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From: dillon.minfei@gmail.com
To: laurent.pinchart@ideasonboard.com, thierry.reding@gmail.com,
 sam@ravnborg.org, airlied@linux.ie, daniel@ffwll.ch,
 robh+dt@kernel.org, linus.walleij@linaro.org,
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Cc: noralf@tronnes.org, dianders@chromium.org,
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 linux-arm-kernel@lists.infradead.org,
 dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Dillon Min <dillon.minfei@gmail.com>
Subject: [PATCH v3 3/3] drm/panel: Add ilitek ili9341 panel driver
Date: Fri, 23 Jul 2021 12:06:43 +0800
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From: Dillon Min <dillon.minfei@gmail.com>

This driver combines tiny/ili9341.c mipi_dbi_interface driver
with mipi_dpi_interface driver, and can support ili9341 with serial
mode or parallel rgb interface mode by register configuration.

Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
---
v3:
all the v3 updates are based on Sam and Jagan's review.
- collect reviewed-by tags from linus and jagan.
- replace DRM_ERROR() with dev_err() or drm_err().
- remove kernel-doc markers from struct ili9341_config{}.
- reorder include headers.
- remove the struct device *dev from struct ili9341{}.
- restructure the ili9341_probe() function, add two ili9341_{dbi,dpi)_probe()
  to make it more readable according to jagan's suggestion, thanks.

For "So this is a full display driver. The more relevant home for this driver
is inside drm/tiny/."

I'm not sure if this is to ask me move the dpi code to drm/tiny/ili9341.c, and
remove this driver. or just remove the dbi code from this driver, but this will
result in two drivers to support the same panel (as Noralf does not agree with it).

so, waiting for the decision from Sam, Laurent, then will update in v4, thanks.

 drivers/gpu/drm/panel/Kconfig                |  12 +
 drivers/gpu/drm/panel/Makefile               |   1 +
 drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 786 +++++++++++++++++++++++++++
 3 files changed, 799 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ef87d92cdf49..eb34b8d1b19a 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -124,6 +124,18 @@ config DRM_PANEL_ILITEK_IL9322
 	  Say Y here if you want to enable support for Ilitek IL9322
 	  QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
 
