			   MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK |
> +				   PHY_FIFO_RST_AUX_TX_P0_MASK |
> +				   MCU_REQ_DATA_NUM_AUX_TX_P0_MASK);
> +}
> +
> +static int mtk_dp_aux_request_ready(struct mtk_dp *mtk_dp)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3630,
> +			   BIT(AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT),
> +			   AUX_TX_REQUEST_READY_AUX_TX_P0_MASK);
> +}
> +
> +static void mtk_dp_aux_fill_write_fifo(struct mtk_dp *mtk_dp, u8 *buf,
> +				       size_t length)
> +{
> +	mtk_dp_bulk_16bit_write(mtk_dp, MTK_DP_AUX_P0_3708, buf, length);
> +}
> +
> +static int mtk_dp_aux_read_rx_fifo(struct mtk_dp *mtk_dp, u8 *buf,
> +				   size_t length, int read_delay)
> +{
> +	int ret;
> +	int read_pos;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3620, 0,
> +			    AUX_RD_MODE_AUX_TX_P0_MASK, ret, out);
> +
> +	for (read_pos = 0; read_pos < length; read_pos++) {
> +		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3620,
> +				    BIT(AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT),
> +				   AUX_RX_FIFO_READ_PULSE_TX_P0_MASK, ret, out);
> +		usleep_range(read_delay, read_delay * 2);
> +		buf[read_pos] =
> +			(u8)(mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3620) &
> +			     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK >>
> +				     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT);
> +	}
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_aux_set_length(struct mtk_dp *mtk_dp, size_t length)
> +{
> +	int ret;
> +
> +	if (length > 0) {
> +		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3650,
> +				    (length - 1)
> +				    << MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT,
> +				    MCU_REQ_DATA_NUM_AUX_TX_P0_MASK, ret, out);
> +		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_362C, 0,
> +				    AUX_NO_LENGTH_AUX_TX_P0_MASK |
> +				    AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
> +				    AUX_RESERVED_RW_0_AUX_TX_P0_MASK, ret, out);
> +	} else {
> +		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_362C,
> +				    BIT(AUX_NO_LENGTH_AUX_TX_P0_SHIFT),
> +				    AUX_NO_LENGTH_AUX_TX_P0_MASK |
> +				    AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
> +				    AUX_RESERVED_RW_0_AUX_TX_P0_MASK, ret, out);
> +	}
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_aux_wait_for_completion(struct mtk_dp *mtk_dp, bool is_read)
> +{
> +	int wait_reply = MTK_DP_AUX_WAIT_REPLY_COUNT;
> +
> +	while (--wait_reply) {
> +		u32 aux_irq_status;
> +
> +		if (is_read) {
> +			u32 fifo_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3618);
> +
> +			if (fifo_status &
> +			    (AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK |
> +			     AUX_RX_FIFO_FULL_AUX_TX_P0_MASK)) {
> +				return 0;
> +			}
> +		}
> +
> +		aux_irq_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3640);
> +		if (aux_irq_status & AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK)
> +			return 0;
> +
> +		if (aux_irq_status & AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK)
> +			return -ETIMEDOUT;
> +
> +		usleep_range(100, 500);
> +	}
> +
> +	return -ETIMEDOUT;
> +}
> +
> +static int mtk_dp_aux_do_transfer(struct mtk_dp *mtk_dp, bool is_read, u8 cmd,
> +				  u32 addr, u8 *buf, size_t length)
> +{
> +	int ret;
> +	u32 reply_cmd;
> +
> +	if (is_read && (length > DP_AUX_MAX_PAYLOAD_BYTES ||
> +			(cmd == DP_AUX_NATIVE_READ && !length)))
> +		return -EINVAL;
> +
> +	if (!is_read) {
> +		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
> +					 BIT(AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT),
> +				   AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK);
> +
> +		if (ret)
> +			return ret;
> +	}
> +
> +	mtk_dp_aux_cmd_complete(mtk_dp);
> +	mtk_dp_aux_irq_clear(mtk_dp);
> +	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
> +		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
> +
> +	mtk_dp_aux_set_cmd(mtk_dp, cmd, addr);
> +	mtk_dp_aux_set_length(mtk_dp, length);
> +
> +	if (!is_read) {
> +		if (length)
> +			mtk_dp_aux_fill_write_fifo(mtk_dp, buf, length);
> +
> +		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
> +					 AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK,
> +				   AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK);
> +
> +		if (ret)
> +			return ret;
> +	}
> +
> +	mtk_dp_aux_request_ready(mtk_dp);
> +
> +	ret = mtk_dp_aux_wait_for_completion(mtk_dp, is_read);
> +
> +	reply_cmd = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3624) &
> +		    AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK;
> +
> +	if (ret || reply_cmd) {
> +		u32 phy_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3628) &
> +				 AUX_RX_PHY_STATE_AUX_TX_P0_MASK;
> +		if (phy_status != AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE) {
> +			drm_err(mtk_dp->drm_dev,
> +				"AUX Rx Aux hang, need SW reset\n");
> +			return -EIO;
> +		}
> +
> +		mtk_dp_aux_cmd_complete(mtk_dp);
> +		mtk_dp_aux_irq_clear(mtk_dp);
> +
> +		usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
> +			     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
> +		return -ETIMEDOUT;
> +	}
> +
> +	if (!length) {
> +		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C, 0,
> +					 AUX_NO_LENGTH_AUX_TX_P0_MASK |
> +				   AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
> +				   AUX_RESERVED_RW_0_AUX_TX_P0_MASK);
> +
> +		if (ret)
> +			return ret;
> +
> +	} else if (is_read) {
> +		int read_delay;
> +
> +		if (cmd == (DP_AUX_I2C_READ | DP_AUX_I2C_MOT) ||
> +		    cmd == DP_AUX_I2C_READ)
> +			read_delay = 500;
> +		else
> +			read_delay = 100;
> +
> +		mtk_dp_aux_read_rx_fifo(mtk_dp, buf, length, read_delay);
> +	}
> +
> +	mtk_dp_aux_cmd_complete(mtk_dp);
> +	mtk_dp_aux_irq_clear(mtk_dp);
> +	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
> +		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
> +
> +	return 0;
> +}
> +
> +static bool mtk_dp_set_swing_pre_emphasis(struct mtk_dp *mtk_dp, int lane_num,
> +					  int swing_val, int preemphasis)
> +{
> +	int ret;
> +
> +	u32 lane_shift = lane_num * DP_TX1_VOLT_SWING_SHIFT;
> +
> +	if (lane_num < 0 || lane_num > 3)
> +		return false;
> +
> +	dev_dbg(mtk_dp->dev,
> +		"link training swing_val= 0x%x, preemphasis = 0x%x\n",
> +		swing_val, preemphasis);
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_SWING_EMP,
> +			    swing_val << (DP_TX0_VOLT_SWING_SHIFT + lane_shift),
> +			   DP_TX0_VOLT_SWING_MASK << lane_shift, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_SWING_EMP,
> +			    preemphasis << (DP_TX0_PRE_EMPH_SHIFT + lane_shift),
> +			   DP_TX0_PRE_EMPH_MASK << lane_shift, ret, out);
> +
> +out:
> +	return !ret;
> +}
> +
> +static int mtk_dp_reset_swing_pre_emphasis(struct mtk_dp *mtk_dp)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_SWING_EMP, 0,
> +			   DP_TX0_VOLT_SWING_MASK | DP_TX1_VOLT_SWING_MASK |
> +			   DP_TX2_VOLT_SWING_MASK |
> +			   DP_TX3_VOLT_SWING_MASK |
> +			   DP_TX0_PRE_EMPH_MASK | DP_TX1_PRE_EMPH_MASK |
> +			   DP_TX2_PRE_EMPH_MASK | DP_TX3_PRE_EMPH_MASK);
> +}
> +
> +static int mtk_dp_fec_enable(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3540,
> +			   enable ? BIT(FEC_EN_DP_TRANS_P0_SHIFT) : 0,
> +			   FEC_EN_DP_TRANS_P0_MASK);
> +}
> +
> +static int mtk_dp_hwirq_enable(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	u32 val = 0;
> +
> +	if (!enable)
> +		val = IRQ_MASK_DP_TRANS_P0_DISC_IRQ |
> +		      IRQ_MASK_DP_TRANS_P0_CONN_IRQ |
> +		      IRQ_MASK_DP_TRANS_P0_INT_IRQ;
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, val,
> +			   IRQ_MASK_DP_TRANS_P0_MASK);
> +}
> +
> +static int mtk_dp_initialize_settings(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_342C,
> +			    XTAL_FREQ_DP_TRANS_P0_DEFAULT,
> +			   XTAL_FREQ_DP_TRANS_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_3540,
> +			    BIT(FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT),
> +			   FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_31EC,
> +			    BIT(AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT),
> +			   AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
> +			    SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_IRQ_MASK, IRQ_MASK_AUX_TOP_IRQ,
> +			    IRQ_MASK_AUX_TOP_IRQ, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static void mtk_dp_initialize_hpd_detect_settings(struct mtk_dp *mtk_dp)
> +{
> +	// Debounce threshold
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> +			   8 << HPD_DEB_THD_DP_TRANS_P0_SHIFT,
> +			   HPD_DEB_THD_DP_TRANS_P0_MASK);
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> +			   (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
> +			    HPD_INT_THD_DP_TRANS_P0_UPPER_1100US)
> +				   << HPD_INT_THD_DP_TRANS_P0_SHIFT,
> +			   HPD_INT_THD_DP_TRANS_P0_MASK);
> +
> +	// Connect threshold 1.5ms + 5 x 0.1ms = 2ms
> +	// Disconnect threshold 1.5ms + 5 x 0.1ms = 2ms
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
> +			   (5 << HPD_DISC_THD_DP_TRANS_P0_SHIFT) |
> +				   (5 << HPD_CONN_THD_DP_TRANS_P0_SHIFT),
> +			   HPD_DISC_THD_DP_TRANS_P0_MASK |
> +				   HPD_CONN_THD_DP_TRANS_P0_MASK);
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3430,
> +			   HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT,
> +			   HPD_INT_THD_ECO_DP_TRANS_P0_MASK);
> +}
> +
> +static int mtk_dp_initialize_aux_settings(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	/* modify timeout threshold = 1595 [12 : 8] */
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_360C, 0x1595,
> +			    AUX_TIMEOUT_THR_AUX_TX_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3658, 0,
> +			    AUX_TX_OV_EN_AUX_TX_P0_MASK, ret, out);
> +	/* 25 for 26M */
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3634,
> +			    25 << AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT,
> +			   AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK, ret, out);
> +	/* 13 for 26M */
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3614,
> +			    13 << AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT,
> +			   AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_37C8,
> +			    BIT(MTK_ATOP_EN_AUX_TX_P0_SHIFT),
> +			   MTK_ATOP_EN_AUX_TX_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_initialize_digital_settings(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
> +			    VBID_VIDEO_MUTE_DP_ENC0_P0_MASK, ret, out);
> +	mtk_dp_set_color_format(mtk_dp, MTK_DP_COLOR_FORMAT_RGB_444);
> +	mtk_dp_set_color_depth(mtk_dp, MTK_DP_COLOR_DEPTH_8BIT);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3368,
> +			    1 << BS2BS_MODE_DP_ENC1_P0_SHIFT,
> +			   BS2BS_MODE_DP_ENC1_P0_MASK, ret, out);
> +
> +	/* dp tx encoder reset all sw */
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3004,
> +			    BIT(DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT),
> +			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK, ret, out);
> +	usleep_range(1000, 5000);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
> +			    DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_digital_sw_reset(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_340C,
> +			    BIT(DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT),
> +			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK, ret, out);
> +	usleep_range(1000, 5000);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_340C, 0,
> +			    DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_set_lanes(struct mtk_dp *mtk_dp, int lanes)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_35F0,
> +			    lanes == 0 ? 0 : BIT(3), BIT(3) | BIT(2), ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3000, lanes,
> +			    LANE_NUM_DP_ENC0_P0_MASK, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_34A4,
> +			    lanes << LANE_NUM_DP_TRANS_P0_SHIFT,
> +			   LANE_NUM_DP_TRANS_P0_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int link_rate_to_mb_per_s(struct mtk_dp *mtk_dp,
> +				 enum mtk_dp_linkrate linkrate)
> +{
> +	switch (linkrate) {
> +	default:
> +		drm_err(mtk_dp->drm_dev,
> +			"Implementation error, unknown linkrate %d\n",
> +			linkrate);
> +		fallthrough;
> +	case MTK_DP_LINKRATE_RBR:
> +		return 1620;
> +	case MTK_DP_LINKRATE_HBR:
> +		return 2700;
> +	case MTK_DP_LINKRATE_HBR2:
> +		return 5400;
> +	case MTK_DP_LINKRATE_HBR3:
> +		return 8100;
> +	}
> +}
> +
> +static u32 check_cal_data_valid(u32 min, u32 max, u32 val, u32 default_val)
> +{
> +	if (val < min || val > max)
> +		return default_val;
> +
> +	return val;
> +}
> +
> +static int mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
> +{
> +	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
> +	struct device *dev = mtk_dp->dev;
> +	struct nvmem_cell *cell;
> +	u32 *buf;
> +	size_t len;
> +
> +	cell = nvmem_cell_get(dev, "dp_calibration_data");
> +	if (IS_ERR(cell)) {
> +		dev_err(dev,
> +			"Error: Failed to get nvmem cell dp_calibration_data\n");
> +		return PTR_ERR(cell);
> +	}
> +
> +	buf = (u32 *)nvmem_cell_read(cell, &len);
> +	nvmem_cell_put(cell);
> +
> +	if (IS_ERR(buf) || ((len / sizeof(u32)) != 4)) {
> +		dev_err(dev,
> +			"Error: Failed to read nvmem_cell_read fail len %ld\n",
> +			(len / sizeof(u32)));
> +		return PTR_ERR(buf);
> +	}
> +
> +	cal_data->glb_bias_trim =
> +		check_cal_data_valid(1, 0x1e, (buf[3] >> 27) & 0x1f, 0xf);
> +	cal_data->clktx_impse =
> +		check_cal_data_valid(1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_pmos[0] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_nmos[0] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_pmos[1] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_nmos[1] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_pmos[2] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_nmos[2] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_pmos[3] =
> +		check_cal_data_valid(1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
> +	cal_data->ln_tx_impsel_nmos[3] =
> +		check_cal_data_valid(1, 0xe, buf[2] & 0xf, 0x8);
> +
> +	kfree(buf);
> +
> +	return 0;
> +}
> +
> +static int mtk_dp_set_cal_data(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_GLB_DPAUX_TX,
> +			    cal_data->clktx_impse << 20, RG_CKM_PT0_CKTX_IMPSEL, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_GLB_BIAS_GEN_00,
> +			    cal_data->glb_bias_trim << 16,
> +			   RG_XTP_GLB_BIAS_INTR_CTRL, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_0,
> +			    cal_data->ln_tx_impsel_pmos[0] << 12,
> +			   RG_XTP_LN0_TX_IMPSEL_PMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_0,
> +			    cal_data->ln_tx_impsel_nmos[0] << 16,
> +			   RG_XTP_LN0_TX_IMPSEL_NMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_1,
> +			    cal_data->ln_tx_impsel_pmos[1] << 12,
> +			   RG_XTP_LN1_TX_IMPSEL_PMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_1,
> +			    cal_data->ln_tx_impsel_nmos[1] << 16,
> +			   RG_XTP_LN1_TX_IMPSEL_NMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_2,
> +			    cal_data->ln_tx_impsel_pmos[2] << 12,
> +			   RG_XTP_LN2_TX_IMPSEL_PMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_2,
> +			    cal_data->ln_tx_impsel_nmos[2] << 16,
> +			   RG_XTP_LN2_TX_IMPSEL_NMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_3,
> +			    cal_data->ln_tx_impsel_pmos[3] << 12,
> +			   RG_XTP_LN3_TX_IMPSEL_PMOS, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_3,
> +			    cal_data->ln_tx_impsel_nmos[3] << 16,
> +			   RG_XTP_LN3_TX_IMPSEL_NMOS, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_phy_configure(struct mtk_dp *mtk_dp,
> +				enum mtk_dp_linkrate link_rate, int lane_count)
> +{
> +	int ret;
> +	union phy_configure_opts phy_opts = {
> +		.dp = {
> +			.link_rate = link_rate_to_mb_per_s(mtk_dp, link_rate),
> +			.set_rate = 1,
> +			.lanes = lane_count,
> +			.set_lanes = 1,
> +			.ssc = mtk_dp->train_info.sink_ssc,
> +		}
> +		};
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP,
> +			    DP_PWR_STATE_MASK, ret, out);
> +
> +	ret = phy_configure(mtk_dp->phy, &phy_opts);
> +
> +	if (ret)
> +		goto out;
> +
> +	mtk_dp_set_cal_data(mtk_dp);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE,
> +			    DP_PWR_STATE_BANDGAP_TPLL_LANE, DP_PWR_STATE_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_set_idle_pattern(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	const u32 val = POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK |
> +			POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK |
> +			POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK |
> +			POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK;
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3580, enable ? val : 0, val);
> +}
> +
> +//TODO: check return value in callee
> +static int mtk_dp_train_set_pattern(struct mtk_dp *mtk_dp, int pattern)
> +{
> +	if (pattern < 0 || pattern > 4) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Implementation error, no such pattern %d\n", pattern);
> +		return -EINVAL;
> +	}
> +
> +	if (pattern == 1) /* TPS1 */
> +		mtk_dp_set_idle_pattern(mtk_dp, false);
> +
> +	return mtk_dp_update_bits(mtk_dp,
> +			   MTK_DP_TRANS_P0_3400,
> +			   pattern ? BIT(pattern - 1) << PATTERN1_EN_DP_TRANS_P0_SHIFT : 0,
> +			   PATTERN1_EN_DP_TRANS_P0_MASK | PATTERN2_EN_DP_TRANS_P0_MASK |
> +			   PATTERN3_EN_DP_TRANS_P0_MASK |
> +			   PATTERN4_EN_DP_TRANS_P0_MASK);
> +}
> +
> +static int mtk_dp_set_enhanced_frame_mode(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000,
> +			   enable ? BIT(ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT) : 0,
> +			   ENHANCED_FRAME_EN_DP_ENC0_P0_MASK);
> +}
> +
> +static int mtk_dp_training_set_scramble(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3404,
> +			   enable ? DP_SCR_EN_DP_TRANS_P0_MASK : 0,
> +			   DP_SCR_EN_DP_TRANS_P0_MASK);
> +}
> +
> +static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	u32 val = BIT(VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT);
> +
> +	if (enable)
> +		val |= BIT(VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT);
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000, val,
> +			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
> +			   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
> +
> +	mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
> +}
> +
> +static int mtk_dp_power_enable(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, 0,
> +			    SW_RST_B_PHYD, ret, out);
> +	usleep_range(10, 200);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, SW_RST_B_PHYD,
> +			    SW_RST_B_PHYD, ret, out);
> +	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE,
> +			    DP_PWR_STATE_BANDGAP_TPLL,
> +			   DP_PWR_STATE_MASK, ret, out);
> +
> +out:
> +	return ret;
> +}
> +
> +static int mtk_dp_power_disable(struct mtk_dp *mtk_dp)
> +{
> +	int ret;
> +
> +	ret = mtk_dp_write(mtk_dp, MTK_DP_TOP_PWR_STATE, 0);
> +
> +	if (ret)
> +		goto out;
> +
> +	usleep_range(10, 200);
> +	ret = mtk_dp_write(mtk_dp, MTK_DP_0034,
> +			   DA_CKM_CKTX0_EN_FORCE_EN | DA_CKM_BIAS_LPF_EN_FORCE_VAL |
> +		     DA_CKM_BIAS_EN_FORCE_VAL |
> +		     DA_XTP_GLB_LDO_EN_FORCE_VAL |
> +		     DA_XTP_GLB_AVD10_ON_FORCE_VAL);
> +
> +	if (ret)
> +		goto out;
> +
> +	/* Disable RX */
> +	ret = mtk_dp_write(mtk_dp, MTK_DP_1040, 0);
> +
> +	if (ret)
> +		goto out;
> +
> +	ret = mtk_dp_write(mtk_dp, MTK_DP_TOP_MEM_PD,
> +			   0x550 | BIT(FUSE_SEL_SHIFT) | BIT(MEM_ISO_EN_SHIFT));
> +
> +out:
> +	return ret;
> +}
> +
> +static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
> +{
> +	mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR2;
> +	mtk_dp->train_info.lane_count = MTK_DP_MAX_LANES;
> +	mtk_dp->train_info.irq_status = 0;
> +	mtk_dp->train_info.cable_plugged_in = false;
> +	mtk_dp->train_info.cable_state_change = false;
> +	mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
> +	mtk_dp->state = MTK_DP_STATE_INITIAL;
> +
> +	mtk_dp->info.format = MTK_DP_COLOR_FORMAT_RGB_444;
> +	mtk_dp->info.depth = MTK_DP_COLOR_DEPTH_8BIT;
> +	memset(&mtk_dp->info.timings, 0, sizeof(struct mtk_dp_timings));
> +	mtk_dp->info.timings.frame_rate = 60;
> +
> +	mtk_dp->has_fec = false;
> +}
> +
> +static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
> +{
> +	u32 sram_read_start = MTK_DP_TBC_BUF_READ_START_ADDR;
> +
> +	if (mtk_dp->train_info.lane_count > 0) {
> +		sram_read_start = min_t(u32,
> +					MTK_DP_TBC_BUF_READ_START_ADDR,
> +					mtk_dp->info.timings.vm.hactive /
> +					(mtk_dp->train_info.lane_count * 4 * 2 * 2));
> +		mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
> +	}
> +
> +	mtk_dp_setup_encoder(mtk_dp);
> +}
> +
> +static void mtk_dp_calculate_pixrate(struct mtk_dp *mtk_dp)
> +{
> +	int target_frame_rate = 60;
> +	int target_pixel_clk;
> +
> +	if (mtk_dp->info.timings.frame_rate > 0) {
> +		target_frame_rate = mtk_dp->info.timings.frame_rate;
> +		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
> +				   (int)mtk_dp->info.timings.vtotal *
> +				   target_frame_rate;
> +	} else if (mtk_dp->info.timings.pix_rate_khz > 0) {
> +		target_pixel_clk = mtk_dp->info.timings.pix_rate_khz * 1000;
> +	} else {
> +		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
> +				   (int)mtk_dp->info.timings.vtotal *
> +				   target_frame_rate;
> +	}
> +
> +	if (target_pixel_clk > 0)
> +		mtk_dp->info.timings.pix_rate_khz = target_pixel_clk / 1000;
> +}
> +
> +static void mtk_dp_set_tx_out(struct mtk_dp *mtk_dp)
> +{
> +	mtk_dp_msa_bypass_disable(mtk_dp);
> +	mtk_dp_calculate_pixrate(mtk_dp);
> +	mtk_dp_pg_disable(mtk_dp);
> +	mtk_dp_setup_tu(mtk_dp);
> +}
> +
> +static void mtk_dp_train_update_swing_pre(struct mtk_dp *mtk_dp, int lanes,
> +					  u8 dpcd_adjust_req[2])
> +{
> +	int lane;
> +
> +	for (lane = 0; lane < lanes; ++lane) {
> +		u8 val;
> +		u8 swing;
> +		u8 preemphasis;
> +		int index = lane / 2;
> +		int shift = lane % 2 ? DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : 0;
> +
> +		swing = (dpcd_adjust_req[index] >> shift) &
> +			DP_ADJUST_VOLTAGE_SWING_LANE0_MASK;
> +		preemphasis = ((dpcd_adjust_req[index] >> shift) &
> +			       DP_ADJUST_PRE_EMPHASIS_LANE0_MASK) >>
> +			      DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT;
> +		val = swing << DP_TRAIN_VOLTAGE_SWING_SHIFT |
> +		      preemphasis << DP_TRAIN_PRE_EMPHASIS_SHIFT;
> +
> +		if (swing == DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
> +			val |= DP_TRAIN_MAX_SWING_REACHED;
> +		if (preemphasis == 3)
> +			val |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
> +
> +		mtk_dp_set_swing_pre_emphasis(mtk_dp, lane, swing, preemphasis);
> +		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_LANE0_SET + lane,
> +				   val);
> +	}
> +
> +	/* Wait for the signal to be stable enough */
> +	usleep_range(2000, 5000);
> +}
> +
> +static void mtk_dp_read_link_status(struct mtk_dp *mtk_dp,
> +				    u8 link_status[DP_LINK_STATUS_SIZE])
> +{
> +	drm_dp_dpcd_read(&mtk_dp->aux, DP_LANE0_1_STATUS, link_status,
> +			 DP_LINK_STATUS_SIZE);
> +}
> +
> +static int mtk_dp_train_flow(struct mtk_dp *mtk_dp, int target_link_rate,
> +			     int target_lane_count)
> +{
> +	u8 link_status[DP_LINK_STATUS_SIZE] = {};
> +	u8 lane_adjust[2] = {};
> +	bool pass_tps1 = false;
> +	bool pass_tps2_3 = false;
> +	int train_retries;
> +	int status_control;
> +	int iteration_count;
> +	u8 prev_lane_adjust;
> +	u8 val;
> +
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LINK_BW_SET, target_link_rate);
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
> +			   target_lane_count | DP_LANE_COUNT_ENHANCED_FRAME_EN);
> +
> +	if (mtk_dp->train_info.sink_ssc)
> +		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_DOWNSPREAD_CTRL,
> +				   DP_SPREAD_AMP_0_5);
> +
> +	train_retries = 0;
> +	status_control = 0;
> +	iteration_count = 1;
> +	prev_lane_adjust = 0xFF;
> +
> +	mtk_dp_set_lanes(mtk_dp, target_lane_count / 2);
> +	mtk_dp_phy_configure(mtk_dp, target_link_rate, target_lane_count);
> +
> +	dev_dbg(mtk_dp->dev,
> +		"Link train target_link_rate = 0x%x, target_lane_count = 0x%x\n",
> +		target_link_rate, target_lane_count);
> +
> +	do {
> +		train_retries++;
> +		if (!mtk_dp->train_info.cable_plugged_in ||
> +		    ((mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) !=
> +		     0x0)) {
> +			return -ENODEV;
> +		}
> +
> +		if (mtk_dp->train_state < MTK_DP_TRAIN_STATE_TRAINING)
> +			return -EAGAIN;
> +
> +		if (!pass_tps1) {
> +			mtk_dp_training_set_scramble(mtk_dp, false);
> +
> +			if (status_control == 0) {
> +				status_control = 1;
> +				mtk_dp_train_set_pattern(mtk_dp, 1);
> +				val = DP_LINK_SCRAMBLING_DISABLE |
> +				      DP_TRAINING_PATTERN_1;
> +				drm_dp_dpcd_writeb(&mtk_dp->aux,
> +						   DP_TRAINING_PATTERN_SET,
> +						   DP_LINK_SCRAMBLING_DISABLE |
> +						   DP_TRAINING_PATTERN_1);
> +				drm_dp_dpcd_read(&mtk_dp->aux,
> +						 DP_ADJUST_REQUEST_LANE0_1,
> +						 lane_adjust,
> +						 sizeof(lane_adjust));
> +				iteration_count++;
> +
> +				mtk_dp_train_update_swing_pre(mtk_dp,
> +							      target_lane_count, lane_adjust);
> +			}
> +
> +			drm_dp_link_train_clock_recovery_delay(&mtk_dp->aux,
> +							       mtk_dp->rx_cap);
> +			mtk_dp_read_link_status(mtk_dp, link_status);
> +
> +			if (drm_dp_clock_recovery_ok(link_status,
> +						     target_lane_count)) {
> +				mtk_dp->train_info.cr_done = true;
> +				pass_tps1 = true;
> +				train_retries = 0;
> +				iteration_count = 1;
> +				dev_dbg(mtk_dp->dev, "Link train CR pass\n");
> +			} else if (prev_lane_adjust == link_status[4]) {
> +				iteration_count++;
> +				if (prev_lane_adjust &
> +				    DP_ADJUST_VOLTAGE_SWING_LANE0_MASK)
> +					break;
> +			} else {
> +				prev_lane_adjust = link_status[4];
> +			}
> +			dev_dbg(mtk_dp->dev, "Link train CQ fail\n");
> +		} else if (pass_tps1 && !pass_tps2_3) {
> +			if (status_control == 1) {
> +				status_control = 2;
> +				if (mtk_dp->train_info.tps4) {
> +					mtk_dp_train_set_pattern(mtk_dp, 4);
> +					val = DP_TRAINING_PATTERN_4;
> +				} else if (mtk_dp->train_info.tps3) {
> +					mtk_dp_train_set_pattern(mtk_dp, 3);
> +					val = DP_LINK_SCRAMBLING_DISABLE |
> +					      DP_TRAINING_PATTERN_3;
> +				} else {
> +					mtk_dp_train_set_pattern(mtk_dp, 2);
> +					val = DP_LINK_SCRAMBLING_DISABLE |
> +					      DP_TRAINING_PATTERN_2;
> +				}
> +				drm_dp_dpcd_writeb(&mtk_dp->aux,
> +						   DP_TRAINING_PATTERN_SET,
> +						   val);
> +
> +				drm_dp_dpcd_read(&mtk_dp->aux,
> +						 DP_ADJUST_REQUEST_LANE0_1,
> +						 lane_adjust,
> +						 sizeof(lane_adjust));
> +
> +				iteration_count++;
> +				mtk_dp_train_update_swing_pre(mtk_dp,
> +							      target_lane_count, lane_adjust);
> +			}
> +
> +			drm_dp_link_train_channel_eq_delay(&mtk_dp->aux,
> +							   mtk_dp->rx_cap);
> +
> +			mtk_dp_read_link_status(mtk_dp, link_status);
> +
> +			if (!drm_dp_clock_recovery_ok(link_status,
> +						      target_lane_count)) {
> +				mtk_dp->train_info.cr_done = false;
> +				mtk_dp->train_info.eq_done = false;
> +				dev_dbg(mtk_dp->dev, "Link train EQ fail\n");
> +				break;
> +			}
> +
> +			if (drm_dp_channel_eq_ok(link_status,
> +						 target_lane_count)) {
> +				mtk_dp->train_info.eq_done = true;
> +				pass_tps2_3 = true;
> +				dev_dbg(mtk_dp->dev, "Link train EQ pass\n");
> +				break;
> +			}
> +
> +			if (prev_lane_adjust == link_status[4])
> +				iteration_count++;
> +			else
> +				prev_lane_adjust = link_status[4];
> +		}
> +
> +		drm_dp_dpcd_read(&mtk_dp->aux, DP_ADJUST_REQUEST_LANE0_1,
> +				 lane_adjust, sizeof(lane_adjust));
> +		mtk_dp_train_update_swing_pre(mtk_dp, target_lane_count,
> +					      lane_adjust);
> +	} while (train_retries < MTK_DP_TRAIN_RETRY_LIMIT &&
> +		 iteration_count < MTK_DP_TRAIN_MAX_ITERATIONS);
> +
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
> +			   DP_TRAINING_PATTERN_DISABLE);
> +	mtk_dp_train_set_pattern(mtk_dp, 0);
> +
> +	if (!pass_tps2_3)
> +		return -ETIMEDOUT;
> +
> +	mtk_dp->train_info.link_rate = target_link_rate;
> +	mtk_dp->train_info.lane_count = target_lane_count;
> +
> +	mtk_dp_training_set_scramble(mtk_dp, true);
> +
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
> +			   target_lane_count |
> +				   DP_LANE_COUNT_ENHANCED_FRAME_EN);
> +	mtk_dp_set_enhanced_frame_mode(mtk_dp, true);
> +
> +	return 0;
> +}
> +
> +static bool mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
> +{
> +	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
> +	u8 val;
> +	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
> +
> +	if (!mtk_dp_plug_state(mtk_dp))
> +		return false;
> +
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
> +	usleep_range(2000, 5000);
> +
> +	drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
> +
> +	memcpy(mtk_dp->rx_cap, buf, min(sizeof(mtk_dp->rx_cap), sizeof(buf)));
> +	mtk_dp->rx_cap[DP_TRAINING_AUX_RD_INTERVAL] &= DP_TRAINING_AUX_RD_MASK;
> +
> +	train_info->link_rate =
> +		min_t(int, MTK_DP_MAX_LINK_RATE, buf[DP_MAX_LINK_RATE]);
> +	train_info->lane_count =
> +		min_t(int, MTK_DP_MAX_LANES, drm_dp_max_lane_count(buf));
> +
> +	train_info->tps3 = drm_dp_tps3_supported(buf);
> +	train_info->tps4 = drm_dp_tps4_supported(buf);
> +
> +	train_info->sink_ssc =
> +		!!(buf[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5);
> +
> +	train_info->sink_ssc = false;
> +
> +	drm_dp_dpcd_readb(&mtk_dp->aux, DP_MSTM_CAP, &val);
> +	if (val & DP_MST_CAP) {
> +		/* Clear DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 */
> +		drm_dp_dpcd_readb(&mtk_dp->aux,
> +				  DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, &val);
> +		if (val)
> +			drm_dp_dpcd_writeb(&mtk_dp->aux,
> +					   DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0,
> +					   val);
> +	}
> +
> +	return true;
> +}
> +
> +static void mtk_dp_train_change_mode(struct mtk_dp *mtk_dp)
> +{
> +	phy_reset(mtk_dp->phy);
> +	mtk_dp_reset_swing_pre_emphasis(mtk_dp);
> +
> +	usleep_range(2000, 5000);
> +}
> +
> +static int mtk_dp_train_start(struct mtk_dp *mtk_dp)
> +{
> +	int ret = 0;
> +	int lane_count;
> +	int link_rate;
> +	int train_limit;
> +	int max_link_rate;
> +	int plug_wait;
> +
> +	for (plug_wait = 7; !mtk_dp_plug_state(mtk_dp) && plug_wait > 0;
> +	     --plug_wait)
> +		usleep_range(1000, 5000);
> +	if (plug_wait == 0) {
> +		mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
> +		return -ENODEV;
> +	}
> +
> +	link_rate = mtk_dp->rx_cap[1];
> +	lane_count = mtk_dp->rx_cap[2] & 0x1F;
> +
> +	mtk_dp->train_info.link_rate = min(MTK_DP_MAX_LINK_RATE, link_rate);
> +	mtk_dp->train_info.lane_count = min(MTK_DP_MAX_LANES, lane_count);
> +	link_rate = mtk_dp->train_info.link_rate;
> +	lane_count = mtk_dp->train_info.lane_count;
> +
> +	switch (link_rate) {
> +	case MTK_DP_LINKRATE_RBR:
> +	case MTK_DP_LINKRATE_HBR:
> +	case MTK_DP_LINKRATE_HBR2:
> +	case MTK_DP_LINKRATE_HBR25:
> +	case MTK_DP_LINKRATE_HBR3:
> +		break;
> +	default:
> +		mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR3;
> +		break;
> +	};
>+
> +	max_link_rate = link_rate;
> +	for (train_limit = 6; train_limit > 0; train_limit--) {
> +		mtk_dp->train_info.cr_done = false;
> +		mtk_dp->train_info.eq_done = false;
> +
> +		mtk_dp_train_change_mode(mtk_dp);
> +		ret = mtk_dp_train_flow(mtk_dp, link_rate, lane_count);
> +		if (ret)
> +			return ret;
> +
> +		if (!mtk_dp->train_info.cr_done) {
> +			switch (link_rate) {
> +			case MTK_DP_LINKRATE_RBR:
> +				lane_count = lane_count / 2;
> +				link_rate = max_link_rate;
> +				if (lane_count == 0) {
> +					mtk_dp->train_state =
> +						MTK_DP_TRAIN_STATE_DPIDLE;
> +					return -EIO;
> +				}
> +				break;
> +			case MTK_DP_LINKRATE_HBR:
> +				link_rate = MTK_DP_LINKRATE_RBR;
> +				break;
> +			case MTK_DP_LINKRATE_HBR2:
> +				link_rate = MTK_DP_LINKRATE_HBR;
> +				break;
> +			case MTK_DP_LINKRATE_HBR3:
> +				link_rate = MTK_DP_LINKRATE_HBR2;
> +				break;
> +			default:
> +				return -EINVAL;
> +			};
> +		} else if (!mtk_dp->train_info.eq_done) {
> +			if (lane_count == 0)
> +				return -EIO;
> +
> +			lane_count /= 2;
> +		} else {
> +			break;
> +		}
> +	}
> +
> +	if (train_limit == 0)
> +		return -ETIMEDOUT;
> +
> +	return 0;
> +}
> +
> +static int mtk_dp_train_handler(struct mtk_dp *mtk_dp)
> +{
> +	int ret = 0;
> +	int i = 50;
> +
> +	for (; ret && i; i--) {
> +		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
> +			continue;
> +
> +		switch (mtk_dp->train_state) {
> +		case MTK_DP_TRAIN_STATE_STARTUP:
> +			mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
> +			break;
> +
> +		case MTK_DP_TRAIN_STATE_CHECKCAP:
> +			if (mtk_dp_parse_capabilities(mtk_dp)) {
> +				mtk_dp->train_info.check_cap_count = 0;
> +				mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKEDID;
> +			} else {
> +				mtk_dp->train_info.check_cap_count++;
> +
> +				if (mtk_dp->train_info.check_cap_count >
> +					MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT) {
> +					mtk_dp->train_info.check_cap_count = 0;
> +					mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
> +					ret = -ETIMEDOUT;
> +				}
> +			}
> +			break;
> +
> +		case MTK_DP_TRAIN_STATE_CHECKEDID:
> +			mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
> +			break;
> +
> +		case MTK_DP_TRAIN_STATE_TRAINING_PRE:
> +			mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
> +			break;
> +
> +		case MTK_DP_TRAIN_STATE_TRAINING:
> +			ret = mtk_dp_train_start(mtk_dp);
> +			if (!ret) {
> +				mtk_dp_video_mute(mtk_dp, true);
> +				mtk_dp->train_state = MTK_DP_TRAIN_STATE_NORMAL;
> +				mtk_dp_fec_enable(mtk_dp, mtk_dp->has_fec);
> +			} else if (ret != -EAGAIN) {
> +				mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
> +			}
> +
> +			ret = 0;
> +			break;
> +
> +		case MTK_DP_TRAIN_STATE_NORMAL:
> +			break;
> +		case MTK_DP_TRAIN_STATE_DPIDLE:
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
> +	if (ret)
> +		drm_err(mtk_dp->drm_dev, "Train handler failed %d\n", ret);
> +
> +	return ret;
> +}

I'm not really familiar with displayport, but it looks like you're
hand-rolling a significant part of what the drm_dp_* helpers provide.

> +static void mtk_dp_video_enable(struct mtk_dp *mtk_dp, bool enable)
> +{
> +	if (enable) {
> +		mtk_dp_set_tx_out(mtk_dp);
> +		mtk_dp_video_mute(mtk_dp, false);
> +	} else {
> +		mtk_dp_video_mute(mtk_dp, true);
> +	}
> +}
> +
> +static void mtk_dp_video_config(struct mtk_dp *mtk_dp)
> +{
> +	mtk_dp_mn_overwrite_disable(mtk_dp);
> +
> +	mtk_dp_set_msa(mtk_dp);
> +
> +	mtk_dp_set_color_depth(mtk_dp, mtk_dp->info.depth);
> +	mtk_dp_set_color_format(mtk_dp, mtk_dp->info.format);
> +}
> +
> +static void mtk_dp_state_handler(struct mtk_dp *mtk_dp)
> +{
> +	switch (mtk_dp->state) {
> +	case MTK_DP_STATE_INITIAL:
> +		mtk_dp_video_mute(mtk_dp, true);
> +		mtk_dp->state = MTK_DP_STATE_IDLE;
> +		break;
> +
> +	case MTK_DP_STATE_IDLE:
> +		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
> +			mtk_dp->state = MTK_DP_STATE_PREPARE;
> +		break;
> +
> +	case MTK_DP_STATE_PREPARE:
> +		mtk_dp_video_config(mtk_dp);
> +		mtk_dp_video_enable(mtk_dp, true);
> +
> +		mtk_dp->state = MTK_DP_STATE_NORMAL;
> +		break;
> +
> +	case MTK_DP_STATE_NORMAL:
> +		if (mtk_dp->train_state != MTK_DP_TRAIN_STATE_NORMAL) {
> +			mtk_dp_video_mute(mtk_dp, true);
> +			mtk_dp->state = MTK_DP_STATE_IDLE;
> +		}
> +		break;
> +
> +	default:
> +		break;
> +	}
> +}
> +
> +static void mtk_dp_init_port(struct mtk_dp *mtk_dp)
> +{
> +	mtk_dp_set_idle_pattern(mtk_dp, true);
> +	mtk_dp_initialize_priv_data(mtk_dp);
> +
> +	mtk_dp_initialize_settings(mtk_dp);
> +	mtk_dp_initialize_aux_settings(mtk_dp);
> +	mtk_dp_initialize_digital_settings(mtk_dp);
> +	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3690,
> +			   BIT(RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT),
> +			   RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK);
> +	mtk_dp_initialize_hpd_detect_settings(mtk_dp);
> +
> +	mtk_dp_digital_sw_reset(mtk_dp);
> +}
> +
> +static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
> +			   struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	int ret = 0;
> +	void __iomem *base;
> +
> +	base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	mtk_dp->regs = syscon_node_to_regmap(dev->of_node);
> +	if (IS_ERR(mtk_dp->regs))
> +		return PTR_ERR(mtk_dp->regs);
> +
> +	//TODO: optional clock?
> +	mtk_dp->dp_tx_clk = devm_clk_get(dev, "faxi");
> +	if (IS_ERR(mtk_dp->dp_tx_clk)) {
> +		ret = PTR_ERR(mtk_dp->dp_tx_clk);
> +		dev_info(dev, "Failed to get dptx clock: %d\n", ret);
> +		mtk_dp->dp_tx_clk = NULL;
> +	}
> +
> +	return 0;
> +}
> +
> +static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
> +{
> +	return connector_status_connected;
> +}

I'm not quite sure what's going on there. You seem to have some support
for HPD interrupts above, but you always report the display as
connected?

I'd assume that either you don't have HPD support and then always report
it as connected, or you have HPD support and report the current status
in detect, but that combination seems weird.

> +static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
> +				    struct drm_connector *connector)
> +{
> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> +	bool enabled = mtk_dp->enabled;
> +	struct edid *new_edid = NULL;
> +
> +	if (!enabled)
> +		drm_bridge_chain_pre_enable(bridge);
> +
> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
> +	usleep_range(2000, 5000);
> +
> +	if (mtk_dp_plug_state(mtk_dp))
> +		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
> +
> +	if (!enabled)
> +		drm_bridge_chain_post_disable(bridge);

Are you sure we can't get a mode set while get_edid is called?

If we can, then you could end up disabling the device while it's being
powered on.

> +	mutex_lock(&mtk_dp->edid_lock);
> +	kfree(mtk_dp->edid);
> +	mtk_dp->edid = NULL;
> +
> +	if (!new_edid) {
> +		mutex_unlock(&mtk_dp->edid_lock);
> +		return NULL;
> +	}
> +
> +	mtk_dp->edid = drm_edid_duplicate(new_edid);
> +	mutex_unlock(&mtk_dp->edid_lock);

Why do you need a copy of the edid there?