+config DRM_PANEL_ILITEK_ILI9341
+	tristate "Ilitek ILI9341 240x320 QVGA panels"
+	depends on OF && SPI
+	depends on DRM_KMS_HELPER
+	depends on DRM_KMS_CMA_HELPER
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_MIPI_DBI
+	help
+	  Say Y here if you want to enable support for Ilitek IL9341
+	  QVGA (240x320) RGB panels. support serial & parallel rgb
+	  interface.
+
 config DRM_PANEL_ILITEK_ILI9881C
 	tristate "Ilitek ILI9881C-based panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index cae4d976c069..0ecde184665d 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o
 obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o
 obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
new file mode 100644
index 000000000000..5ab6f18c3ce1
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -0,0 +1,786 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ilitek ILI9341 TFT LCD drm_panel driver.
+ *
+ * This panel can be configured to support:
+ * - 16-bit parallel RGB interface
+ * - 18-bit parallel RGB interface
+ * - 4-line serial spi interface
+ *
+ * Copyright (C) 2021 Dillon Min <dillon.minfei@gmail.com>
+ * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
+ * the reuse of DBI abstraction part referred from Linus's patch
+ * "drm/panel: s6e63m0: Switch to DBI abstraction for SPI"
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#define ILI9341_RGB_INTERFACE  0xb0   /* RGB Interface Signal Control */
+#define ILI9341_FRC            0xb1   /* Frame Rate Control register */
+#define ILI9341_DFC            0xb6   /* Display Function Control register */
+#define ILI9341_POWER1         0xc0   /* Power Control 1 register */
+#define ILI9341_POWER2         0xc1   /* Power Control 2 register */
+#define ILI9341_VCOM1          0xc5   /* VCOM Control 1 register */
+#define ILI9341_VCOM2          0xc7   /* VCOM Control 2 register */
+#define ILI9341_POWERA         0xcb   /* Power control A register */
+#define ILI9341_POWERB         0xcf   /* Power control B register */
+#define ILI9341_PGAMMA         0xe0   /* Positive Gamma Correction register */
+#define ILI9341_NGAMMA         0xe1   /* Negative Gamma Correction register */
+#define ILI9341_DTCA           0xe8   /* Driver timing control A */
+#define ILI9341_DTCB           0xea   /* Driver timing control B */
+#define ILI9341_POWER_SEQ      0xed   /* Power on sequence register */
+#define ILI9341_3GAMMA_EN      0xf2   /* 3 Gamma enable register */
+#define ILI9341_INTERFACE      0xf6   /* Interface control register */
+#define ILI9341_PRC            0xf7   /* Pump ratio control register */
+#define ILI9341_ETMOD	       0xb7   /* Entry mode set */
+
+#define ILI9341_MADCTL_BGR	BIT(3)
+#define ILI9341_MADCTL_MV	BIT(5)
+#define ILI9341_MADCTL_MX	BIT(6)
+#define ILI9341_MADCTL_MY	BIT(7)
+
+#define ILI9341_POWER_B_LEN	3
+#define ILI9341_POWER_SEQ_LEN	4
+#define ILI9341_DTCA_LEN	3
+#define ILI9341_DTCB_LEN	2
+#define ILI9341_POWER_A_LEN	5
+#define ILI9341_DFC_1_LEN	2
+#define ILI9341_FRC_LEN		2
+#define ILI9341_VCOM_1_LEN	2
+#define ILI9341_DFC_2_LEN	4
+#define ILI9341_COLUMN_ADDR_LEN	4
+#define ILI9341_PAGE_ADDR_LEN	4
+#define ILI9341_INTERFACE_LEN	3