> +	return new_edid;
> +}
> +
> +static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
> +				   struct drm_dp_aux_msg *msg)
> +{
> +	struct mtk_dp *mtk_dp;
> +	bool is_read;
> +	u8 request;
> +	size_t accessed_bytes = 0;
> +	int retry = 3, ret = 0;
> +
> +	mtk_dp = container_of(mtk_aux, struct mtk_dp, aux);
> +
> +	if (!mtk_dp->train_info.cable_plugged_in ||
> +	    mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) {
> +		mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
> +		ret = -EAGAIN;
> +		goto err;
> +	}
> +
> +	switch (msg->request) {
> +	case DP_AUX_I2C_MOT:
> +	case DP_AUX_I2C_WRITE:
> +	case DP_AUX_NATIVE_WRITE:
> +	case DP_AUX_I2C_WRITE_STATUS_UPDATE:
> +	case DP_AUX_I2C_WRITE_STATUS_UPDATE | DP_AUX_I2C_MOT:
> +		request = msg->request & ~DP_AUX_I2C_WRITE_STATUS_UPDATE;
> +		is_read = false;
> +		break;
> +	case DP_AUX_I2C_READ:
> +	case DP_AUX_NATIVE_READ:
> +	case DP_AUX_I2C_READ | DP_AUX_I2C_MOT:
> +		request = msg->request;
> +		is_read = true;
> +		break;
> +	default:
> +		drm_err(mtk_aux->drm_dev, "invalid aux cmd = %d\n",
> +			msg->request);
> +		ret = -EINVAL;
> +		goto err;
> +	}
> +
> +	if (msg->size == 0) {
> +		ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
> +					     msg->address + accessed_bytes,
> +					     msg->buffer + accessed_bytes, 0);
> +	} else {
> +		while (accessed_bytes < msg->size) {
> +			size_t to_access =
> +				min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES,
> +				      msg->size - accessed_bytes);
> +			while (retry--) {
> +				ret = mtk_dp_aux_do_transfer(mtk_dp,
> +							     is_read, request,
> +							     msg->address + accessed_bytes,
> +							     msg->buffer + accessed_bytes,
> +							     to_access);
> +				if (ret == 0)
> +					break;
> +				usleep_range(50, 100);
> +			}
> +			if (!retry || ret) {
> +				drm_info(mtk_dp->drm_dev,
> +					 "Failed to do AUX transfer: %d\n",
> +					 ret);
> +				break;
> +			}
> +			accessed_bytes += to_access;
> +		}
> +	}
> +err:
> +	if (ret) {
> +		msg->reply = DP_AUX_NATIVE_REPLY_NACK | DP_AUX_I2C_REPLY_NACK;
> +		return ret;
> +	}
> +
> +	msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
> +	return msg->size;
> +}
> +
> +static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
> +{
> +	mutex_lock(&mtk_dp->dp_lock);
> +
> +	mtk_dp_hwirq_enable(mtk_dp, false);
> +	mtk_dp_power_disable(mtk_dp);
> +	phy_exit(mtk_dp->phy);
> +	clk_disable_unprepare(mtk_dp->dp_tx_clk);
> +
> +	mutex_unlock(&mtk_dp->dp_lock);
> +}
> +
> +static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
> +{
> +	int ret = 0;
> +
> +	mutex_lock(&mtk_dp->dp_lock);
> +
> +	ret = clk_prepare_enable(mtk_dp->dp_tx_clk);
> +	if (ret < 0) {
> +		dev_err(mtk_dp->dev, "Fail to enable clock: %d\n", ret);
> +		goto err;
> +	}
> +	ret = phy_init(mtk_dp->phy);
> +	if (ret) {
> +		dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n", ret);
> +		goto err_phy_init;
> +	}
> +	ret = mtk_dp_phy_configure(mtk_dp, MTK_DP_LINKRATE_RBR, 1);
> +	if (ret) {
> +		dev_err(mtk_dp->dev, "Failed to configure phy: %d\n", ret);
> +		goto err_phy_config;
> +	}
> +
> +	mtk_dp_init_port(mtk_dp);
> +	mtk_dp_power_enable(mtk_dp);
> +	mtk_dp_hwirq_enable(mtk_dp, true);
> +
> +err_phy_config:
> +	phy_exit(mtk_dp->phy);
> +err_phy_init:
> +	clk_disable_unprepare(mtk_dp->dp_tx_clk);
> +err:
> +	mutex_unlock(&mtk_dp->dp_lock);
> +	return ret;
> +}
> +
> +static int mtk_dp_bridge_attach(struct drm_bridge *bridge,
> +				enum drm_bridge_attach_flags flags)
> +{
> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> +	int ret;
> +
> +	ret = mtk_dp_poweron(mtk_dp);
> +	if (ret)
> +		return ret;
> +
> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +		dev_err(mtk_dp->dev, "Driver does not provide a connector!");
> +		return -EINVAL;
> +	}
> +
> +	if (mtk_dp->next_bridge) {
> +		ret = drm_bridge_attach(bridge->encoder, mtk_dp->next_bridge,
> +					&mtk_dp->bridge, flags);
> +		if (ret) {
> +			drm_warn(mtk_dp->drm_dev,
> +				 "Failed to attach external bridge: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	mtk_dp->drm_dev = bridge->dev;
> +
> +	return 0;
> +}
> +
> +static void mtk_dp_bridge_detach(struct drm_bridge *bridge)
> +{
> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> +
> +	mtk_dp->drm_dev = NULL;
> +}
> +
> +static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
> +					 struct drm_bridge_state *old_state)
> +{
> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> +
> +	mtk_dp_video_mute(mtk_dp, true);
> +	mtk_dp->state = MTK_DP_STATE_IDLE;
> +	mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
> +
> +	mtk_dp->enabled = false;
> +	msleep(100);
> +	mtk_dp_poweroff(mtk_dp);
> +}
> +
> +static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
> +					  struct drm_display_mode *mode)
> +{
> +	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
> +
> +	drm_display_mode_to_videomode(mode, &timings->vm);
> +	timings->frame_rate = mode->clock * 1000 / mode->htotal / mode->vtotal;

drm_mode_vrefresh()

> +	timings->htotal = mode->htotal;
> +	timings->vtotal = mode->vtotal;
> +}

It's not really clear to me why you need to duplicate drm_display_mode
here?

> +static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
> +					struct drm_bridge_state *old_state)
> +{
> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> +	struct drm_connector_state *conn_state;
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *crtc_state;
> +
> +	mtk_dp->conn = drm_atomic_get_new_connector_for_encoder(old_state->base.state,
> +								bridge->encoder);
> +	if (!mtk_dp->conn) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Can't enable bridge as connector is missing\n");
> +		return;
> +	}
> +
> +	memcpy(mtk_dp->connector_eld, mtk_dp->conn->eld, MAX_ELD_BYTES);
> +
> +	conn_state =
> +		drm_atomic_get_new_connector_state(old_state->base.state, mtk_dp->conn);
> +	if (!conn_state) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Can't enable bridge as connector state is missing\n");
> +		return;
> +	}
> +
> +	crtc = conn_state->crtc;
> +	if (!crtc) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Can't enable bridge as connector state doesn't have a crtc\n");
> +		return;
> +	}
> +
> +	crtc_state = drm_atomic_get_new_crtc_state(old_state->base.state, crtc);
> +	if (!crtc_state) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Can't enable bridge as crtc state is missing\n");
> +		return;
> +	}
> +
> +	mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state->adjusted_mode);
> +	if (!mtk_dp_parse_capabilities(mtk_dp)) {
> +		drm_err(mtk_dp->drm_dev,
> +			"Can't enable bridge as nothing is plugged in\n");
> +		return;
> +	}

All this needs to be done in atomic_check. You aren't allowed to fail in
atomic_enable.

Maxime
Maxime Ripard May 12, 2022, 7:44 a.m. UTC | #2 
Hi,

On Wed, May 11, 2022 at 05:59:13AM -0700, Guillaume Ranquet wrote:
> >> +#include <drm/drm_atomic_helper.h>
> >> +#include <drm/drm_bridge.h>
> >> +#include <drm/drm_crtc.h>
> >> +#include <drm/dp/drm_dp_helper.h>
> >> +#include <drm/drm_edid.h>
> >> +#include <drm/drm_of.h>
> >> +#include <drm/drm_panel.h>
> >> +#include <drm/drm_print.h>
> >> +#include <drm/drm_probe_helper.h>
> >> +#include <linux/arm-smccc.h>
> >> +#include <linux/clk.h>
> >> +#include <linux/delay.h>
> >> +#include <linux/errno.h>
> >> +#include <linux/kernel.h>
> >> +#include <linux/mfd/syscon.h>
> >> +#include <linux/nvmem-consumer.h>
> >> +#include <linux/of.h>
> >> +#include <linux/of_irq.h>
> >> +#include <linux/of_platform.h>
> >> +#include <linux/phy/phy.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/pm_runtime.h>
> >> +#include <linux/regmap.h>
> >> +#include <sound/hdmi-codec.h>
> >> +#include <video/videomode.h>
> >> +
> >> +#include "mtk_dp_reg.h"
> >> +
> >> +#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
> >> +#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
> >> +
> >> +//TODO: platform/device data or dts?
> >
> >DTS :)
> 
> It's probably going to be a platform_data struct for v10...
> If I have time, I'll change it to a dts property for v10.

I can't really imagine a case where we would need platform_data
nowadays. If you have a device tree, then it should be part of the
binding.

What issue would you like to address by using a platform_data?

> >> +static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
> >> +{
> >> +	return connector_status_connected;
> >> +}
> >
> >I'm not quite sure what's going on there. You seem to have some support
> >for HPD interrupts above, but you always report the display as
> >connected?
> >
> >I'd assume that either you don't have HPD support and then always report
> >it as connected, or you have HPD support and report the current status
> >in detect, but that combination seems weird.
> 
> The HPD logic needs more work, some things have been broken when I split
> the driver into three patches eDP - DP - Audio
> The assumption at first was that eDP didn't need any HPD handling... but it
> seems I was wrong and the eDP driver needs to be reworked.

That can be made into a patch of its own if you prefer.

You first introduce the driver without status reporting (always
returning connected or unknown), and then add the needed bits for HPD.

However, that first patch shouldn't contain the interrupt plumbing and
so on, it's just confusing.

> >> +static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
> >> +				    struct drm_connector *connector)
> >> +{
> >> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> >> +	bool enabled = mtk_dp->enabled;
> >> +	struct edid *new_edid = NULL;
> >> +
> >> +	if (!enabled)
> >> +		drm_bridge_chain_pre_enable(bridge);
> >> +
> >> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
> >> +	usleep_range(2000, 5000);
> >> +
> >> +	if (mtk_dp_plug_state(mtk_dp))
> >> +		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
> >> +
> >> +	if (!enabled)
> >> +		drm_bridge_chain_post_disable(bridge);
> >
> >Are you sure we can't get a mode set while get_edid is called?
> >
> >If we can, then you could end up disabling the device while it's being
> >powered on.
> 
> I'm a bit unsure, I need to spend more time in the drm stack to make sure.
> I'll get back to you when I have a definitive answer.

So, it looks like it's ok.

get_edid is your implementation of get_modes, which is called by
drm_helper_probe_single_connector_modes

https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/drm_probe_helper.c#L416

This is the standard implemantion of fill_modes, which is called
whenever the get_connector ioctl is called (or similar paths, like
drm_client_modeset_probe)

drm_helper_probe_single_connector_modes is under the assumption that the
mode_config.mutex is held though, and that the big lock. So it should be
serialized there.

Just for future proofing though, it would be better to use refcounting
there. Would runtime_pm work for you there?

> >> +static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
> >> +					  struct drm_display_mode *mode)
> >> +{
> >> +	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
> >> +
> >> +	drm_display_mode_to_videomode(mode, &timings->vm);
> >> +	timings->frame_rate = mode->clock * 1000 / mode->htotal / mode->vtotal;
> >
> >drm_mode_vrefresh()
> >
> >> +	timings->htotal = mode->htotal;
> >> +	timings->vtotal = mode->vtotal;
> >> +}
> >
> >It's not really clear to me why you need to duplicate drm_display_mode
> >here?
> >
> It's saved to be re-used in mtk_dp_set_msa().
> It's not ideal, I'll check if I can get the mode directly from mtk_dp_set_msa()

Yeah, it looks like mtk_dp_set_msa() uses fairly straightforward values,
this will be just as easy with drm_display_mode.

Maxime
Guillaume Ranquet May 19, 2022, 4:26 p.m. UTC | #3 
On Thu, 12 May 2022 09:44, Maxime Ripard <maxime@cerno.tech> wrote:
>Hi,
>
>On Wed, May 11, 2022 at 05:59:13AM -0700, Guillaume Ranquet wrote:
>> >> +#include <drm/drm_atomic_helper.h>
>> >> +#include <drm/drm_bridge.h>
>> >> +#include <drm/drm_crtc.h>
>> >> +#include <drm/dp/drm_dp_helper.h>
>> >> +#include <drm/drm_edid.h>
>> >> +#include <drm/drm_of.h>
>> >> +#include <drm/drm_panel.h>
>> >> +#include <drm/drm_print.h>
>> >> +#include <drm/drm_probe_helper.h>
>> >> +#include <linux/arm-smccc.h>
>> >> +#include <linux/clk.h>
>> >> +#include <linux/delay.h>
>> >> +#include <linux/errno.h>
>> >> +#include <linux/kernel.h>
>> >> +#include <linux/mfd/syscon.h>
>> >> +#include <linux/nvmem-consumer.h>
>> >> +#include <linux/of.h>
>> >> +#include <linux/of_irq.h>
>> >> +#include <linux/of_platform.h>
>> >> +#include <linux/phy/phy.h>
>> >> +#include <linux/platform_device.h>
>> >> +#include <linux/pm_runtime.h>
>> >> +#include <linux/regmap.h>
>> >> +#include <sound/hdmi-codec.h>
>> >> +#include <video/videomode.h>
>> >> +
>> >> +#include "mtk_dp_reg.h"
>> >> +
>> >> +#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
>> >> +#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
>> >> +
>> >> +//TODO: platform/device data or dts?
>> >
>> >DTS :)
>>
>> It's probably going to be a platform_data struct for v10...
>> If I have time, I'll change it to a dts property for v10.
>
>I can't really imagine a case where we would need platform_data
>nowadays. If you have a device tree, then it should be part of the
>binding.
>
>What issue would you like to address by using a platform_data?
>

Ok, I'll migrate to dt then. I didn't realize platform_data were depreciated.

Angelo wants the MAX_LINRATE and MAX_LANES defines to be configurable.
I imagined platform_data would be more appropriate as (per my understanding) the
limitation is associated with a specific SoC.

>> >> +static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
>> >> +{
>> >> +	return connector_status_connected;
>> >> +}
>> >
>> >I'm not quite sure what's going on there. You seem to have some support
>> >for HPD interrupts above, but you always report the display as
>> >connected?
>> >
>> >I'd assume that either you don't have HPD support and then always report
>> >it as connected, or you have HPD support and report the current status
>> >in detect, but that combination seems weird.
>>
>> The HPD logic needs more work, some things have been broken when I split
>> the driver into three patches eDP - DP - Audio
>> The assumption at first was that eDP didn't need any HPD handling... but it
>> seems I was wrong and the eDP driver needs to be reworked.
>
>That can be made into a patch of its own if you prefer.
>
>You first introduce the driver without status reporting (always
>returning connected or unknown), and then add the needed bits for HPD.
>
>However, that first patch shouldn't contain the interrupt plumbing and
>so on, it's just confusing.
>

After discussing a while with Mediatek, it appears that hot plug detection
needs to be handled even for eDP... (which is always connected).
So I'll revert to the split I made earlier in v8 where hot plug detection was
part of the eDP patch the addition of the External display port was a
trivial patch [1].

>> >> +static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
>> >> +				    struct drm_connector *connector)
>> >> +{
>> >> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
>> >> +	bool enabled = mtk_dp->enabled;
>> >> +	struct edid *new_edid = NULL;
>> >> +
>> >> +	if (!enabled)
>> >> +		drm_bridge_chain_pre_enable(bridge);
>> >> +
>> >> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
>> >> +	usleep_range(2000, 5000);
>> >> +
>> >> +	if (mtk_dp_plug_state(mtk_dp))
>> >> +		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
>> >> +
>> >> +	if (!enabled)
>> >> +		drm_bridge_chain_post_disable(bridge);
>> >
>> >Are you sure we can't get a mode set while get_edid is called?
>> >
>> >If we can, then you could end up disabling the device while it's being
>> >powered on.
>>
>> I'm a bit unsure, I need to spend more time in the drm stack to make sure.
>> I'll get back to you when I have a definitive answer.
>
>So, it looks like it's ok.
>
>get_edid is your implementation of get_modes, which is called by
>drm_helper_probe_single_connector_modes
>
>https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/drm_probe_helper.c#L416
>
>This is the standard implemantion of fill_modes, which is called
>whenever the get_connector ioctl is called (or similar paths, like
>drm_client_modeset_probe)
>
>drm_helper_probe_single_connector_modes is under the assumption that the
>mode_config.mutex is held though, and that the big lock. So it should be
>serialized there.
>
>Just for future proofing though, it would be better to use refcounting
>there. Would runtime_pm work for you there?
>

Thx for looking into this for me.
Not sure runtime_pm works here as it would only refcount if compiled
with CONFIG_PM?
I'd rather use the enabled field as a refcounter instead of a boolean.

Unless I'm totally missing your point?

Thx,
Guillaume.

>> >> +static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
>> >> +					  struct drm_display_mode *mode)
>> >> +{
>> >> +	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
>> >> +
>> >> +	drm_display_mode_to_videomode(mode, &timings->vm);
>> >> +	timings->frame_rate = mode->clock * 1000 / mode->htotal / mode->vtotal;
>> >
>> >drm_mode_vrefresh()
>> >
>> >> +	timings->htotal = mode->htotal;
>> >> +	timings->vtotal = mode->vtotal;
>> >> +}
>> >
>> >It's not really clear to me why you need to duplicate drm_display_mode
>> >here?
>> >
>> It's saved to be re-used in mtk_dp_set_msa().
>> It's not ideal, I'll check if I can get the mode directly from mtk_dp_set_msa()
>
>Yeah, it looks like mtk_dp_set_msa() uses fairly straightforward values,
>this will be just as easy with drm_display_mode.
>
>Maxime


[1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220218145437.18563-17-granquet@baylibre.com/
Maxime Ripard May 25, 2022, 9:44 a.m. UTC | #4 
On Thu, May 19, 2022 at 09:26:59AM -0700, Guillaume Ranquet wrote:
> On Thu, 12 May 2022 09:44, Maxime Ripard <maxime@cerno.tech> wrote:
> >Hi,
> >
> >On Wed, May 11, 2022 at 05:59:13AM -0700, Guillaume Ranquet wrote:
> >> >> +#include <drm/drm_atomic_helper.h>
> >> >> +#include <drm/drm_bridge.h>
> >> >> +#include <drm/drm_crtc.h>
> >> >> +#include <drm/dp/drm_dp_helper.h>
> >> >> +#include <drm/drm_edid.h>
> >> >> +#include <drm/drm_of.h>
> >> >> +#include <drm/drm_panel.h>
> >> >> +#include <drm/drm_print.h>
> >> >> +#include <drm/drm_probe_helper.h>
> >> >> +#include <linux/arm-smccc.h>
> >> >> +#include <linux/clk.h>
> >> >> +#include <linux/delay.h>
> >> >> +#include <linux/errno.h>
> >> >> +#include <linux/kernel.h>
> >> >> +#include <linux/mfd/syscon.h>
> >> >> +#include <linux/nvmem-consumer.h>
> >> >> +#include <linux/of.h>
> >> >> +#include <linux/of_irq.h>
> >> >> +#include <linux/of_platform.h>
> >> >> +#include <linux/phy/phy.h>
> >> >> +#include <linux/platform_device.h>
> >> >> +#include <linux/pm_runtime.h>
> >> >> +#include <linux/regmap.h>
> >> >> +#include <sound/hdmi-codec.h>
> >> >> +#include <video/videomode.h>
> >> >> +
> >> >> +#include "mtk_dp_reg.h"
> >> >> +
> >> >> +#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
> >> >> +#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
> >> >> +
> >> >> +//TODO: platform/device data or dts?
> >> >
> >> >DTS :)
> >>
> >> It's probably going to be a platform_data struct for v10...
> >> If I have time, I'll change it to a dts property for v10.
> >
> >I can't really imagine a case where we would need platform_data
> >nowadays. If you have a device tree, then it should be part of the
> >binding.
> >
> >What issue would you like to address by using a platform_data?
> >
> 
> Ok, I'll migrate to dt then. I didn't realize platform_data were depreciated.
> 
> Angelo wants the MAX_LINRATE and MAX_LANES defines to be configurable.
> I imagined platform_data would be more appropriate as (per my understanding) the
> limitation is associated with a specific SoC.

The entire device tree is nothing but a collection of data associated to
a specific SoC though :)

> >> >> +static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
> >> >> +				    struct drm_connector *connector)
> >> >> +{
> >> >> +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> >> >> +	bool enabled = mtk_dp->enabled;
> >> >> +	struct edid *new_edid = NULL;
> >> >> +
> >> >> +	if (!enabled)
> >> >> +		drm_bridge_chain_pre_enable(bridge);
> >> >> +
> >> >> +	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
> >> >> +	usleep_range(2000, 5000);
> >> >> +
> >> >> +	if (mtk_dp_plug_state(mtk_dp))
> >> >> +		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
> >> >> +
> >> >> +	if (!enabled)
> >> >> +		drm_bridge_chain_post_disable(bridge);
> >> >
> >> >Are you sure we can't get a mode set while get_edid is called?
> >> >
> >> >If we can, then you could end up disabling the device while it's being
> >> >powered on.
> >>
> >> I'm a bit unsure, I need to spend more time in the drm stack to make sure.
> >> I'll get back to you when I have a definitive answer.
> >
> >So, it looks like it's ok.
> >
> >get_edid is your implementation of get_modes, which is called by
> >drm_helper_probe_single_connector_modes
> >
> >https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/drm_probe_helper.c#L416
> >
> >This is the standard implemantion of fill_modes, which is called
> >whenever the get_connector ioctl is called (or similar paths, like
> >drm_client_modeset_probe)
> >
> >drm_helper_probe_single_connector_modes is under the assumption that the
> >mode_config.mutex is held though, and that the big lock. So it should be
> >serialized there.
> >
> >Just for future proofing though, it would be better to use refcounting
> >there. Would runtime_pm work for you there?
> >
> 
> Thx for looking into this for me.
> Not sure runtime_pm works here as it would only refcount if compiled
> with CONFIG_PM?

It should be enabled in most configurations these days, and you can
always depend on it in your Kconfig option.

> I'd rather use the enabled field as a refcounter instead of a boolean.

It's a bit more ad-hoc, but that would work too. Make sure to use a lock
or atomic operations though

Maxime
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
index 2976d21e9a34..03ffa9b896c3 100644
--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig
@@ -28,3 +28,11 @@  config DRM_MEDIATEK_HDMI
 	select PHY_MTK_HDMI
 	help
 	  DRM/KMS HDMI driver for Mediatek SoCs
+
+config MTK_DPTX_SUPPORT
+	tristate "DRM DPTX Support for Mediatek SoCs"
+	depends on DRM_MEDIATEK
+	select PHY_MTK_DP
+	select DRM_DP_HELPER
+	help
+	  DRM/KMS Display Port driver for Mediatek SoCs.
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 29098d7c8307..d86a6406055e 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -21,3 +21,5 @@  mediatek-drm-hdmi-objs := mtk_cec.o \
 			  mtk_hdmi_ddc.o
 
 obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mediatek-drm-hdmi.o
+
+obj-$(CONFIG_MTK_DPTX_SUPPORT) += mtk_dp.o
diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
new file mode 100644
index 000000000000..7cd8459cf719
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -0,0 +1,2221 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ * Copyright (c) 2021 BayLibre
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.h>
+#include <drm/dp/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/hdmi-codec.h>
+#include <video/videomode.h>
+
+#include "mtk_dp_reg.h"
+
+#define MTK_DP_AUX_WAIT_REPLY_COUNT 20
+#define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3
+
+//TODO: platform/device data or dts?
+#define MTK_DP_MAX_LANES 4
+#define MTK_DP_MAX_LINK_RATE MTK_DP_LINKRATE_HBR3
+
+#define MTK_DP_TBC_BUF_READ_START_ADDR 0x08
+
+#define MTK_DP_TRAIN_RETRY_LIMIT 8
+#define MTK_DP_TRAIN_MAX_ITERATIONS 5
+
+#define MTK_DP_AUX_WRITE_READ_WAIT_TIME_US 20
+
+#define MTK_DP_DP_VERSION_11 0x11
+
+enum mtk_dp_state {
+	MTK_DP_STATE_INITIAL,
+	MTK_DP_STATE_IDLE,
+	MTK_DP_STATE_PREPARE,
+	MTK_DP_STATE_NORMAL,
+};
+
+enum mtk_dp_train_state {
+	MTK_DP_TRAIN_STATE_STARTUP = 0,
+	MTK_DP_TRAIN_STATE_CHECKCAP,
+	MTK_DP_TRAIN_STATE_CHECKEDID,
+	MTK_DP_TRAIN_STATE_TRAINING_PRE,
+	MTK_DP_TRAIN_STATE_TRAINING,
+	MTK_DP_TRAIN_STATE_NORMAL,
+	MTK_DP_TRAIN_STATE_DPIDLE,
+};
+
+struct mtk_dp_timings {
+	struct videomode vm;
+
+	u16 htotal;
+	u16 vtotal;
+	u8 frame_rate;
+	u32 pix_rate_khz;
+};
+
+struct mtk_dp_train_info {
+	bool tps3;
+	bool tps4;
+	bool sink_ssc;
+	bool cable_plugged_in;
+	bool cable_state_change;
+	bool cr_done;
+	bool eq_done;
+
+	/* link_rate is in multiple of 0.27Gbps */
+	int link_rate;
+	int lane_count;
+
+	u8  irq_status;
+	int check_cap_count;
+};
+
+/* Same values as used by the DP Spec for MISC0 bits 1 and 2 */
+enum mtk_dp_color_format {
+	MTK_DP_COLOR_FORMAT_RGB_444 = 0,
+	MTK_DP_COLOR_FORMAT_YUV_422 = 1,
+	MTK_DP_COLOR_FORMAT_YUV_444 = 2,
+	MTK_DP_COLOR_FORMAT_YUV_420 = 3,
+	MTK_DP_COLOR_FORMAT_YONLY = 4,
+	MTK_DP_COLOR_FORMAT_RAW = 5,
+	MTK_DP_COLOR_FORMAT_RESERVED = 6,
+	MTK_DP_COLOR_FORMAT_DEFAULT = MTK_DP_COLOR_FORMAT_RGB_444,
+	MTK_DP_COLOR_FORMAT_UNKNOWN = 15,
+};
+
+/* Multiple of 0.27Gbps */
+enum mtk_dp_linkrate {
+	MTK_DP_LINKRATE_RBR = 0x6,
+	MTK_DP_LINKRATE_HBR = 0xA,
+	MTK_DP_LINKRATE_HBR2 = 0x14,
+	MTK_DP_LINKRATE_HBR25 = 0x19,
+	MTK_DP_LINKRATE_HBR3 = 0x1E,
+};
+
+/* Same values as used for DP Spec MISC0 bits 5,6,7 */
+enum mtk_dp_color_depth {
+	MTK_DP_COLOR_DEPTH_6BIT = 0,
+	MTK_DP_COLOR_DEPTH_8BIT = 1,
+	MTK_DP_COLOR_DEPTH_10BIT = 2,
+	MTK_DP_COLOR_DEPTH_12BIT = 3,
+	MTK_DP_COLOR_DEPTH_16BIT = 4,
+	MTK_DP_COLOR_DEPTH_UNKNOWN = 5,
+};
+
+struct mtk_dp_info {
+	enum mtk_dp_color_depth depth;
+	enum mtk_dp_color_format format;
+	struct mtk_dp_timings timings;
+};
+
+struct dp_cal_data {
+	unsigned int glb_bias_trim;
+	unsigned int clktx_impse;
+
+	//TODO: see above with MTK_DP_MAX_LANES, make it SoC specific
+	unsigned int ln_tx_impsel_pmos[MTK_DP_MAX_LANES];
+	unsigned int ln_tx_impsel_nmos[MTK_DP_MAX_LANES];
+};
+
+struct mtk_dp {
+	struct device *dev;
+	struct phy *phy;
+	struct dp_cal_data cal_data;
+
+	struct drm_device *drm_dev;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	struct drm_dp_aux aux;
+
+	/* Protects edid as it is used in both bridge ops and IRQ handler */
+	struct mutex edid_lock;
+	struct edid *edid;
+
+	u8 rx_cap[DP_RECEIVER_CAP_SIZE];
+
+	struct mtk_dp_info info;
+	enum mtk_dp_state state;
+
+	struct mtk_dp_train_info train_info;
+	enum mtk_dp_train_state train_state;
+	unsigned int input_fmt;
+
+	struct regmap *regs;
+	struct clk *dp_tx_clk;
+
+	bool enabled;
+
+	bool has_fec;
+	/* Protects the mtk_dp struct */
+	struct mutex dp_lock;
+
+	hdmi_codec_plugged_cb plugged_cb;
+	struct device *codec_dev;
+	u8 connector_eld[MAX_ELD_BYTES];
+	struct drm_connector *conn;
+};
+
+static struct mtk_dp *mtk_dp_from_bridge(struct drm_bridge *b)
+{
+	return container_of(b, struct mtk_dp, bridge);
+}
+
+static u32 mtk_dp_read(struct mtk_dp *mtk_dp, u32 offset)
+{
+	u32 read_val;
+	int ret;
+
+	ret = regmap_read(mtk_dp->regs, offset, &read_val);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to read register 0x%x: %d\n",
+			offset, ret);
+		return 0;
+	}
+
+	return read_val;
+}
+
+static int mtk_dp_write(struct mtk_dp *mtk_dp, u32 offset, u32 val)
+{
+	int ret;
+
+	ret = regmap_write(mtk_dp->regs, offset, val);
+	if (ret)
+		dev_err(mtk_dp->dev,
+			"Failed to write register 0x%x with value 0x%x: %d\n",
+			offset, val, ret);
+	return ret;
+}
+
+static int mtk_dp_update_bits(struct mtk_dp *mtk_dp, u32 offset, u32 val,
+			      u32 mask)
+{
+	int ret;
+
+	ret = regmap_update_bits(mtk_dp->regs, offset, mask, val);
+	if (ret)
+		dev_err(mtk_dp->dev,
+			"Failed to update register 0x%x with value 0x%x, mask 0x%x: %d\n",
+			offset, val, mask, ret);
+	return ret;
+}
+
+static int mtk_dp_bulk_16bit_write(struct mtk_dp *mtk_dp, u32 offset, u8 *buf,
+				   size_t length)
+{
+	int i;
+	int ret = 0;
+	int num_regs = (length + 1) / 2;
+
+	/* 2 bytes per register */
+	for (i = 0; i < num_regs; i++) {
+		u32 val = buf[i * 2] |
+			  (i * 2 + 1 < length ? buf[i * 2 + 1] << 8 : 0);
+
+		ret = mtk_dp_write(mtk_dp, offset + i * 4, val);
+		if (ret)
+			goto out;
+	}
+
+out:
+	return ret;
+}
+
+static unsigned long mtk_dp_sip_atf_call(unsigned int cmd, unsigned int para)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(MTK_DP_SIP_CONTROL_AARCH32, cmd, para, 0, 0, 0, 0, 0,
+		      &res);
+
+	pr_debug("[DPTX]%s cmd 0x%x, p1 0x%x, ret 0x%lx-0x%lx", __func__, cmd,
+		 para, res.a0, res.a1);
+	return res.a1;
+}
+
+static int mtk_dp_msa_bypass_disable(struct mtk_dp *mtk_dp)
+{
+	const u16 bits_to_set =
+		BIT(HTOTAL_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(VTOTAL_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(HSTART_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(VSTART_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(HWIDTH_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(VHEIGHT_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(HSP_SEL_DP_ENC0_P0_SHIFT) | BIT(HSW_SEL_DP_ENC0_P0_SHIFT) |
+		BIT(VSP_SEL_DP_ENC0_P0_SHIFT) | BIT(VSW_SEL_DP_ENC0_P0_SHIFT);
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, bits_to_set,
+			   bits_to_set);
+}
+
+#define MTK_UPD_BITS_OR_OUT(mtk_dp, offset, val, mask, ret, label) \
+	do {\
+		ret = mtk_dp_update_bits(mtk_dp, offset, val, mask); \
+		if (ret) \
+			goto label; \
+	} while (0)
+
+static int mtk_dp_set_msa(struct mtk_dp *mtk_dp)
+{
+	int ret;
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3010, timings->htotal,
+			    HTOTAL_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3018,
+			    timings->vm.hsync_len + timings->vm.hback_porch,
+			   HSTART_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3028,
+			    timings->vm.hsync_len << HSW_SW_DP_ENC0_P0_SHIFT,
+			   HSW_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3028, 0,
+			    HSP_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3020, timings->vm.hactive,
+			    HWIDTH_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3014, timings->vtotal,
+			    VTOTAL_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_301C,
+			    timings->vm.vsync_len + timings->vm.vback_porch,
+			   VSTART_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_302C,
+			    timings->vm.vsync_len << VSW_SW_DP_ENC0_P0_SHIFT,
+			   VSW_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_302C, 0,
+			    VSP_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3024, timings->vm.vactive,
+			    VHEIGHT_SW_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3064, timings->vm.hactive,
+			    HDE_NUM_LAST_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3154, timings->htotal,
+			    PGEN_HTOTAL_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3158,
+			    timings->vm.hfront_porch,
+			   PGEN_HSYNC_RISING_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_315C, timings->vm.hsync_len,
+			    PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3160,
+			    timings->vm.hback_porch + timings->vm.hsync_len,
+			   PGEN_HFDE_START_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3164, timings->vm.hactive,
+			    PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3168, timings->vtotal,
+			    PGEN_VTOTAL_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_316C,
+			    timings->vm.vfront_porch,
+			   PGEN_VSYNC_RISING_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3170, timings->vm.vsync_len,
+			    PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3174,
+			    timings->vm.vback_porch + timings->vm.vsync_len,
+			   PGEN_VFDE_START_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3178, timings->vm.vactive,
+			    PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_set_color_format(struct mtk_dp *mtk_dp,
+				   enum mtk_dp_color_format color_format)
+{
+	u32 val;
+	int ret;
+
+	mtk_dp->info.format = color_format;
+
+	/* Update MISC0 */
+	ret = mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
+				 color_format << DP_TEST_COLOR_FORMAT_SHIFT,
+			   DP_TEST_COLOR_FORMAT_MASK);
+
+	if (ret)
+		return ret;
+
+	switch (color_format) {
+	case MTK_DP_COLOR_FORMAT_YUV_422:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422;
+		break;
+	case MTK_DP_COLOR_FORMAT_YUV_420:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420;
+		break;
+	case MTK_DP_COLOR_FORMAT_YONLY:
+	case MTK_DP_COLOR_FORMAT_RAW:
+	case MTK_DP_COLOR_FORMAT_RESERVED:
+	case MTK_DP_COLOR_FORMAT_UNKNOWN:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color format: %d\n",
+			 color_format);
+		fallthrough;
+	case MTK_DP_COLOR_FORMAT_RGB_444:
+	case MTK_DP_COLOR_FORMAT_YUV_444:
+		val = PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB;
+		break;
+	}
+
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
+			   PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_set_color_depth(struct mtk_dp *mtk_dp,
+				  enum mtk_dp_color_depth color_depth)
+{
+	int ret;
+	u32 val;
+
+	mtk_dp->info.depth = color_depth;
+
+	/* Update MISC0 */
+	ret = mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3034,
+				 color_depth << DP_TEST_BIT_DEPTH_SHIFT,
+			   DP_TEST_BIT_DEPTH_MASK);
+
+	if (ret)
+		return ret;
+
+	switch (color_depth) {
+	case MTK_DP_COLOR_DEPTH_6BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_8BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_10BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_12BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_16BIT:
+		val = VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT;
+		break;
+	case MTK_DP_COLOR_DEPTH_UNKNOWN:
+		drm_warn(mtk_dp->drm_dev, "Unsupported color depth %d\n",
+			 color_depth);
+		return -EINVAL;
+	}
+
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C, val,
+			   VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_mn_overwrite_disable(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
+			   VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_set_sram_read_start(struct mtk_dp *mtk_dp, u32 val)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_303C,
+			   val << SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT,
+			   SRAM_START_READ_THRD_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_setup_encoder(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_303C,
+			    BIT(VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT),
+			VIDEO_MN_GEN_EN_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3040,
+			    0x20 << SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT,
+			SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3364,
+			    0x20 << SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT,
+			SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3300,
+			    2 << VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT,
+			VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3364,
+			    4 << FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT,
+			FIFO_READ_START_POINT_DP_ENC1_P0_MASK, ret, out);
+	ret = mtk_dp_write(mtk_dp, MTK_DP_ENC1_P0_3368,
+			   1 << VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT |
+			1 << VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT |
+			BIT(SDP_DP13_EN_DP_ENC1_P0_SHIFT) |
+			1 << BS2BS_MODE_DP_ENC1_P0_SHIFT);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_pg_disable(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3038, 0,
+			    VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_31B0,
+			    4 << PGEN_PATTERN_SEL_SHIFT, PGEN_PATTERN_SEL_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static bool mtk_dp_plug_state(struct mtk_dp *mtk_dp)
+{
+	return !!(mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3414) &
+		  HPD_DB_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640,
+		     BIT(AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT) |
+		     BIT(AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT));
+}
+
+static int mtk_dp_aux_set_cmd(struct mtk_dp *mtk_dp, u8 cmd, u32 addr)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3644, cmd,
+			    MCU_REQUEST_COMMAND_AUX_TX_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3648, addr,
+			    MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_364C, addr >> 16,
+			    MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_aux_cmd_complete(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3650,
+			   BIT(MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT),
+			   MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK |
+				   PHY_FIFO_RST_AUX_TX_P0_MASK |
+				   MCU_REQ_DATA_NUM_AUX_TX_P0_MASK);
+}
+
+static int mtk_dp_aux_request_ready(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3630,
+			   BIT(AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT),
+			   AUX_TX_REQUEST_READY_AUX_TX_P0_MASK);
+}
+
+static void mtk_dp_aux_fill_write_fifo(struct mtk_dp *mtk_dp, u8 *buf,
+				       size_t length)
+{
+	mtk_dp_bulk_16bit_write(mtk_dp, MTK_DP_AUX_P0_3708, buf, length);
+}
+
+static int mtk_dp_aux_read_rx_fifo(struct mtk_dp *mtk_dp, u8 *buf,
+				   size_t length, int read_delay)
+{
+	int ret;
+	int read_pos;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3620, 0,
+			    AUX_RD_MODE_AUX_TX_P0_MASK, ret, out);
+
+	for (read_pos = 0; read_pos < length; read_pos++) {
+		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3620,
+				    BIT(AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT),
+				   AUX_RX_FIFO_READ_PULSE_TX_P0_MASK, ret, out);
+		usleep_range(read_delay, read_delay * 2);
+		buf[read_pos] =
+			(u8)(mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3620) &
+			     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK >>
+				     AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT);
+	}
+
+out:
+	return ret;
+}
+
+static int mtk_dp_aux_set_length(struct mtk_dp *mtk_dp, size_t length)
+{
+	int ret;
+
+	if (length > 0) {
+		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3650,
+				    (length - 1)
+				    << MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT,
+				    MCU_REQ_DATA_NUM_AUX_TX_P0_MASK, ret, out);
+		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_362C, 0,
+				    AUX_NO_LENGTH_AUX_TX_P0_MASK |
+				    AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+				    AUX_RESERVED_RW_0_AUX_TX_P0_MASK, ret, out);
+	} else {
+		MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_362C,
+				    BIT(AUX_NO_LENGTH_AUX_TX_P0_SHIFT),
+				    AUX_NO_LENGTH_AUX_TX_P0_MASK |
+				    AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+				    AUX_RESERVED_RW_0_AUX_TX_P0_MASK, ret, out);
+	}
+
+out:
+	return ret;
+}
+
+static int mtk_dp_aux_wait_for_completion(struct mtk_dp *mtk_dp, bool is_read)
+{
+	int wait_reply = MTK_DP_AUX_WAIT_REPLY_COUNT;
+
+	while (--wait_reply) {
+		u32 aux_irq_status;
+
+		if (is_read) {
+			u32 fifo_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3618);
+
+			if (fifo_status &
+			    (AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK |
+			     AUX_RX_FIFO_FULL_AUX_TX_P0_MASK)) {
+				return 0;
+			}
+		}
+
+		aux_irq_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3640);
+		if (aux_irq_status & AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK)
+			return 0;
+
+		if (aux_irq_status & AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK)