+#define ILI9341_PGAMMA_LEN	15
+#define ILI9341_NGAMMA_LEN	15
+#define ILI9341_CA_LEN		3
+
+#define ILI9341_PIXEL_DPI_16_BITS	(BIT(6) | BIT(4))
+#define ILI9341_PIXEL_DPI_18_BITS	(BIT(6) | BIT(5))
+#define ILI9341_GAMMA_CURVE_1		BIT(0)
+#define ILI9341_IF_WE_MODE		BIT(0)
+#define ILI9341_IF_BIG_ENDIAN		0x00
+#define ILI9341_IF_DM_RGB		BIT(2)
+#define ILI9341_IF_DM_INTERNAL		0x00
+#define ILI9341_IF_DM_VSYNC		BIT(3)
+#define ILI9341_IF_RM_RGB		BIT(1)
+#define ILI9341_IF_RIM_RGB		0x00
+
+#define ILI9341_COLUMN_ADDR		0x00ef
+#define ILI9341_PAGE_ADDR		0x013f
+
+#define ILI9341_RGB_EPL			BIT(0)
+#define ILI9341_RGB_DPL			BIT(1)
+#define ILI9341_RGB_HSPL		BIT(2)
+#define ILI9341_RGB_VSPL		BIT(3)
+#define ILI9341_RGB_DE_MODE		BIT(6)
+#define ILI9341_RGB_DISP_PATH_MEM	BIT(7)
+
+#define ILI9341_DBI_VCOMH_4P6V		0x23
+#define ILI9341_DBI_PWR_2_DEFAULT	0x10
+#define ILI9341_DBI_PRC_NORMAL		0x20
+#define ILI9341_DBI_VCOM_1_VMH_4P25V	0x3e
+#define ILI9341_DBI_VCOM_1_VML_1P5V	0x28
+#define ILI9341_DBI_VCOM_2_DEC_58	0x86
+#define ILI9341_DBI_FRC_DIVA		0x00
+#define ILI9341_DBI_FRC_RTNA		0x1b
+#define ILI9341_DBI_EMS_GAS		BIT(0)
+#define ILI9341_DBI_EMS_DTS		BIT(1)
+#define ILI9341_DBI_EMS_GON		BIT(2)
+
+/* struct ili9341_config - the system specific ILI9341 configuration */
+struct ili9341_config {
+	u32 max_spi_speed;
+	/* mode: the drm display mode */
+	const struct drm_display_mode mode;
+	/* ca: TODO: need comments for this register */
+	u8 ca[ILI9341_CA_LEN];
+	/* power_b: TODO: need comments for this register */
+	u8 power_b[ILI9341_POWER_B_LEN];
+	/* power_seq: TODO: need comments for this register */
+	u8 power_seq[ILI9341_POWER_SEQ_LEN];
+	/* dtca: TODO: need comments for this register */
+	u8 dtca[ILI9341_DTCA_LEN];
+	/* dtcb: TODO: need comments for this register */
+	u8 dtcb[ILI9341_DTCB_LEN];
+	/* power_a: TODO: need comments for this register */
+	u8 power_a[ILI9341_POWER_A_LEN];
+	/* frc: Frame Rate Control (In Normal Mode/Full Colors) (B1h) */
+	u8 frc[ILI9341_FRC_LEN];
+	/* prc: TODO: need comments for this register */
+	u8 prc;
+	/* dfc_1: B6h DISCTRL (Display Function Control) */
+	u8 dfc_1[ILI9341_DFC_1_LEN];
+	/* power_1: Power Control 1 (C0h) */
+	u8 power_1;
+	/* power_2: Power Control 2 (C1h) */
+	u8 power_2;
+	/* vcom_1: VCOM Control 1(C5h) */
+	u8 vcom_1[ILI9341_VCOM_1_LEN];
+	/* vcom_2: VCOM Control 2(C7h) */
+	u8 vcom_2;
+	/* address_mode: Memory Access Control (36h) */
+	u8 address_mode;
+	/* g3amma_en: TODO: need comments for this register */
+	u8 g3amma_en;
+	/* rgb_interface: RGB Interface Signal Control (B0h) */
+	u8 rgb_interface;
+	/* dfc_2: refer to dfc_1 */
+	u8 dfc_2[ILI9341_DFC_2_LEN];
+	/* column_addr: Column Address Set (2Ah) */
+	u8 column_addr[ILI9341_COLUMN_ADDR_LEN];
+	/* page_addr: Page Address Set (2Bh) */
+	u8 page_addr[ILI9341_PAGE_ADDR_LEN];
+	/* interface: Interface Control (F6h) */
+	u8 interface[ILI9341_INTERFACE_LEN];
+	/*
+	 * pixel_format: This command sets the pixel format for the RGB
+	 * image data used by
+	 */
+	u8 pixel_format;
+	/*
+	 * gamma_curve: This command is used to select the desired Gamma
+	 * curve for the
+	 */