+			return -ETIMEDOUT;
+
+		usleep_range(100, 500);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int mtk_dp_aux_do_transfer(struct mtk_dp *mtk_dp, bool is_read, u8 cmd,
+				  u32 addr, u8 *buf, size_t length)
+{
+	int ret;
+	u32 reply_cmd;
+
+	if (is_read && (length > DP_AUX_MAX_PAYLOAD_BYTES ||
+			(cmd == DP_AUX_NATIVE_READ && !length)))
+		return -EINVAL;
+
+	if (!is_read) {
+		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
+					 BIT(AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT),
+				   AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK);
+
+		if (ret)
+			return ret;
+	}
+
+	mtk_dp_aux_cmd_complete(mtk_dp);
+	mtk_dp_aux_irq_clear(mtk_dp);
+	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+
+	mtk_dp_aux_set_cmd(mtk_dp, cmd, addr);
+	mtk_dp_aux_set_length(mtk_dp, length);
+
+	if (!is_read) {
+		if (length)
+			mtk_dp_aux_fill_write_fifo(mtk_dp, buf, length);
+
+		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3704,
+					 AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK,
+				   AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK);
+
+		if (ret)
+			return ret;
+	}
+
+	mtk_dp_aux_request_ready(mtk_dp);
+
+	ret = mtk_dp_aux_wait_for_completion(mtk_dp, is_read);
+
+	reply_cmd = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3624) &
+		    AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK;
+
+	if (ret || reply_cmd) {
+		u32 phy_status = mtk_dp_read(mtk_dp, MTK_DP_AUX_P0_3628) &
+				 AUX_RX_PHY_STATE_AUX_TX_P0_MASK;
+		if (phy_status != AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE) {
+			drm_err(mtk_dp->drm_dev,
+				"AUX Rx Aux hang, need SW reset\n");
+			return -EIO;
+		}
+
+		mtk_dp_aux_cmd_complete(mtk_dp);
+		mtk_dp_aux_irq_clear(mtk_dp);
+
+		usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+			     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+		return -ETIMEDOUT;
+	}
+
+	if (!length) {
+		ret = mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_362C, 0,
+					 AUX_NO_LENGTH_AUX_TX_P0_MASK |
+				   AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK |
+				   AUX_RESERVED_RW_0_AUX_TX_P0_MASK);
+
+		if (ret)
+			return ret;
+
+	} else if (is_read) {
+		int read_delay;
+
+		if (cmd == (DP_AUX_I2C_READ | DP_AUX_I2C_MOT) ||
+		    cmd == DP_AUX_I2C_READ)
+			read_delay = 500;
+		else
+			read_delay = 100;
+
+		mtk_dp_aux_read_rx_fifo(mtk_dp, buf, length, read_delay);
+	}
+
+	mtk_dp_aux_cmd_complete(mtk_dp);
+	mtk_dp_aux_irq_clear(mtk_dp);
+	usleep_range(MTK_DP_AUX_WRITE_READ_WAIT_TIME_US,
+		     MTK_DP_AUX_WRITE_READ_WAIT_TIME_US * 2);
+
+	return 0;
+}
+
+static bool mtk_dp_set_swing_pre_emphasis(struct mtk_dp *mtk_dp, int lane_num,
+					  int swing_val, int preemphasis)
+{
+	int ret;
+
+	u32 lane_shift = lane_num * DP_TX1_VOLT_SWING_SHIFT;
+
+	if (lane_num < 0 || lane_num > 3)
+		return false;
+
+	dev_dbg(mtk_dp->dev,
+		"link training swing_val= 0x%x, preemphasis = 0x%x\n",
+		swing_val, preemphasis);
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_SWING_EMP,
+			    swing_val << (DP_TX0_VOLT_SWING_SHIFT + lane_shift),
+			   DP_TX0_VOLT_SWING_MASK << lane_shift, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_SWING_EMP,
+			    preemphasis << (DP_TX0_PRE_EMPH_SHIFT + lane_shift),
+			   DP_TX0_PRE_EMPH_MASK << lane_shift, ret, out);
+
+out:
+	return !ret;
+}
+
+static int mtk_dp_reset_swing_pre_emphasis(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_SWING_EMP, 0,
+			   DP_TX0_VOLT_SWING_MASK | DP_TX1_VOLT_SWING_MASK |
+			   DP_TX2_VOLT_SWING_MASK |
+			   DP_TX3_VOLT_SWING_MASK |
+			   DP_TX0_PRE_EMPH_MASK | DP_TX1_PRE_EMPH_MASK |
+			   DP_TX2_PRE_EMPH_MASK | DP_TX3_PRE_EMPH_MASK);
+}
+
+static int mtk_dp_fec_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3540,
+			   enable ? BIT(FEC_EN_DP_TRANS_P0_SHIFT) : 0,
+			   FEC_EN_DP_TRANS_P0_MASK);
+}
+
+static int mtk_dp_hwirq_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	u32 val = 0;
+
+	if (!enable)
+		val = IRQ_MASK_DP_TRANS_P0_DISC_IRQ |
+		      IRQ_MASK_DP_TRANS_P0_CONN_IRQ |
+		      IRQ_MASK_DP_TRANS_P0_INT_IRQ;
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3418, val,
+			   IRQ_MASK_DP_TRANS_P0_MASK);
+}
+
+static int mtk_dp_initialize_settings(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_342C,
+			    XTAL_FREQ_DP_TRANS_P0_DEFAULT,
+			   XTAL_FREQ_DP_TRANS_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_3540,
+			    BIT(FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT),
+			   FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_31EC,
+			    BIT(AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT),
+			   AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
+			    SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_IRQ_MASK, IRQ_MASK_AUX_TOP_IRQ,
+			    IRQ_MASK_AUX_TOP_IRQ, ret, out);
+
+out:
+	return ret;
+}
+
+static void mtk_dp_initialize_hpd_detect_settings(struct mtk_dp *mtk_dp)
+{
+	// Debounce threshold
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   8 << HPD_DEB_THD_DP_TRANS_P0_SHIFT,
+			   HPD_DEB_THD_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   (HPD_INT_THD_DP_TRANS_P0_LOWER_500US |
+			    HPD_INT_THD_DP_TRANS_P0_UPPER_1100US)
+				   << HPD_INT_THD_DP_TRANS_P0_SHIFT,
+			   HPD_INT_THD_DP_TRANS_P0_MASK);
+
+	// Connect threshold 1.5ms + 5 x 0.1ms = 2ms
+	// Disconnect threshold 1.5ms + 5 x 0.1ms = 2ms
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3410,
+			   (5 << HPD_DISC_THD_DP_TRANS_P0_SHIFT) |
+				   (5 << HPD_CONN_THD_DP_TRANS_P0_SHIFT),
+			   HPD_DISC_THD_DP_TRANS_P0_MASK |
+				   HPD_CONN_THD_DP_TRANS_P0_MASK);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3430,
+			   HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT,
+			   HPD_INT_THD_ECO_DP_TRANS_P0_MASK);
+}
+
+static int mtk_dp_initialize_aux_settings(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	/* modify timeout threshold = 1595 [12 : 8] */
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_360C, 0x1595,
+			    AUX_TIMEOUT_THR_AUX_TX_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3658, 0,
+			    AUX_TX_OV_EN_AUX_TX_P0_MASK, ret, out);
+	/* 25 for 26M */
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3634,
+			    25 << AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT,
+			   AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK, ret, out);
+	/* 13 for 26M */
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_3614,
+			    13 << AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT,
+			   AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_AUX_P0_37C8,
+			    BIT(MTK_ATOP_EN_AUX_TX_P0_SHIFT),
+			   MTK_ATOP_EN_AUX_TX_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_initialize_digital_settings(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_304C, 0,
+			    VBID_VIDEO_MUTE_DP_ENC0_P0_MASK, ret, out);
+	mtk_dp_set_color_format(mtk_dp, MTK_DP_COLOR_FORMAT_RGB_444);
+	mtk_dp_set_color_depth(mtk_dp, MTK_DP_COLOR_DEPTH_8BIT);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC1_P0_3368,
+			    1 << BS2BS_MODE_DP_ENC1_P0_SHIFT,
+			   BS2BS_MODE_DP_ENC1_P0_MASK, ret, out);
+
+	/* dp tx encoder reset all sw */
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3004,
+			    BIT(DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT),
+			   DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK, ret, out);
+	usleep_range(1000, 5000);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3004, 0,
+			    DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_digital_sw_reset(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_340C,
+			    BIT(DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT),
+			   DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK, ret, out);
+	usleep_range(1000, 5000);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_340C, 0,
+			    DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_set_lanes(struct mtk_dp *mtk_dp, int lanes)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_35F0,
+			    lanes == 0 ? 0 : BIT(3), BIT(3) | BIT(2), ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_ENC0_P0_3000, lanes,
+			    LANE_NUM_DP_ENC0_P0_MASK, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_34A4,
+			    lanes << LANE_NUM_DP_TRANS_P0_SHIFT,
+			   LANE_NUM_DP_TRANS_P0_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int link_rate_to_mb_per_s(struct mtk_dp *mtk_dp,
+				 enum mtk_dp_linkrate linkrate)
+{
+	switch (linkrate) {
+	default:
+		drm_err(mtk_dp->drm_dev,
+			"Implementation error, unknown linkrate %d\n",
+			linkrate);
+		fallthrough;
+	case MTK_DP_LINKRATE_RBR:
+		return 1620;
+	case MTK_DP_LINKRATE_HBR:
+		return 2700;
+	case MTK_DP_LINKRATE_HBR2:
+		return 5400;
+	case MTK_DP_LINKRATE_HBR3:
+		return 8100;
+	}
+}
+
+static u32 check_cal_data_valid(u32 min, u32 max, u32 val, u32 default_val)
+{
+	if (val < min || val > max)
+		return default_val;
+
+	return val;
+}
+
+static int mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
+{
+	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
+	struct device *dev = mtk_dp->dev;
+	struct nvmem_cell *cell;
+	u32 *buf;
+	size_t len;
+
+	cell = nvmem_cell_get(dev, "dp_calibration_data");
+	if (IS_ERR(cell)) {
+		dev_err(dev,
+			"Error: Failed to get nvmem cell dp_calibration_data\n");
+		return PTR_ERR(cell);
+	}
+
+	buf = (u32 *)nvmem_cell_read(cell, &len);
+	nvmem_cell_put(cell);
+
+	if (IS_ERR(buf) || ((len / sizeof(u32)) != 4)) {
+		dev_err(dev,
+			"Error: Failed to read nvmem_cell_read fail len %ld\n",
+			(len / sizeof(u32)));
+		return PTR_ERR(buf);
+	}
+
+	cal_data->glb_bias_trim =
+		check_cal_data_valid(1, 0x1e, (buf[3] >> 27) & 0x1f, 0xf);
+	cal_data->clktx_impse =
+		check_cal_data_valid(1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[0] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[0] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[1] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[1] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[2] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[2] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_pmos[3] =
+		check_cal_data_valid(1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
+	cal_data->ln_tx_impsel_nmos[3] =
+		check_cal_data_valid(1, 0xe, buf[2] & 0xf, 0x8);
+
+	kfree(buf);
+
+	return 0;
+}
+
+static int mtk_dp_set_cal_data(struct mtk_dp *mtk_dp)
+{
+	int ret;
+	struct dp_cal_data *cal_data = &mtk_dp->cal_data;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_GLB_DPAUX_TX,
+			    cal_data->clktx_impse << 20, RG_CKM_PT0_CKTX_IMPSEL, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_GLB_BIAS_GEN_00,
+			    cal_data->glb_bias_trim << 16,
+			   RG_XTP_GLB_BIAS_INTR_CTRL, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_0,
+			    cal_data->ln_tx_impsel_pmos[0] << 12,
+			   RG_XTP_LN0_TX_IMPSEL_PMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_0,
+			    cal_data->ln_tx_impsel_nmos[0] << 16,
+			   RG_XTP_LN0_TX_IMPSEL_NMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_1,
+			    cal_data->ln_tx_impsel_pmos[1] << 12,
+			   RG_XTP_LN1_TX_IMPSEL_PMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_1,
+			    cal_data->ln_tx_impsel_nmos[1] << 16,
+			   RG_XTP_LN1_TX_IMPSEL_NMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_2,
+			    cal_data->ln_tx_impsel_pmos[2] << 12,
+			   RG_XTP_LN2_TX_IMPSEL_PMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_2,
+			    cal_data->ln_tx_impsel_nmos[2] << 16,
+			   RG_XTP_LN2_TX_IMPSEL_NMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_3,
+			    cal_data->ln_tx_impsel_pmos[3] << 12,
+			   RG_XTP_LN3_TX_IMPSEL_PMOS, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, DP_PHY_LANE_TX_3,
+			    cal_data->ln_tx_impsel_nmos[3] << 16,
+			   RG_XTP_LN3_TX_IMPSEL_NMOS, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_phy_configure(struct mtk_dp *mtk_dp,
+				enum mtk_dp_linkrate link_rate, int lane_count)
+{
+	int ret;
+	union phy_configure_opts phy_opts = {
+		.dp = {
+			.link_rate = link_rate_to_mb_per_s(mtk_dp, link_rate),
+			.set_rate = 1,
+			.lanes = lane_count,
+			.set_lanes = 1,
+			.ssc = mtk_dp->train_info.sink_ssc,
+		}
+		};
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE, DP_PWR_STATE_BANDGAP,
+			    DP_PWR_STATE_MASK, ret, out);
+
+	ret = phy_configure(mtk_dp->phy, &phy_opts);
+
+	if (ret)
+		goto out;
+
+	mtk_dp_set_cal_data(mtk_dp);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			    DP_PWR_STATE_BANDGAP_TPLL_LANE, DP_PWR_STATE_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_set_idle_pattern(struct mtk_dp *mtk_dp, bool enable)
+{
+	const u32 val = POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK |
+			POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK;
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3580, enable ? val : 0, val);
+}
+
+//TODO: check return value in callee
+static int mtk_dp_train_set_pattern(struct mtk_dp *mtk_dp, int pattern)
+{
+	if (pattern < 0 || pattern > 4) {
+		drm_err(mtk_dp->drm_dev,
+			"Implementation error, no such pattern %d\n", pattern);
+		return -EINVAL;
+	}
+
+	if (pattern == 1) /* TPS1 */
+		mtk_dp_set_idle_pattern(mtk_dp, false);
+
+	return mtk_dp_update_bits(mtk_dp,
+			   MTK_DP_TRANS_P0_3400,
+			   pattern ? BIT(pattern - 1) << PATTERN1_EN_DP_TRANS_P0_SHIFT : 0,
+			   PATTERN1_EN_DP_TRANS_P0_MASK | PATTERN2_EN_DP_TRANS_P0_MASK |
+			   PATTERN3_EN_DP_TRANS_P0_MASK |
+			   PATTERN4_EN_DP_TRANS_P0_MASK);
+}
+
+static int mtk_dp_set_enhanced_frame_mode(struct mtk_dp *mtk_dp, bool enable)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000,
+			   enable ? BIT(ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT) : 0,
+			   ENHANCED_FRAME_EN_DP_ENC0_P0_MASK);
+}
+
+static int mtk_dp_training_set_scramble(struct mtk_dp *mtk_dp, bool enable)
+{
+	return mtk_dp_update_bits(mtk_dp, MTK_DP_TRANS_P0_3404,
+			   enable ? DP_SCR_EN_DP_TRANS_P0_MASK : 0,
+			   DP_SCR_EN_DP_TRANS_P0_MASK);
+}
+
+static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
+{
+	u32 val = BIT(VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT);
+
+	if (enable)
+		val |= BIT(VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000, val,
+			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
+			   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
+
+	mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+}
+
+static int mtk_dp_power_enable(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, 0,
+			    SW_RST_B_PHYD, ret, out);
+	usleep_range(10, 200);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE, SW_RST_B_PHYD,
+			    SW_RST_B_PHYD, ret, out);
+	MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TOP_PWR_STATE,
+			    DP_PWR_STATE_BANDGAP_TPLL,
+			   DP_PWR_STATE_MASK, ret, out);
+
+out:
+	return ret;
+}
+
+static int mtk_dp_power_disable(struct mtk_dp *mtk_dp)
+{
+	int ret;
+
+	ret = mtk_dp_write(mtk_dp, MTK_DP_TOP_PWR_STATE, 0);
+
+	if (ret)
+		goto out;
+
+	usleep_range(10, 200);
+	ret = mtk_dp_write(mtk_dp, MTK_DP_0034,
+			   DA_CKM_CKTX0_EN_FORCE_EN | DA_CKM_BIAS_LPF_EN_FORCE_VAL |
+		     DA_CKM_BIAS_EN_FORCE_VAL |
+		     DA_XTP_GLB_LDO_EN_FORCE_VAL |
+		     DA_XTP_GLB_AVD10_ON_FORCE_VAL);
+
+	if (ret)
+		goto out;
+
+	/* Disable RX */
+	ret = mtk_dp_write(mtk_dp, MTK_DP_1040, 0);
+
+	if (ret)
+		goto out;
+
+	ret = mtk_dp_write(mtk_dp, MTK_DP_TOP_MEM_PD,
+			   0x550 | BIT(FUSE_SEL_SHIFT) | BIT(MEM_ISO_EN_SHIFT));
+
+out:
+	return ret;
+}
+
+static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
+{
+	mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR2;
+	mtk_dp->train_info.lane_count = MTK_DP_MAX_LANES;
+	mtk_dp->train_info.irq_status = 0;
+	mtk_dp->train_info.cable_plugged_in = false;
+	mtk_dp->train_info.cable_state_change = false;
+	mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+	mtk_dp->state = MTK_DP_STATE_INITIAL;
+
+	mtk_dp->info.format = MTK_DP_COLOR_FORMAT_RGB_444;
+	mtk_dp->info.depth = MTK_DP_COLOR_DEPTH_8BIT;
+	memset(&mtk_dp->info.timings, 0, sizeof(struct mtk_dp_timings));
+	mtk_dp->info.timings.frame_rate = 60;
+
+	mtk_dp->has_fec = false;
+}
+
+static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
+{
+	u32 sram_read_start = MTK_DP_TBC_BUF_READ_START_ADDR;
+
+	if (mtk_dp->train_info.lane_count > 0) {
+		sram_read_start = min_t(u32,
+					MTK_DP_TBC_BUF_READ_START_ADDR,
+					mtk_dp->info.timings.vm.hactive /
+					(mtk_dp->train_info.lane_count * 4 * 2 * 2));
+		mtk_dp_set_sram_read_start(mtk_dp, sram_read_start);
+	}
+
+	mtk_dp_setup_encoder(mtk_dp);
+}
+
+static void mtk_dp_calculate_pixrate(struct mtk_dp *mtk_dp)
+{
+	int target_frame_rate = 60;
+	int target_pixel_clk;
+
+	if (mtk_dp->info.timings.frame_rate > 0) {
+		target_frame_rate = mtk_dp->info.timings.frame_rate;
+		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
+				   (int)mtk_dp->info.timings.vtotal *
+				   target_frame_rate;
+	} else if (mtk_dp->info.timings.pix_rate_khz > 0) {
+		target_pixel_clk = mtk_dp->info.timings.pix_rate_khz * 1000;
+	} else {
+		target_pixel_clk = (int)mtk_dp->info.timings.htotal *
+				   (int)mtk_dp->info.timings.vtotal *
+				   target_frame_rate;
+	}
+
+	if (target_pixel_clk > 0)
+		mtk_dp->info.timings.pix_rate_khz = target_pixel_clk / 1000;
+}
+
+static void mtk_dp_set_tx_out(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_msa_bypass_disable(mtk_dp);
+	mtk_dp_calculate_pixrate(mtk_dp);
+	mtk_dp_pg_disable(mtk_dp);
+	mtk_dp_setup_tu(mtk_dp);
+}
+
+static void mtk_dp_train_update_swing_pre(struct mtk_dp *mtk_dp, int lanes,
+					  u8 dpcd_adjust_req[2])
+{
+	int lane;
+
+	for (lane = 0; lane < lanes; ++lane) {
+		u8 val;
+		u8 swing;
+		u8 preemphasis;
+		int index = lane / 2;
+		int shift = lane % 2 ? DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : 0;
+
+		swing = (dpcd_adjust_req[index] >> shift) &
+			DP_ADJUST_VOLTAGE_SWING_LANE0_MASK;
+		preemphasis = ((dpcd_adjust_req[index] >> shift) &
+			       DP_ADJUST_PRE_EMPHASIS_LANE0_MASK) >>
+			      DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT;
+		val = swing << DP_TRAIN_VOLTAGE_SWING_SHIFT |
+		      preemphasis << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+		if (swing == DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
+			val |= DP_TRAIN_MAX_SWING_REACHED;
+		if (preemphasis == 3)
+			val |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+
+		mtk_dp_set_swing_pre_emphasis(mtk_dp, lane, swing, preemphasis);
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_LANE0_SET + lane,
+				   val);
+	}
+
+	/* Wait for the signal to be stable enough */
+	usleep_range(2000, 5000);
+}
+
+static void mtk_dp_read_link_status(struct mtk_dp *mtk_dp,
+				    u8 link_status[DP_LINK_STATUS_SIZE])
+{
+	drm_dp_dpcd_read(&mtk_dp->aux, DP_LANE0_1_STATUS, link_status,
+			 DP_LINK_STATUS_SIZE);
+}
+
+static int mtk_dp_train_flow(struct mtk_dp *mtk_dp, int target_link_rate,
+			     int target_lane_count)
+{
+	u8 link_status[DP_LINK_STATUS_SIZE] = {};
+	u8 lane_adjust[2] = {};
+	bool pass_tps1 = false;
+	bool pass_tps2_3 = false;
+	int train_retries;
+	int status_control;
+	int iteration_count;
+	u8 prev_lane_adjust;
+	u8 val;
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LINK_BW_SET, target_link_rate);
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
+			   target_lane_count | DP_LANE_COUNT_ENHANCED_FRAME_EN);
+
+	if (mtk_dp->train_info.sink_ssc)
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_DOWNSPREAD_CTRL,
+				   DP_SPREAD_AMP_0_5);
+
+	train_retries = 0;
+	status_control = 0;
+	iteration_count = 1;
+	prev_lane_adjust = 0xFF;
+
+	mtk_dp_set_lanes(mtk_dp, target_lane_count / 2);
+	mtk_dp_phy_configure(mtk_dp, target_link_rate, target_lane_count);
+
+	dev_dbg(mtk_dp->dev,
+		"Link train target_link_rate = 0x%x, target_lane_count = 0x%x\n",
+		target_link_rate, target_lane_count);
+
+	do {
+		train_retries++;
+		if (!mtk_dp->train_info.cable_plugged_in ||
+		    ((mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) !=
+		     0x0)) {
+			return -ENODEV;
+		}
+
+		if (mtk_dp->train_state < MTK_DP_TRAIN_STATE_TRAINING)
+			return -EAGAIN;
+
+		if (!pass_tps1) {
+			mtk_dp_training_set_scramble(mtk_dp, false);
+
+			if (status_control == 0) {
+				status_control = 1;
+				mtk_dp_train_set_pattern(mtk_dp, 1);
+				val = DP_LINK_SCRAMBLING_DISABLE |
+				      DP_TRAINING_PATTERN_1;
+				drm_dp_dpcd_writeb(&mtk_dp->aux,
+						   DP_TRAINING_PATTERN_SET,
+						   DP_LINK_SCRAMBLING_DISABLE |
+						   DP_TRAINING_PATTERN_1);
+				drm_dp_dpcd_read(&mtk_dp->aux,
+						 DP_ADJUST_REQUEST_LANE0_1,
+						 lane_adjust,
+						 sizeof(lane_adjust));
+				iteration_count++;
+
+				mtk_dp_train_update_swing_pre(mtk_dp,
+							      target_lane_count, lane_adjust);
+			}
+
+			drm_dp_link_train_clock_recovery_delay(&mtk_dp->aux,
+							       mtk_dp->rx_cap);
+			mtk_dp_read_link_status(mtk_dp, link_status);
+
+			if (drm_dp_clock_recovery_ok(link_status,
+						     target_lane_count)) {
+				mtk_dp->train_info.cr_done = true;
+				pass_tps1 = true;
+				train_retries = 0;
+				iteration_count = 1;
+				dev_dbg(mtk_dp->dev, "Link train CR pass\n");
+			} else if (prev_lane_adjust == link_status[4]) {
+				iteration_count++;
+				if (prev_lane_adjust &
+				    DP_ADJUST_VOLTAGE_SWING_LANE0_MASK)
+					break;
+			} else {
+				prev_lane_adjust = link_status[4];
+			}
+			dev_dbg(mtk_dp->dev, "Link train CQ fail\n");
+		} else if (pass_tps1 && !pass_tps2_3) {
+			if (status_control == 1) {
+				status_control = 2;
+				if (mtk_dp->train_info.tps4) {
+					mtk_dp_train_set_pattern(mtk_dp, 4);
+					val = DP_TRAINING_PATTERN_4;
+				} else if (mtk_dp->train_info.tps3) {
+					mtk_dp_train_set_pattern(mtk_dp, 3);
+					val = DP_LINK_SCRAMBLING_DISABLE |
+					      DP_TRAINING_PATTERN_3;
+				} else {
+					mtk_dp_train_set_pattern(mtk_dp, 2);
+					val = DP_LINK_SCRAMBLING_DISABLE |
+					      DP_TRAINING_PATTERN_2;
+				}
+				drm_dp_dpcd_writeb(&mtk_dp->aux,
+						   DP_TRAINING_PATTERN_SET,
+						   val);
+
+				drm_dp_dpcd_read(&mtk_dp->aux,
+						 DP_ADJUST_REQUEST_LANE0_1,
+						 lane_adjust,
+						 sizeof(lane_adjust));
+
+				iteration_count++;
+				mtk_dp_train_update_swing_pre(mtk_dp,
+							      target_lane_count, lane_adjust);
+			}
+
+			drm_dp_link_train_channel_eq_delay(&mtk_dp->aux,
+							   mtk_dp->rx_cap);
+
+			mtk_dp_read_link_status(mtk_dp, link_status);
+
+			if (!drm_dp_clock_recovery_ok(link_status,
+						      target_lane_count)) {
+				mtk_dp->train_info.cr_done = false;
+				mtk_dp->train_info.eq_done = false;
+				dev_dbg(mtk_dp->dev, "Link train EQ fail\n");
+				break;
+			}
+
+			if (drm_dp_channel_eq_ok(link_status,
+						 target_lane_count)) {
+				mtk_dp->train_info.eq_done = true;
+				pass_tps2_3 = true;
+				dev_dbg(mtk_dp->dev, "Link train EQ pass\n");
+				break;
+			}
+
+			if (prev_lane_adjust == link_status[4])
+				iteration_count++;
+			else
+				prev_lane_adjust = link_status[4];
+		}
+
+		drm_dp_dpcd_read(&mtk_dp->aux, DP_ADJUST_REQUEST_LANE0_1,
+				 lane_adjust, sizeof(lane_adjust));
+		mtk_dp_train_update_swing_pre(mtk_dp, target_lane_count,
+					      lane_adjust);
+	} while (train_retries < MTK_DP_TRAIN_RETRY_LIMIT &&
+		 iteration_count < MTK_DP_TRAIN_MAX_ITERATIONS);
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_TRAINING_PATTERN_SET,
+			   DP_TRAINING_PATTERN_DISABLE);
+	mtk_dp_train_set_pattern(mtk_dp, 0);
+
+	if (!pass_tps2_3)
+		return -ETIMEDOUT;
+
+	mtk_dp->train_info.link_rate = target_link_rate;
+	mtk_dp->train_info.lane_count = target_lane_count;
+
+	mtk_dp_training_set_scramble(mtk_dp, true);
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_LANE_COUNT_SET,
+			   target_lane_count |
+				   DP_LANE_COUNT_ENHANCED_FRAME_EN);
+	mtk_dp_set_enhanced_frame_mode(mtk_dp, true);
+
+	return 0;
+}
+
+static bool mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
+{
+	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
+	u8 val;
+	struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+	if (!mtk_dp_plug_state(mtk_dp))
+		return false;
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+	usleep_range(2000, 5000);
+
+	drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
+
+	memcpy(mtk_dp->rx_cap, buf, min(sizeof(mtk_dp->rx_cap), sizeof(buf)));
+	mtk_dp->rx_cap[DP_TRAINING_AUX_RD_INTERVAL] &= DP_TRAINING_AUX_RD_MASK;
+
+	train_info->link_rate =
+		min_t(int, MTK_DP_MAX_LINK_RATE, buf[DP_MAX_LINK_RATE]);
+	train_info->lane_count =
+		min_t(int, MTK_DP_MAX_LANES, drm_dp_max_lane_count(buf));
+
+	train_info->tps3 = drm_dp_tps3_supported(buf);
+	train_info->tps4 = drm_dp_tps4_supported(buf);
+
+	train_info->sink_ssc =
+		!!(buf[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5);
+
+	train_info->sink_ssc = false;
+
+	drm_dp_dpcd_readb(&mtk_dp->aux, DP_MSTM_CAP, &val);
+	if (val & DP_MST_CAP) {
+		/* Clear DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 */
+		drm_dp_dpcd_readb(&mtk_dp->aux,
+				  DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, &val);
+		if (val)
+			drm_dp_dpcd_writeb(&mtk_dp->aux,
+					   DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0,
+					   val);
+	}
+
+	return true;
+}
+
+static void mtk_dp_train_change_mode(struct mtk_dp *mtk_dp)
+{
+	phy_reset(mtk_dp->phy);
+	mtk_dp_reset_swing_pre_emphasis(mtk_dp);
+
+	usleep_range(2000, 5000);
+}
+
+static int mtk_dp_train_start(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+	int lane_count;
+	int link_rate;
+	int train_limit;
+	int max_link_rate;
+	int plug_wait;
+
+	for (plug_wait = 7; !mtk_dp_plug_state(mtk_dp) && plug_wait > 0;
+	     --plug_wait)
+		usleep_range(1000, 5000);
+	if (plug_wait == 0) {
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+		return -ENODEV;
+	}
+
+	link_rate = mtk_dp->rx_cap[1];
+	lane_count = mtk_dp->rx_cap[2] & 0x1F;
+
+	mtk_dp->train_info.link_rate = min(MTK_DP_MAX_LINK_RATE, link_rate);
+	mtk_dp->train_info.lane_count = min(MTK_DP_MAX_LANES, lane_count);
+	link_rate = mtk_dp->train_info.link_rate;
+	lane_count = mtk_dp->train_info.lane_count;
+
+	switch (link_rate) {
+	case MTK_DP_LINKRATE_RBR:
+	case MTK_DP_LINKRATE_HBR:
+	case MTK_DP_LINKRATE_HBR2:
+	case MTK_DP_LINKRATE_HBR25:
+	case MTK_DP_LINKRATE_HBR3:
+		break;
+	default:
+		mtk_dp->train_info.link_rate = MTK_DP_LINKRATE_HBR3;
+		break;
+	};
+
+	max_link_rate = link_rate;
+	for (train_limit = 6; train_limit > 0; train_limit--) {
+		mtk_dp->train_info.cr_done = false;
+		mtk_dp->train_info.eq_done = false;
+
+		mtk_dp_train_change_mode(mtk_dp);
+		ret = mtk_dp_train_flow(mtk_dp, link_rate, lane_count);
+		if (ret)
+			return ret;
+
+		if (!mtk_dp->train_info.cr_done) {
+			switch (link_rate) {
+			case MTK_DP_LINKRATE_RBR:
+				lane_count = lane_count / 2;
+				link_rate = max_link_rate;
+				if (lane_count == 0) {
+					mtk_dp->train_state =
+						MTK_DP_TRAIN_STATE_DPIDLE;
+					return -EIO;
+				}
+				break;
+			case MTK_DP_LINKRATE_HBR:
+				link_rate = MTK_DP_LINKRATE_RBR;
+				break;
+			case MTK_DP_LINKRATE_HBR2:
+				link_rate = MTK_DP_LINKRATE_HBR;
+				break;
+			case MTK_DP_LINKRATE_HBR3:
+				link_rate = MTK_DP_LINKRATE_HBR2;
+				break;
+			default:
+				return -EINVAL;
+			};
+		} else if (!mtk_dp->train_info.eq_done) {
+			if (lane_count == 0)
+				return -EIO;
+
+			lane_count /= 2;
+		} else {
+			break;
+		}
+	}
+
+	if (train_limit == 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int mtk_dp_train_handler(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+	int i = 50;
+
+	for (; ret && i; i--) {
+		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
+			continue;
+
+		switch (mtk_dp->train_state) {
+		case MTK_DP_TRAIN_STATE_STARTUP:
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
+			break;
+
+		case MTK_DP_TRAIN_STATE_CHECKCAP:
+			if (mtk_dp_parse_capabilities(mtk_dp)) {
+				mtk_dp->train_info.check_cap_count = 0;
+				mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKEDID;
+			} else {
+				mtk_dp->train_info.check_cap_count++;
+
+				if (mtk_dp->train_info.check_cap_count >
+					MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT) {
+					mtk_dp->train_info.check_cap_count = 0;
+					mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+					ret = -ETIMEDOUT;
+				}
+			}
+			break;
+
+		case MTK_DP_TRAIN_STATE_CHECKEDID:
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
+			break;
+
+		case MTK_DP_TRAIN_STATE_TRAINING_PRE:
+			mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
+			break;
+
+		case MTK_DP_TRAIN_STATE_TRAINING:
+			ret = mtk_dp_train_start(mtk_dp);
+			if (!ret) {
+				mtk_dp_video_mute(mtk_dp, true);
+				mtk_dp->train_state = MTK_DP_TRAIN_STATE_NORMAL;
+				mtk_dp_fec_enable(mtk_dp, mtk_dp->has_fec);
+			} else if (ret != -EAGAIN) {
+				mtk_dp->train_state = MTK_DP_TRAIN_STATE_DPIDLE;
+			}
+
+			ret = 0;
+			break;
+
+		case MTK_DP_TRAIN_STATE_NORMAL:
+			break;
+		case MTK_DP_TRAIN_STATE_DPIDLE:
+			break;
+		default:
+			break;
+		}
+	}
+
+	if (ret)
+		drm_err(mtk_dp->drm_dev, "Train handler failed %d\n", ret);
+
+	return ret;
+}
+
+static void mtk_dp_video_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	if (enable) {
+		mtk_dp_set_tx_out(mtk_dp);
+		mtk_dp_video_mute(mtk_dp, false);
+	} else {
+		mtk_dp_video_mute(mtk_dp, true);
+	}
+}
+
+static void mtk_dp_video_config(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_mn_overwrite_disable(mtk_dp);
+
+	mtk_dp_set_msa(mtk_dp);
+
+	mtk_dp_set_color_depth(mtk_dp, mtk_dp->info.depth);
+	mtk_dp_set_color_format(mtk_dp, mtk_dp->info.format);
+}
+
+static void mtk_dp_state_handler(struct mtk_dp *mtk_dp)
+{
+	switch (mtk_dp->state) {
+	case MTK_DP_STATE_INITIAL:
+		mtk_dp_video_mute(mtk_dp, true);
+		mtk_dp->state = MTK_DP_STATE_IDLE;
+		break;
+
+	case MTK_DP_STATE_IDLE:
+		if (mtk_dp->train_state == MTK_DP_TRAIN_STATE_NORMAL)
+			mtk_dp->state = MTK_DP_STATE_PREPARE;
+		break;
+
+	case MTK_DP_STATE_PREPARE:
+		mtk_dp_video_config(mtk_dp);
+		mtk_dp_video_enable(mtk_dp, true);
+
+		mtk_dp->state = MTK_DP_STATE_NORMAL;
+		break;
+
+	case MTK_DP_STATE_NORMAL:
+		if (mtk_dp->train_state != MTK_DP_TRAIN_STATE_NORMAL) {
+			mtk_dp_video_mute(mtk_dp, true);
+			mtk_dp->state = MTK_DP_STATE_IDLE;
+		}
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void mtk_dp_init_port(struct mtk_dp *mtk_dp)
+{
+	mtk_dp_set_idle_pattern(mtk_dp, true);
+	mtk_dp_initialize_priv_data(mtk_dp);
+
+	mtk_dp_initialize_settings(mtk_dp);
+	mtk_dp_initialize_aux_settings(mtk_dp);
+	mtk_dp_initialize_digital_settings(mtk_dp);
+	mtk_dp_update_bits(mtk_dp, MTK_DP_AUX_P0_3690,
+			   BIT(RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT),
+			   RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK);
+	mtk_dp_initialize_hpd_detect_settings(mtk_dp);
+
+	mtk_dp_digital_sw_reset(mtk_dp);
+}
+
+static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
+			   struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret = 0;
+	void __iomem *base;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	mtk_dp->regs = syscon_node_to_regmap(dev->of_node);
+	if (IS_ERR(mtk_dp->regs))
+		return PTR_ERR(mtk_dp->regs);
+
+	//TODO: optional clock?
+	mtk_dp->dp_tx_clk = devm_clk_get(dev, "faxi");
+	if (IS_ERR(mtk_dp->dp_tx_clk)) {
+		ret = PTR_ERR(mtk_dp->dp_tx_clk);
+		dev_info(dev, "Failed to get dptx clock: %d\n", ret);
+		mtk_dp->dp_tx_clk = NULL;
+	}
+
+	return 0;
+}
+
+static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
+{
+	return connector_status_connected;
+}
+
+static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
+				    struct drm_connector *connector)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	bool enabled = mtk_dp->enabled;
+	struct edid *new_edid = NULL;
+
+	if (!enabled)
+		drm_bridge_chain_pre_enable(bridge);
+
+	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+	usleep_range(2000, 5000);
+
+	if (mtk_dp_plug_state(mtk_dp))
+		new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
+
+	if (!enabled)
+		drm_bridge_chain_post_disable(bridge);
+
+	mutex_lock(&mtk_dp->edid_lock);
+	kfree(mtk_dp->edid);
+	mtk_dp->edid = NULL;
+
+	if (!new_edid) {
+		mutex_unlock(&mtk_dp->edid_lock);
+		return NULL;
+	}
+
+	mtk_dp->edid = drm_edid_duplicate(new_edid);
+	mutex_unlock(&mtk_dp->edid_lock);
+
+	return new_edid;
+}
+
+static ssize_t mtk_dp_aux_transfer(struct drm_dp_aux *mtk_aux,
+				   struct drm_dp_aux_msg *msg)
+{
+	struct mtk_dp *mtk_dp;
+	bool is_read;
+	u8 request;
+	size_t accessed_bytes = 0;
+	int retry = 3, ret = 0;
+
+	mtk_dp = container_of(mtk_aux, struct mtk_dp, aux);
+
+	if (!mtk_dp->train_info.cable_plugged_in ||
+	    mtk_dp->train_info.irq_status & MTK_DP_HPD_DISCONNECT) {
+		mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKCAP;
+		ret = -EAGAIN;
+		goto err;
+	}
+
+	switch (msg->request) {
+	case DP_AUX_I2C_MOT:
+	case DP_AUX_I2C_WRITE:
+	case DP_AUX_NATIVE_WRITE:
+	case DP_AUX_I2C_WRITE_STATUS_UPDATE:
+	case DP_AUX_I2C_WRITE_STATUS_UPDATE | DP_AUX_I2C_MOT:
+		request = msg->request & ~DP_AUX_I2C_WRITE_STATUS_UPDATE;
+		is_read = false;
+		break;
+	case DP_AUX_I2C_READ:
+	case DP_AUX_NATIVE_READ:
+	case DP_AUX_I2C_READ | DP_AUX_I2C_MOT:
+		request = msg->request;
+		is_read = true;
+		break;
+	default:
+		drm_err(mtk_aux->drm_dev, "invalid aux cmd = %d\n",
+			msg->request);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (msg->size == 0) {
+		ret = mtk_dp_aux_do_transfer(mtk_dp, is_read, request,
+					     msg->address + accessed_bytes,
+					     msg->buffer + accessed_bytes, 0);
+	} else {
+		while (accessed_bytes < msg->size) {
+			size_t to_access =
+				min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES,
+				      msg->size - accessed_bytes);
+			while (retry--) {
+				ret = mtk_dp_aux_do_transfer(mtk_dp,
+							     is_read, request,
+							     msg->address + accessed_bytes,
+							     msg->buffer + accessed_bytes,
+							     to_access);
+				if (ret == 0)
+					break;
+				usleep_range(50, 100);
+			}
+			if (!retry || ret) {
+				drm_info(mtk_dp->drm_dev,
+					 "Failed to do AUX transfer: %d\n",
+					 ret);
+				break;
+			}
+			accessed_bytes += to_access;
+		}
+	}
+err:
+	if (ret) {
+		msg->reply = DP_AUX_NATIVE_REPLY_NACK | DP_AUX_I2C_REPLY_NACK;
+		return ret;
+	}
+
+	msg->reply = DP_AUX_NATIVE_REPLY_ACK | DP_AUX_I2C_REPLY_ACK;
+	return msg->size;
+}
+
+static void mtk_dp_poweroff(struct mtk_dp *mtk_dp)
+{
+	mutex_lock(&mtk_dp->dp_lock);
+
+	mtk_dp_hwirq_enable(mtk_dp, false);
+	mtk_dp_power_disable(mtk_dp);
+	phy_exit(mtk_dp->phy);
+	clk_disable_unprepare(mtk_dp->dp_tx_clk);
+
+	mutex_unlock(&mtk_dp->dp_lock);
+}
+
+static int mtk_dp_poweron(struct mtk_dp *mtk_dp)
+{
+	int ret = 0;
+
+	mutex_lock(&mtk_dp->dp_lock);
+
+	ret = clk_prepare_enable(mtk_dp->dp_tx_clk);
+	if (ret < 0) {
+		dev_err(mtk_dp->dev, "Fail to enable clock: %d\n", ret);
+		goto err;
+	}
+	ret = phy_init(mtk_dp->phy);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n", ret);
+		goto err_phy_init;
+	}
+	ret = mtk_dp_phy_configure(mtk_dp, MTK_DP_LINKRATE_RBR, 1);
+	if (ret) {
+		dev_err(mtk_dp->dev, "Failed to configure phy: %d\n", ret);
+		goto err_phy_config;
+	}
+
+	mtk_dp_init_port(mtk_dp);
+	mtk_dp_power_enable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, true);
+
+err_phy_config:
+	phy_exit(mtk_dp->phy);
+err_phy_init:
+	clk_disable_unprepare(mtk_dp->dp_tx_clk);
+err:
+	mutex_unlock(&mtk_dp->dp_lock);
+	return ret;
+}
+
+static int mtk_dp_bridge_attach(struct drm_bridge *bridge,
+				enum drm_bridge_attach_flags flags)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	int ret;
+
+	ret = mtk_dp_poweron(mtk_dp);
+	if (ret)
+		return ret;
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		dev_err(mtk_dp->dev, "Driver does not provide a connector!");
+		return -EINVAL;
+	}
+
+	if (mtk_dp->next_bridge) {
+		ret = drm_bridge_attach(bridge->encoder, mtk_dp->next_bridge,
+					&mtk_dp->bridge, flags);
+		if (ret) {
+			drm_warn(mtk_dp->drm_dev,
+				 "Failed to attach external bridge: %d\n", ret);
+			return ret;
+		}
+	}
+
+	mtk_dp->drm_dev = bridge->dev;
+
+	return 0;
+}
+
+static void mtk_dp_bridge_detach(struct drm_bridge *bridge)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+
+	mtk_dp->drm_dev = NULL;
+}
+
+static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
+					 struct drm_bridge_state *old_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+
+	mtk_dp_video_mute(mtk_dp, true);
+	mtk_dp->state = MTK_DP_STATE_IDLE;
+	mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+
+	mtk_dp->enabled = false;
+	msleep(100);
+	mtk_dp_poweroff(mtk_dp);
+}
+
+static void mtk_dp_parse_drm_mode_timings(struct mtk_dp *mtk_dp,
+					  struct drm_display_mode *mode)
+{
+	struct mtk_dp_timings *timings = &mtk_dp->info.timings;
+
+	drm_display_mode_to_videomode(mode, &timings->vm);
+	timings->frame_rate = mode->clock * 1000 / mode->htotal / mode->vtotal;
+	timings->htotal = mode->htotal;
+	timings->vtotal = mode->vtotal;
+}
+
+static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
+					struct drm_bridge_state *old_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	struct drm_connector_state *conn_state;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *crtc_state;
+
+	mtk_dp->conn = drm_atomic_get_new_connector_for_encoder(old_state->base.state,
+								bridge->encoder);
+	if (!mtk_dp->conn) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector is missing\n");
+		return;
+	}
+
+	memcpy(mtk_dp->connector_eld, mtk_dp->conn->eld, MAX_ELD_BYTES);
+
+	conn_state =
+		drm_atomic_get_new_connector_state(old_state->base.state, mtk_dp->conn);
+	if (!conn_state) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector state is missing\n");
+		return;
+	}
+
+	crtc = conn_state->crtc;
+	if (!crtc) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as connector state doesn't have a crtc\n");
+		return;
+	}
+
+	crtc_state = drm_atomic_get_new_crtc_state(old_state->base.state, crtc);
+	if (!crtc_state) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as crtc state is missing\n");
+		return;
+	}
+
+	mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state->adjusted_mode);
+	if (!mtk_dp_parse_capabilities(mtk_dp)) {
+		drm_err(mtk_dp->drm_dev,
+			"Can't enable bridge as nothing is plugged in\n");
+		return;
+	}
+
+	/* Training */
+	mtk_dp_train_handler(mtk_dp);
+	mtk_dp_state_handler(mtk_dp);
+	mtk_dp->enabled = true;
+}
+
+static enum drm_mode_status
+mtk_dp_bridge_mode_valid(struct drm_bridge *bridge,
+			 const struct drm_display_info *info,
+			 const struct drm_display_mode *mode)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	u32 rx_linkrate = (u32)mtk_dp->train_info.link_rate * 27000;
+	u32 bpp = info->color_formats & DRM_COLOR_FORMAT_YCBCR422 ? 16 : 24;
+
+	if (rx_linkrate * mtk_dp->train_info.lane_count < mode->clock * bpp / 8)
+		return MODE_CLOCK_HIGH;
+
+	if (mode->clock > 600000)
+		return MODE_CLOCK_HIGH;
+
+	//TODO: explain magic number: 62?
+	if ((mode->clock * 1000) / (mode->htotal * mode->vtotal) > 62)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static u32 *mtk_dp_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+						     struct drm_bridge_state *bridge_state,
+						     struct drm_crtc_state *crtc_state,
+						     struct drm_connector_state *conn_state,
+						     unsigned int *num_output_fmts)
+{
+	u32 *output_fmts;
+
+	*num_output_fmts = 0;
+	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
+	if (!output_fmts)
+		return NULL;
+	*num_output_fmts = 1;
+	output_fmts[0] = MEDIA_BUS_FMT_FIXED;
+	return output_fmts;
+}
+
+static const u32 mt8195_input_fmts[] = {
+	MEDIA_BUS_FMT_RGB888_1X24,
+	MEDIA_BUS_FMT_YUV8_1X24,
+	MEDIA_BUS_FMT_YUYV8_1X16,
+};
+
+static u32 *mtk_dp_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+						    struct drm_bridge_state *bridge_state,
+						    struct drm_crtc_state *crtc_state,
+						    struct drm_connector_state *conn_state,
+						    u32 output_fmt,
+						    unsigned int *num_input_fmts)
+{
+	u32 *input_fmts;
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+	struct drm_display_info *display_info =
+		&conn_state->connector->display_info;
+	u32 rx_linkrate = (u32)mtk_dp->train_info.link_rate * 27000;
+
+	*num_input_fmts = 0;
+
+	if (((rx_linkrate * mtk_dp->train_info.lane_count) <
+	     (mode->clock * 24 / 8)) &&
+	    ((rx_linkrate * mtk_dp->train_info.lane_count) >
+	     (mode->clock * 16 / 8)) &&
+	    (display_info->color_formats & DRM_COLOR_FORMAT_YCBCR422)) {
+		input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
+		if (!input_fmts)
+			return NULL;
+
+		*num_input_fmts = 1;
+		input_fmts[0] = MEDIA_BUS_FMT_YUYV8_1X16;
+	} else {
+		input_fmts = kmalloc(sizeof(mt8195_input_fmts), GFP_KERNEL);
+		if (!input_fmts)
+			return NULL;
+
+		*num_input_fmts = ARRAY_SIZE(mt8195_input_fmts);
+		memcpy(input_fmts, mt8195_input_fmts, sizeof(mt8195_input_fmts));
+	}
+
+	return input_fmts;
+}
+
+static int mtk_dp_bridge_atomic_check(struct drm_bridge *bridge,
+				      struct drm_bridge_state *bridge_state,
+				      struct drm_crtc_state *crtc_state,
+				      struct drm_connector_state *conn_state)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	unsigned int input_bus_format;
+
+	input_bus_format = bridge_state->input_bus_cfg.format;
+
+	dev_dbg(mtk_dp->dev, "input format 0x%04x, output format 0x%04x\n",
+		bridge_state->input_bus_cfg.format,
+		 bridge_state->output_bus_cfg.format);
+
+	mtk_dp->input_fmt = input_bus_format;
+	if (mtk_dp->input_fmt == MEDIA_BUS_FMT_YUYV8_1X16)
+		mtk_dp->info.format = MTK_DP_COLOR_FORMAT_YUV_422;
+	else
+		mtk_dp->info.format = MTK_DP_COLOR_FORMAT_RGB_444;
+
+	return 0;
+}
+
+static const struct drm_bridge_funcs mtk_dp_bridge_funcs = {
+	.atomic_check = mtk_dp_bridge_atomic_check,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_get_output_bus_fmts = mtk_dp_bridge_atomic_get_output_bus_fmts,
+	.atomic_get_input_bus_fmts = mtk_dp_bridge_atomic_get_input_bus_fmts,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.attach = mtk_dp_bridge_attach,
+	.detach = mtk_dp_bridge_detach,
+	.atomic_enable = mtk_dp_bridge_atomic_enable,
+	.atomic_disable = mtk_dp_bridge_atomic_disable,
+	.mode_valid = mtk_dp_bridge_mode_valid,
+	.get_edid = mtk_dp_get_edid,
+	.detect = mtk_dp_bdg_detect,
+};
+
+static int mtk_dp_probe(struct platform_device *pdev)
+{
+	struct mtk_dp *mtk_dp;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	mtk_dp = devm_kzalloc(dev, sizeof(*mtk_dp), GFP_KERNEL);
+	if (!mtk_dp)
+		return -ENOMEM;
+
+	mtk_dp->dev = dev;
+
+	mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
+	if (IS_ERR(mtk_dp->next_bridge))
+		return dev_err_probe(dev, PTR_ERR(mtk_dp->next_bridge), "Failed to get bridge\n");
+
+	ret = mtk_dp_dt_parse(mtk_dp, pdev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to parsed dt\n");
+
+	drm_dp_aux_init(&mtk_dp->aux);
+	mtk_dp->aux.name = "aux_mtk_dp";
+	mtk_dp->aux.transfer = mtk_dp_aux_transfer;
+
+	mutex_init(&mtk_dp->dp_lock);
+	mutex_init(&mtk_dp->edid_lock);
+
+	platform_set_drvdata(pdev, mtk_dp);
+
+	mtk_dp_get_calibration_data(mtk_dp);
+
+	mtk_dp->phy = devm_phy_get(dev, "dp");
+
+	if (IS_ERR(mtk_dp->phy))
+		return dev_err_probe(dev, PTR_ERR(mtk_dp->phy), "Failed to get phy\n");
+
+	mtk_dp->bridge.funcs = &mtk_dp_bridge_funcs;
+	mtk_dp->bridge.of_node = dev->of_node;
+	mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+
+	mtk_dp->bridge.ops = DRM_BRIDGE_OP_EDID;
+	drm_bridge_add(&mtk_dp->bridge);
+
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	return 0;
+}
+
+static int mtk_dp_remove(struct platform_device *pdev)
+{
+	struct mtk_dp *mtk_dp = platform_get_drvdata(pdev);
+
+	mtk_dp_video_mute(mtk_dp, true);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_dp_suspend(struct device *dev)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	if (mtk_dp_plug_state(mtk_dp)) {
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+		usleep_range(2000, 3000);
+	}
+
+	mtk_dp_power_disable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, false);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int mtk_dp_resume(struct device *dev)
+{
+	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+
+	mtk_dp_init_port(mtk_dp);
+	mtk_dp_power_enable(mtk_dp);
+	mtk_dp_hwirq_enable(mtk_dp, true);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mtk_dp_pm_ops, mtk_dp_suspend, mtk_dp_resume);
+
+static const struct of_device_id mtk_dp_of_match[] = {
+	{ .compatible = "mediatek,mt8195-edp-tx", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_dp_of_match);
+
+struct platform_driver mtk_dp_driver = {
+	.probe = mtk_dp_probe,
+	.remove = mtk_dp_remove,
+	.driver = {
+		.name = "mediatek-drm-dp",
+		.of_match_table = mtk_dp_of_match,
+		.pm = &mtk_dp_pm_ops,
+	},
+};
+
+MODULE_AUTHOR("Jason-JH.Lin <jason-jh.lin@mediatek.com>");
+MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com>");
+MODULE_DESCRIPTION("MediaTek DisplayPort Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
new file mode 100644
index 000000000000..c446eef18169
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
@@ -0,0 +1,568 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ * Copyright (c) 2021 BayLibre
+ */
+#ifndef _MTK_DP_REG_H_
+#define _MTK_DP_REG_H_
+
+#define MTK_DP_SIP_CONTROL_AARCH32 (BIT(0) | BIT(1) | BIT(5) | BIT(8) | BIT(10) | BIT(25) | BIT(31))
+#define MTK_DP_SIP_ATF_VIDEO_UNMUTE (BIT(5))
+#define MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE (BIT(0) | BIT(5))
+
+#define DP_PHY_GLB_BIAS_GEN_00 0
+#define RG_XTP_GLB_BIAS_INTR_CTRL GENMASK(20, 16)
+
+#define DP_PHY_GLB_DPAUX_TX (BIT(3))
+#define RG_CKM_PT0_CKTX_IMPSEL GENMASK(23, 20)
+
+#define DP_PHY_LANE_TX_0 (BIT(2) | BIT(8))
+#define RG_XTP_LN0_TX_IMPSEL_PMOS GENMASK(15, 12)
+#define RG_XTP_LN0_TX_IMPSEL_NMOS GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_1 (BIT(2) | BIT(9))
+#define RG_XTP_LN1_TX_IMPSEL_PMOS GENMASK(15, 12)
+#define RG_XTP_LN1_TX_IMPSEL_NMOS GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_2 (BIT(2) | BIT(8) | BIT(9))
+#define RG_XTP_LN2_TX_IMPSEL_PMOS GENMASK(15, 12)
+#define RG_XTP_LN2_TX_IMPSEL_NMOS GENMASK(19, 16)
+
+#define DP_PHY_LANE_TX_3 (BIT(2) | BIT(10))
+#define RG_XTP_LN3_TX_IMPSEL_PMOS GENMASK(15, 12)
+#define RG_XTP_LN3_TX_IMPSEL_NMOS GENMASK(19, 16)
+
+#define TOP_OFFSET (BIT(13))
+#define ENC0_OFFSET GENMASK(13, 12)
+#define ENC1_OFFSET (BIT(9) | BIT(12) | BIT(13))
+#define TRANS_OFFSET (BIT(10) | BIT(12) | BIT(13))
+#define AUX_OFFSET (BIT(9) | BIT(10) | BIT(12) | BIT(13))
+#define SEC_OFFSET (BIT(14))
+
+#define MTK_DP_HPD_DISCONNECT BIT(1)
+#define MTK_DP_HPD_CONNECT BIT(2)
+#define MTK_DP_HPD_INTERRUPT BIT(3)
+
+#define MTK_DP_0034 (BIT(2) | BIT(4) | BIT(5))
+#define DA_XTP_GLB_CKDET_EN_FORCE_VAL BIT(15)
+#define DA_XTP_GLB_CKDET_EN_FORCE_EN BIT(14)
+#define DA_CKM_INTCKTX_EN_FORCE_VAL BIT(13)
+#define DA_CKM_INTCKTX_EN_FORCE_EN BIT(12)
+#define DA_CKM_CKTX0_EN_FORCE_VAL BIT(11)
+#define DA_CKM_CKTX0_EN_FORCE_EN BIT(10)
+#define DA_CKM_XTAL_CK_FORCE_VAL BIT(9)
+#define DA_CKM_XTAL_CK_FORCE_EN BIT(8)
+#define DA_CKM_BIAS_LPF_EN_FORCE_VAL BIT(7)
+#define DA_CKM_BIAS_LPF_EN_FORCE_EN BIT(6)
+#define DA_CKM_BIAS_EN_FORCE_VAL BIT(5)
+#define DA_CKM_BIAS_EN_FORCE_EN BIT(4)
+#define DA_XTP_GLB_AVD10_ON_FORCE_VAL BIT(3)
+#define DA_XTP_GLB_AVD10_ON_FORCE BIT(2)
+#define DA_XTP_GLB_LDO_EN_FORCE_VAL BIT(1)
+#define DA_XTP_GLB_LDO_EN_FORCE_EN BIT(0)
+
+#define MTK_DP_1040 (BIT(6) | BIT(12))
+#define RG_DPAUX_RX_VALID_DEGLITCH_EN BIT(2)
+#define RG_XTP_GLB_CKDET_EN BIT(1)
+#define RG_DPAUX_RX_EN BIT(0)
+
+#define MTK_DP_ENC0_P0_3000 (ENC0_OFFSET + 0x00)
+#define LANE_NUM_DP_ENC0_P0_MASK GENMASK(1, 0)
+#define VIDEO_MUTE_SW_DP_ENC0_P0_MASK (BIT(2))
+#define VIDEO_MUTE_SW_DP_ENC0_P0_SHIFT (BIT(1))
+#define VIDEO_MUTE_SEL_DP_ENC0_P0_MASK (BIT(3))
+#define VIDEO_MUTE_SEL_DP_ENC0_P0_SHIFT GENMASK(1, 0)
+#define ENHANCED_FRAME_EN_DP_ENC0_P0_MASK (BIT(4))
+#define ENHANCED_FRAME_EN_DP_ENC0_P0_SHIFT (BIT(2))
+
+#define MTK_DP_ENC0_P0_3004 (ENC0_OFFSET + 0x04)
+#define VIDEO_M_CODE_SEL_DP_ENC0_P0_MASK (BIT(8))
+#define VIDEO_M_CODE_SEL_DP_ENC0_P0_SHIFT (BIT(3))
+#define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_MASK (BIT(9))
+#define DP_TX_ENCODER_4P_RESET_SW_DP_ENC0_P0_SHIFT (BIT(0) | BIT(3))
+
+#define MTK_DP_ENC0_P0_3008 (ENC0_OFFSET + 0x08)
+#define VIDEO_M_CODE_SW_0_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_300C (ENC0_OFFSET + 0x0C)
+#define VIDEO_M_CODE_SW_1_DP_ENC0_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_3010 (ENC0_OFFSET + 0x10)
+#define HTOTAL_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3014 (ENC0_OFFSET + 0x14)
+#define VTOTAL_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3018 (ENC0_OFFSET + 0x18)
+#define HSTART_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_301C (ENC0_OFFSET + 0x1C)
+#define VSTART_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3020 (ENC0_OFFSET + 0x20)
+#define HWIDTH_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3024 (ENC0_OFFSET + 0x24)
+#define VHEIGHT_SW_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3028 (ENC0_OFFSET + 0x28)
+#define HSW_SW_DP_ENC0_P0_MASK GENMASK(14, 0)
+#define HSW_SW_DP_ENC0_P0_SHIFT 0
+#define HSP_SW_DP_ENC0_P0_MASK (BIT(15))
+
+#define MTK_DP_ENC0_P0_302C (ENC0_OFFSET + 0x2C)
+#define VSW_SW_DP_ENC0_P0_MASK GENMASK(14, 0)
+#define VSW_SW_DP_ENC0_P0_SHIFT 0
+#define VSP_SW_DP_ENC0_P0_MASK (BIT(15))
+
+#define MTK_DP_ENC0_P0_3030 (ENC0_OFFSET + 0x30)
+#define HTOTAL_SEL_DP_ENC0_P0_SHIFT 0
+#define VTOTAL_SEL_DP_ENC0_P0_SHIFT (BIT(0))
+#define HSTART_SEL_DP_ENC0_P0_SHIFT (BIT(1))
+#define VSTART_SEL_DP_ENC0_P0_SHIFT GENMASK(1, 0)
+#define HWIDTH_SEL_DP_ENC0_P0_SHIFT (BIT(2))
+#define VHEIGHT_SEL_DP_ENC0_P0_SHIFT (BIT(0) | BIT(2))
+#define HSP_SEL_DP_ENC0_P0_SHIFT GENMASK(2, 1)
+#define HSW_SEL_DP_ENC0_P0_SHIFT GENMASK(2, 0)
+#define VSP_SEL_DP_ENC0_P0_SHIFT (BIT(3))
+#define VSW_SEL_DP_ENC0_P0_SHIFT (BIT(0) | BIT(3))
+#define VBID_AUDIO_MUTE_FLAG_SW_DP_ENC0_P0_MASK (BIT(11))
+#define VBID_AUDIO_MUTE_SW_DP_ENC0_P0_SHIFT (BIT(0) | BIT(1) | BIT(3))
+#define VBID_AUDIO_MUTE_FLAG_SEL_DP_ENC0_P0_MASK (BIT(12))
+#define VBID_AUDIO_MUTE_SEL_DP_ENC0_P0_SHIFT GENMASK(3, 2)
+
+#define MTK_DP_ENC0_P0_3034 (ENC0_OFFSET + 0x34)
+
+#define MTK_DP_ENC0_P0_3038 (ENC0_OFFSET + 0x38)
+#define VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK (BIT(11))
+#define VIDEO_SOURCE_SEL_DP_ENC0_P0_SHIFT (BIT(0) | BIT(1) | BIT(3))
+
+#define MTK_DP_ENC0_P0_303C (ENC0_OFFSET + 0x3C)
+#define SRAM_START_READ_THRD_DP_ENC0_P0_MASK GENMASK(5, 0)
+#define SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT 0
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK GENMASK(10, 8)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT (BIT(3))
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_16BIT                                     \
+	(0 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_12BIT                                     \
+	(1 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_10BIT                                     \
+	(2 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_8BIT                                      \
+	(3 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_6BIT                                      \
+	(4 << VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_MASK GENMASK(14, 12)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT GENMASK(3, 2)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_RGB                                     \
+	(0 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR422                                \
+	(1 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+#define PIXEL_ENCODE_FORMAT_DP_ENC0_P0_YCBCR420                                \
+	(2 << PIXEL_ENCODE_FORMAT_DP_ENC0_P0_SHIFT)
+#define VIDEO_MN_GEN_EN_DP_ENC0_P0_MASK (BIT(15))
+#define VIDEO_MN_GEN_EN_DP_ENC0_P0_SHIFT GENMASK(3, 0)
+
+#define MTK_DP_ENC0_P0_3040 (ENC0_OFFSET + 0x40)
+#define SDP_DOWN_CNT_INIT_DP_ENC0_P0_MASK GENMASK(11, 0)
+#define SDP_DOWN_CNT_INIT_DP_ENC0_P0_SHIFT 0
+
+#define MTK_DP_ENC0_P0_3044 (ENC0_OFFSET + 0x44)
+#define VIDEO_N_CODE_0_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3048 (ENC0_OFFSET + 0x48)
+#define VIDEO_N_CODE_1_DP_ENC0_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_304C (ENC0_OFFSET + 0x4C)
+#define VBID_VIDEO_MUTE_DP_ENC0_P0_MASK (BIT(2))
+#define SDP_VSYNC_RISING_MASK_DP_ENC0_P0_MASK (BIT(8))
+
+#define MTK_DP_ENC0_P0_3050 (ENC0_OFFSET + 0x50)
+#define VIDEO_N_CODE_MN_GEN_0_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3054 (ENC0_OFFSET + 0x54)
+#define VIDEO_N_CODE_MN_GEN_1_DP_ENC0_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_3064 (ENC0_OFFSET + 0x64)
+#define HDE_NUM_LAST_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3088 (ENC0_OFFSET + 0x88)
+#define AU_EN_DP_ENC0_P0_MASK (BIT(6))
+#define AU_EN_DP_ENC0_P0_SHIFT GENMASK(2, 1)
+#define AUDIO_8CH_EN_DP_ENC0_P0_MASK (BIT(7))
+#define AUDIO_8CH_SEL_DP_ENC0_P0_MASK (BIT(8))
+#define AUDIO_2CH_EN_DP_ENC0_P0_MASK (BIT(14))
+#define AUDIO_2CH_SEL_DP_ENC0_P0_MASK (BIT(15))
+
+#define MTK_DP_ENC0_P0_308C (ENC0_OFFSET + 0x8C)
+#define CH_STATUS_0_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3090 (ENC0_OFFSET + 0x90)
+#define CH_STATUS_1_DP_ENC0_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_ENC0_P0_3094 (ENC0_OFFSET + 0x94)
+#define CH_STATUS_2_DP_ENC0_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_30A0 (ENC0_OFFSET + 0xA0)
+
+#define MTK_DP_ENC0_P0_30A4 (ENC0_OFFSET + 0xA4)
+#define AU_TS_CFG_DP_ENC0_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_ENC0_P0_30A8 (ENC0_OFFSET + 0xA8)
+
+#define MTK_DP_ENC0_P0_30AC (ENC0_OFFSET + 0xAC)
+
+#define MTK_DP_ENC0_P0_30B0 (ENC0_OFFSET + 0xB0)
+
+#define MTK_DP_ENC0_P0_30B4 (ENC0_OFFSET + 0xB4)
+#define ISRC_CFG_DP_ENC0_P0_MASK GENMASK(15, 8)
+#define ISRC_CFG_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC0_P0_30B8 (ENC0_OFFSET + 0xB8)
+
+#define MTK_DP_ENC0_P0_30BC (ENC0_OFFSET + 0xBC)
+#define ISRC_CONT_DP_ENC0_P0_MASK (BIT(0))
+#define ISRC_CONT_DP_ENC0_P0_SHIFT 0
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK GENMASK(10, 8)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT (BIT(3))
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_2                             \
+	(1 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_4                             \
+	(2 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_8                             \
+	(3 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2                             \
+	(5 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_4                             \
+	(6 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+#define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_8                             \
+	(7 << AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_SHIFT)
+
+#define MTK_DP_ENC0_P0_30D8 (ENC0_OFFSET + 0xD8)
+
+#define MTK_DP_ENC0_P0_312C (ENC0_OFFSET + 0x12C)
+#define ASP_HB2_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define ASP_HB3_DP_ENC0_P0_MASK GENMASK(15, 8)
+#define ASP_HB3_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC0_P0_3130 (ENC0_OFFSET + 0x130)
+
+#define MTK_DP_ENC0_P0_3138 (ENC0_OFFSET + 0x138)
+
+#define MTK_DP_ENC0_P0_3154 (ENC0_OFFSET + 0x154)
+#define PGEN_HTOTAL_DP_ENC0_P0_MASK GENMASK(13, 0)
+
+#define MTK_DP_ENC0_P0_3158 (ENC0_OFFSET + 0x158)
+#define PGEN_HSYNC_RISING_DP_ENC0_P0_MASK GENMASK(13, 0)
+
+#define MTK_DP_ENC0_P0_315C (ENC0_OFFSET + 0x15C)
+#define PGEN_HSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK GENMASK(13, 0)
+
+#define MTK_DP_ENC0_P0_3160 (ENC0_OFFSET + 0x160)
+#define PGEN_HFDE_START_DP_ENC0_P0_MASK GENMASK(13, 0)
+
+#define MTK_DP_ENC0_P0_3164 (ENC0_OFFSET + 0x164)
+#define PGEN_HFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK GENMASK(13, 0)
+
+#define MTK_DP_ENC0_P0_3168 (ENC0_OFFSET + 0x168)
+#define PGEN_VTOTAL_DP_ENC0_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_ENC0_P0_316C (ENC0_OFFSET + 0x16C)
+#define PGEN_VSYNC_RISING_DP_ENC0_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_ENC0_P0_3170 (ENC0_OFFSET + 0x170)
+#define PGEN_VSYNC_PULSE_WIDTH_DP_ENC0_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_ENC0_P0_3174 (ENC0_OFFSET + 0x174)
+#define PGEN_VFDE_START_DP_ENC0_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_ENC0_P0_3178 (ENC0_OFFSET + 0x178)
+#define PGEN_VFDE_ACTIVE_WIDTH_DP_ENC0_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_ENC0_P0_31B0 (ENC0_OFFSET + 0x1B0)
+#define PGEN_PATTERN_SEL_SHIFT (BIT(2))
+#define PGEN_PATTERN_SEL_MASK GENMASK(6, 4)
+
+#define MTK_DP_ENC0_P0_31C8 (ENC0_OFFSET + 0x1C8)
+#define VSC_EXT_VESA_HB0_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define VSC_EXT_VESA_HB1_DP_ENC0_P0_MASK GENMASK(15, 8)
+#define VSC_EXT_VESA_HB1_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC0_P0_31CC (ENC0_OFFSET + 0x1CC)
+#define VSC_EXT_VESA_HB2_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define VSC_EXT_VESA_HB2_DP_ENC0_P0_SHIFT 0
+#define VSC_EXT_VESA_HB3_DP_ENC0_P0_MASK GENMASK(15, 8)
+
+#define MTK_DP_ENC0_P0_31D0 (ENC0_OFFSET + 0x1D0)
+#define VSC_EXT_CEA_HB0_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define VSC_EXT_CEA_HB1_DP_ENC0_P0_MASK GENMASK(15, 8)
+#define VSC_EXT_CEA_HB1_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC0_P0_31D4 (ENC0_OFFSET + 0x1D4)
+#define VSC_EXT_CEA_HB2_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define VSC_EXT_CEA_HB2_DP_ENC0_P0_SHIFT 0
+#define VSC_EXT_CEA_HB3_DP_ENC0_P0_MASK GENMASK(15, 8)
+
+#define MTK_DP_ENC0_P0_31D8 (ENC0_OFFSET + 0x1D8)
+#define VSC_EXT_VESA_NUM_DP_ENC0_P0_MASK GENMASK(5, 0)
+#define VSC_EXT_VESA_NUM_DP_ENC0_P0_SHIFT 0
+#define VSC_EXT_CEA_NUM_DP_ENC0_P0_MASK GENMASK(13, 8)
+#define VSC_EXT_CEA_NUM_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC0_P0_31DC (ENC0_OFFSET + 0x1DC)
+#define HDR0_CFG_DP_ENC0_P0_MASK GENMASK(7, 0)
+#define HDR0_CFG_DP_ENC0_P0_SHIFT 0
+
+#define MTK_DP_ENC0_P0_31E8 (ENC0_OFFSET + 0x1E8)
+
+#define MTK_DP_ENC0_P0_31EC (ENC0_OFFSET + 0x1EC)
+#define AUDIO_CH_SRC_SEL_DP_ENC0_P0_MASK (BIT(4))
+#define AUDIO_CH_SRC_SEL_DP_ENC0_P0_SHIFT (BIT(2))
+#define ISRC1_HB3_DP_ENC0_P0_MASK GENMASK(15, 8)
+#define ISRC1_HB3_DP_ENC0_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC1_P0_3200 (ENC1_OFFSET + 0x00)
+
+#define MTK_DP_ENC1_P0_3280 (ENC1_OFFSET + 0x80)
+#define SDP_PACKET_TYPE_DP_ENC1_P0_MASK GENMASK(4, 0)
+#define SDP_PACKET_W_DP_ENC1_P0 (BIT(5))
+#define SDP_PACKET_W_DP_ENC1_P0_MASK (BIT(5))
+#define SDP_PACKET_W_DP_ENC1_P0_SHIFT (BIT(0) | BIT(2))
+
+#define MTK_DP_ENC1_P0_328C (ENC1_OFFSET + 0x8C)
+
+#define MTK_DP_ENC1_P0_3290 (ENC1_OFFSET + 0x90)
+
+#define MTK_DP_ENC1_P0_32A0 (ENC1_OFFSET + 0xA0)
+
+#define MTK_DP_ENC1_P0_32A4 (ENC1_OFFSET + 0xA4)
+
+#define MTK_DP_ENC1_P0_3300 (ENC1_OFFSET + 0x100)
+#define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_MASK GENMASK(9, 8)
+#define VIDEO_AFIFO_RDY_SEL_DP_ENC1_P0_SHIFT (BIT(3))
+
+#define MTK_DP_ENC1_P0_3304 (ENC1_OFFSET + 0x104)
+#define AU_PRTY_REGEN_DP_ENC1_P0_MASK (BIT(8))
+#define AU_CH_STS_REGEN_DP_ENC1_P0_MASK (BIT(9))
+#define AUDIO_SAMPLE_PRSENT_REGEN_DP_ENC1_P0_MASK (BIT(12))
+
+#define MTK_DP_ENC1_P0_3324 (ENC1_OFFSET + 0x124)
+#define AUDIO_SOURCE_MUX_DP_ENC1_P0_MASK GENMASK(9, 8)
+#define AUDIO_SOURCE_MUX_DP_ENC1_P0_SHIFT (BIT(3))
+#define AUDIO_SOURCE_MUX_DP_ENC1_P0_DPRX                                       \
+	(0 << AUDIO_SOURCE_MUX_DP_ENC1_P0_SHIFT)
+
+#define MTK_DP_ENC1_P0_3364 (ENC1_OFFSET + 0x164)
+#define SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_MASK GENMASK(11, 0)
+#define SDP_DOWN_CNT_INIT_IN_HBLANK_DP_ENC1_P0_SHIFT 0
+#define FIFO_READ_START_POINT_DP_ENC1_P0_MASK GENMASK(15, 12)
+#define FIFO_READ_START_POINT_DP_ENC1_P0_SHIFT GENMASK(3, 2)
+
+#define MTK_DP_ENC1_P0_3368 (ENC1_OFFSET + 0x168)
+#define VIDEO_SRAM_FIFO_CNT_RESET_SEL_DP_ENC1_P0_SHIFT 0
+#define VIDEO_STABLE_CNT_THRD_DP_ENC1_P0_SHIFT (BIT(2))
+#define SDP_DP13_EN_DP_ENC1_P0_SHIFT (BIT(3))
+#define BS2BS_MODE_DP_ENC1_P0_MASK GENMASK(13, 12)
+#define BS2BS_MODE_DP_ENC1_P0_SHIFT GENMASK(3, 2)
+
+#define MTK_DP_ENC1_P0_33F4 (ENC1_OFFSET + 0x1F4)
+
+#define MTK_DP_TRANS_P0_3400 (TRANS_OFFSET + 0)
+#define PATTERN1_EN_DP_TRANS_P0_MASK (BIT(12))
+#define PATTERN1_EN_DP_TRANS_P0_SHIFT GENMASK(3, 2)
+#define PATTERN2_EN_DP_TRANS_P0_MASK (BIT(13))
+#define PATTERN3_EN_DP_TRANS_P0_MASK (BIT(14))
+#define PATTERN4_EN_DP_TRANS_P0_MASK (BIT(15))
+
+#define MTK_DP_TRANS_P0_3404 (TRANS_OFFSET + 0x4)
+#define DP_SCR_EN_DP_TRANS_P0_MASK (BIT(0))
+
+#define MTK_DP_TRANS_P0_340C (TRANS_OFFSET + 0xC)
+#define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_MASK (BIT(13))
+#define DP_TX_TRANSMITTER_4P_RESET_SW_DP_TRANS_P0_SHIFT (BIT(0) | BIT(2) | BIT(3))
+
+#define MTK_DP_TRANS_P0_3410 (TRANS_OFFSET + 0x10)
+#define HPD_DEB_THD_DP_TRANS_P0_MASK GENMASK(3, 0)
+#define HPD_DEB_THD_DP_TRANS_P0_SHIFT 0
+#define HPD_INT_THD_DP_TRANS_P0_MASK GENMASK(7, 4)
+#define HPD_INT_THD_DP_TRANS_P0_SHIFT (BIT(2))
+#define HPD_INT_THD_DP_TRANS_P0_LOWER_500US (2 << HPD_INT_THD_DP_TRANS_P0_SHIFT)
+#define HPD_INT_THD_DP_TRANS_P0_UPPER_1100US                                   \
+	(2 << (HPD_INT_THD_DP_TRANS_P0_SHIFT + 2))
+#define HPD_DISC_THD_DP_TRANS_P0_MASK GENMASK(11, 8)
+#define HPD_DISC_THD_DP_TRANS_P0_SHIFT (BIT(3))
+#define HPD_CONN_THD_DP_TRANS_P0_MASK GENMASK(15, 12)
+#define HPD_CONN_THD_DP_TRANS_P0_SHIFT GENMASK(3, 2)
+
+#define MTK_DP_TRANS_P0_3414 (TRANS_OFFSET + 0x14)
+#define HPD_DB_DP_TRANS_P0_MASK (BIT(2))
+
+#define MTK_DP_TRANS_P0_3418 (TRANS_OFFSET + 0x18)
+#define IRQ_CLR_DP_TRANS_P0_MASK GENMASK(3, 0)
+#define IRQ_MASK_DP_TRANS_P0_MASK GENMASK(7, 4)
+#define IRQ_MASK_DP_TRANS_P0_SHIFT (BIT(2))
+#define IRQ_MASK_DP_TRANS_P0_DISC_IRQ (BIT(1) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+#define IRQ_MASK_DP_TRANS_P0_CONN_IRQ (BIT(2) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+#define IRQ_MASK_DP_TRANS_P0_INT_IRQ (BIT(3) << IRQ_MASK_DP_TRANS_P0_SHIFT)
+#define IRQ_STATUS_DP_TRANS_P0_MASK GENMASK(15, 12)
+#define IRQ_STATUS_DP_TRANS_P0_SHIFT GENMASK(3, 2)
+
+#define MTK_DP_TRANS_P0_342C (TRANS_OFFSET + 0x2C)
+#define XTAL_FREQ_DP_TRANS_P0_DEFAULT (BIT(0) | BIT(3) | BIT(5) | BIT(6))
+#define XTAL_FREQ_DP_TRANS_P0_MASK GENMASK(7, 0)
+
+#define MTK_DP_TRANS_P0_3430 (TRANS_OFFSET + 0x30)
+#define HPD_INT_THD_ECO_DP_TRANS_P0_MASK GENMASK(1, 0)
+#define HPD_INT_THD_ECO_DP_TRANS_P0_HIGH_BOUND_EXT BIT(1)
+
+#define MTK_DP_TRANS_P0_34A4 (TRANS_OFFSET + 0xA4)
+#define LANE_NUM_DP_TRANS_P0_MASK GENMASK(3, 2)
+#define LANE_NUM_DP_TRANS_P0_SHIFT (BIT(1))
+
+#define MTK_DP_TRANS_P0_3540 (TRANS_OFFSET + 0x140)
+#define FEC_EN_DP_TRANS_P0_MASK (BIT(0))
+#define FEC_EN_DP_TRANS_P0_SHIFT 0
+#define FEC_CLOCK_EN_MODE_DP_TRANS_P0_MASK (BIT(3))
+#define FEC_CLOCK_EN_MODE_DP_TRANS_P0_SHIFT GENMASK(1, 0)
+
+#define MTK_DP_TRANS_P0_3580 (TRANS_OFFSET + 0x180)
+#define POST_MISC_DATA_LANE0_OV_DP_TRANS_P0_MASK (BIT(8))
+#define POST_MISC_DATA_LANE1_OV_DP_TRANS_P0_MASK (BIT(9))
+#define POST_MISC_DATA_LANE2_OV_DP_TRANS_P0_MASK (BIT(10))
+#define POST_MISC_DATA_LANE3_OV_DP_TRANS_P0_MASK (BIT(11))
+
+#define MTK_DP_TRANS_P0_35C4 (TRANS_OFFSET + 0x1C4)
+#define SW_IRQ_MASK_DP_TRANS_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_TRANS_P0_35C8 (TRANS_OFFSET + 0x1C8)
+#define SW_IRQ_CLR_DP_TRANS_P0_MASK GENMASK(15, 0)
+
+#define SW_IRQ_STATUS_DP_TRANS_P0_MASK GENMASK(15, 0)
+#define SW_IRQ_STATUS_DP_TRANS_P0_SHIFT 0
+
+#define MTK_DP_TRANS_P0_35D0 (TRANS_OFFSET + 0x1D0)
+#define SW_IRQ_FINAL_STATUS_DP_TRANS_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_TRANS_P0_35F0 (TRANS_OFFSET + 0x1F0)
+
+#define MTK_DP_AUX_P0_360C (AUX_OFFSET + 0xC)
+#define AUX_TIMEOUT_THR_AUX_TX_P0_MASK GENMASK(12, 0)
+
+#define MTK_DP_AUX_P0_3614 (AUX_OFFSET + 0x14)
+#define AUX_RX_UI_CNT_THR_AUX_TX_P0_MASK GENMASK(6, 0)
+#define AUX_RX_UI_CNT_THR_AUX_TX_P0_SHIFT 0
+
+#define MTK_DP_AUX_P0_3618 (AUX_OFFSET + 0x18)
+#define AUX_RX_FIFO_FULL_AUX_TX_P0_MASK (BIT(9))
+#define AUX_RX_FIFO_WRITE_POINTER_AUX_TX_P0_MASK GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3620 (AUX_OFFSET + 0x20)
+#define AUX_RD_MODE_AUX_TX_P0_MASK (BIT(9))
+#define AUX_RX_FIFO_READ_PULSE_TX_P0_MASK (BIT(8))
+#define AUX_RX_FIFO_R_PULSE_TX_P0_SHIFT (BIT(3))
+#define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_MASK GENMASK(7, 0)
+#define AUX_RX_FIFO_READ_DATA_AUX_TX_P0_SHIFT 0
+
+#define MTK_DP_AUX_P0_3624 (AUX_OFFSET + 0x24)
+#define AUX_RX_REPLY_COMMAND_AUX_TX_P0_MASK GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3628 (AUX_OFFSET + 0x28)
+#define AUX_RX_PHY_STATE_AUX_TX_P0_MASK GENMASK(9, 0)
+#define AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT 0
+#define AUX_RX_PHY_STATE_AUX_TX_P0_RX_IDLE                                     \
+	(BIT(0) << AUX_RX_PHY_STATE_AUX_TX_P0_SHIFT)
+
+#define MTK_DP_AUX_P0_362C (AUX_OFFSET + 0x2C)
+#define AUX_NO_LENGTH_AUX_TX_P0_MASK (BIT(0))
+#define AUX_NO_LENGTH_AUX_TX_P0_SHIFT 0
+#define AUX_TX_AUXTX_OV_EN_AUX_TX_P0_MASK (BIT(1))
+#define AUX_RESERVED_RW_0_AUX_TX_P0_MASK GENMASK(15, 2)
+
+#define MTK_DP_AUX_P0_3630 (AUX_OFFSET + 0x30)
+#define AUX_TX_REQUEST_READY_AUX_TX_P0_MASK (BIT(3))
+#define AUX_TX_REQUEST_READY_AUX_TX_P0_SHIFT GENMASK(1, 0)
+
+#define MTK_DP_AUX_P0_3634 (AUX_OFFSET + 0x34)
+#define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_MASK GENMASK(15, 8)
+#define AUX_TX_OVER_SAMPLE_RATE_AUX_TX_P0_SHIFT (BIT(3))
+
+#define MTK_DP_AUX_P0_3640 (AUX_OFFSET + 0x40)
+#define AUX_RX_RECV_COMPLETE_IRQ_TX_P0_MASK (BIT(6))
+#define AUX_RX_AUX_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT GENMASK(2, 1)
+#define AUX_RX_EDID_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT (BIT(0) | BIT(2))
+#define AUX_RX_MCCS_RECV_COMPLETE_IRQ_AUX_TX_P0_SHIFT (BIT(2))
+#define AUX_RX_CMD_RECV_IRQ_AUX_TX_P0_SHIFT GENMASK(1, 0)
+#define AUX_RX_ADDR_RECV_IRQ_AUX_TX_P0_SHIFT (BIT(1))
+#define AUX_RX_DATA_RECV_IRQ_AUX_TX_P0_SHIFT (BIT(0))
+#define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_MASK (BIT(0))
+#define AUX_400US_TIMEOUT_IRQ_AUX_TX_P0_SHIFT 0
+
+#define MTK_DP_AUX_P0_3644 (AUX_OFFSET + 0x44)
+#define MCU_REQUEST_COMMAND_AUX_TX_P0_MASK GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3648 (AUX_OFFSET + 0x48)
+#define MCU_REQUEST_ADDRESS_LSB_AUX_TX_P0_MASK GENMASK(15, 0)
+
+#define MTK_DP_AUX_P0_364C (AUX_OFFSET + 0x4C)
+#define MCU_REQUEST_ADDRESS_MSB_AUX_TX_P0_MASK GENMASK(3, 0)
+
+#define MTK_DP_AUX_P0_3650 (AUX_OFFSET + 0x50)
+#define MCU_REQ_DATA_NUM_AUX_TX_P0_MASK GENMASK(15, 12)
+#define MCU_REQ_DATA_NUM_AUX_TX_P0_SHIFT GENMASK(3, 2)
+#define PHY_FIFO_RST_AUX_TX_P0_MASK (BIT(9))
+#define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_MASK (BIT(8))
+#define MCU_ACK_TRAN_COMPLETE_AUX_TX_P0_SHIFT (BIT(3))
+
+#define MTK_DP_AUX_P0_3658 (AUX_OFFSET + 0x58)
+#define AUX_TX_OV_EN_AUX_TX_P0_MASK (BIT(0))
+
+#define MTK_DP_AUX_P0_3690 (AUX_OFFSET + 0x90)
+#define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_MASK (BIT(8))
+#define RX_REPLY_COMPLETE_MODE_AUX_TX_P0_SHIFT (BIT(3))
+
+#define MTK_DP_AUX_P0_3704 (AUX_OFFSET + 0x104)
+#define AUX_TX_FIFO_WRITE_DATA_NEW_MODE_TOGGLE_AUX_TX_P0_MASK (BIT(1))
+#define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_MASK (BIT(2))
+#define AUX_TX_FIFO_NEW_MODE_EN_AUX_TX_P0_SHIFT (BIT(1))
+
+#define MTK_DP_AUX_P0_3708 (AUX_OFFSET + 0x108)
+
+#define MTK_DP_AUX_P0_37C8 (AUX_OFFSET + 0x1C8)
+#define MTK_ATOP_EN_AUX_TX_P0_MASK (BIT(0))
+#define MTK_ATOP_EN_AUX_TX_P0_SHIFT 0
+
+#define MTK_DP_TOP_PWR_STATE (TOP_OFFSET + 0x0)
+#define DP_PWR_STATE_MASK GENMASK(1, 0)
+#define DP_PWR_STATE_BANDGAP (BIT(0))
+#define DP_PWR_STATE_BANDGAP_TPLL (BIT(1))
+#define DP_PWR_STATE_BANDGAP_TPLL_LANE GENMASK(1, 0)
+
+#define MTK_DP_TOP_SWING_EMP (TOP_OFFSET + 0x4)
+#define DP_TX0_VOLT_SWING_MASK GENMASK(1, 0)
+#define DP_TX0_VOLT_SWING_SHIFT 0
+#define DP_TX0_PRE_EMPH_MASK GENMASK(3, 2)
+#define DP_TX0_PRE_EMPH_SHIFT (BIT(1))
+#define DP_TX1_VOLT_SWING_MASK GENMASK(9, 8)
+#define DP_TX1_VOLT_SWING_SHIFT (BIT(3))
+#define DP_TX1_PRE_EMPH_MASK GENMASK(11, 10)
+#define DP_TX2_VOLT_SWING_MASK GENMASK(17, 16)
+#define DP_TX2_PRE_EMPH_MASK GENMASK(19, 18)
+#define DP_TX3_VOLT_SWING_MASK GENMASK(25, 24)
+#define DP_TX3_PRE_EMPH_MASK GENMASK(27, 26)
+
+#define MTK_DP_TOP_RESET_AND_PROBE (TOP_OFFSET + 0x20)
+#define SW_RST_B_SHIFT 0
+#define SW_RST_B_PHYD (BIT(4) << SW_RST_B_SHIFT)
+
+#define MTK_DP_TOP_IRQ_STATUS (TOP_OFFSET + 0x28)
+#define RGS_IRQ_STATUS_SHIFT 0
+#define RGS_IRQ_STATUS_TRANSMITTER (BIT(1) << RGS_IRQ_STATUS_SHIFT)
+
+#define MTK_DP_TOP_IRQ_MASK (TOP_OFFSET + 0x2C)
+#define IRQ_MASK_AUX_TOP_IRQ BIT(2)
+
+#define MTK_DP_TOP_MEM_PD (TOP_OFFSET + 0x38)
+#define MEM_ISO_EN_SHIFT 0
+#define FUSE_SEL_SHIFT (BIT(1))
+
+#endif /*_MTK_DP_REG_H_*/
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index c8a233f609f0..eab64d4c241b 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -709,6 +709,7 @@  static struct platform_driver * const mtk_drm_drivers[] = {
 	&mtk_disp_ovl_driver,
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
+	&mtk_dp_driver,
 	&mtk_drm_platform_driver,
 	&mtk_dsi_driver,
 };
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 3e7d1e6fbe01..8926416f4419 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -53,6 +53,7 @@  extern struct platform_driver mtk_disp_gamma_driver;
 extern struct platform_driver mtk_disp_ovl_driver;
 extern struct platform_driver mtk_disp_rdma_driver;
 extern struct platform_driver mtk_dpi_driver;
+extern struct platform_driver mtk_dp_driver;
 extern struct platform_driver mtk_dsi_driver;
 
 #endif /* MTK_DRM_DRV_H */