+	u8 gamma_curve;
+	/* pgamma: Positive Gamma Correction (E0h) */
+	u8 pgamma[ILI9341_PGAMMA_LEN];
+	/* ngamma: Negative Gamma Correction (E1h) */
+	u8 ngamma[ILI9341_NGAMMA_LEN];
+};
+
+struct ili9341 {
+	struct device *dev;
+	const struct ili9341_config *conf;
+	struct drm_panel panel;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *dc_gpio;
+	struct mipi_dbi *dbi;
+	u32 max_spi_speed;
+	struct regulator_bulk_data supplies[3];
+};
+
+/*
+ * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller
+ */
+static const struct ili9341_config ili9341_stm32f429_disco_data = {
+	.max_spi_speed = 10000000,
+	.mode = {
+		.clock = 6100,
+		.hdisplay = 240,
+		.hsync_start = 240 + 10,/* hfp 10 */
+		.hsync_end = 240 + 10 + 10,/* hsync 10 */
+		.htotal = 240 + 10 + 10 + 20,/* hbp 20 */
+		.vdisplay = 320,
+		.vsync_start = 320 + 4,/* vfp 4 */
+		.vsync_end = 320 + 4 + 2,/* vsync 2 */
+		.vtotal = 320 + 4 + 2 + 2,/* vbp 2 */
+		.flags = 0,
+		.width_mm = 65,
+		.height_mm = 50,
+		.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+	},
+	.ca = {0xc3, 0x08, 0x50},
+	.power_b = {0x00, 0xc1, 0x30},
+	.power_seq = {0x64, 0x03, 0x12, 0x81},
+	.dtca = {0x85, 0x00, 0x78},
+	.power_a = {0x39, 0x2c, 0x00, 0x34, 0x02},
+	.prc = 0x20,
+	.dtcb = {0x00, 0x00},
+	/* 0x00 fosc, 0x1b 70hz */
+	.frc = {0x00, 0x1b},
+	/*
+	 * 0x0a Interval scan, AGND AGND AGND AGND
+	 * 0xa2 Normally white, G1 -> G320, S720 -> S1,
+	 *	Scan Cycle 5 frames,85ms
+	 */
+	.dfc_1 = {0x0a, 0xa2},
+	/* 0x10 3.65v */
+	.power_1 = 0x10,
+	/* 0x10 AVDD=vci*2, VGH=vci*7, VGL=-vci*4 */
+	.power_2 = 0x10,
+	/* 0x45 VCOMH 4.425v, 0x15 VCOML -1.975*/
+	.vcom_1 = {0x45, 0x15},
+	/* 0x90 offset voltage, VMH-48, VML-48 */
+	.vcom_2 = 0x90,
+	/*
+	 * 0xc8 Row Address Order, Column Address Order
+	 * BGR 1
+	 */
+	.address_mode = 0xc8,
+	.g3amma_en = 0x00,
+	/*
+	 * 0xc2
+	 * Display Data Path: Memory
+	 * RGB: DE mode
+	 * DOTCLK polarity set (data fetched at the falling time)
+	 */
+	.rgb_interface = ILI9341_RGB_DISP_PATH_MEM |
+			ILI9341_RGB_DE_MODE |
+			ILI9341_RGB_DPL,
+	/*
+	 * 0x0a
+	 * Gate outputs in non-display area: Interval scan
+	 * Determine source/VCOM output in a non-display area in the partial
+	 * display mode: AGND AGND AGND AGND
+	 *
+	 * 0xa7
+	 * Scan Cycle: 15 frames
+	 * fFLM = 60Hz: 255ms
+	 * Liquid crystal type: Normally white
+	 * Gate Output Scan Direction: G1 -> G320
+	 * Source Output Scan Direction: S720 -> S1
+	 *
+	 * 0x27
+	 * LCD Driver Line: 320 lines
+	 *
+	 * 0x04
+	 * PCDIV: 4
+	 */
+	.dfc_2 = {0x0a, 0xa7, 0x27, 0x04},
+	/* column address: 240 */
+	.column_addr = {0x00, 0x00, (ILI9341_COLUMN_ADDR >> 4) & 0xff,
+				ILI9341_COLUMN_ADDR & 0xff},
+	/* page address: 320 */
+	.page_addr = {0x00, 0x00, (ILI9341_PAGE_ADDR >> 4) & 0xff,
+				ILI9341_PAGE_ADDR & 0xff},
+	/*
+	 * Memory write control: When the transfer number of data exceeds
+	 * (EC-SC+1)*(EP-SP+1), the column and page number will be
+	 * reset, and the exceeding data will be written into the following
+	 * column and page.
+	 * Display Operation Mode: RGB Interface Mode
+	 * Interface for RAM Access: RGB interface
+	 * 16- bit RGB interface (1 transfer/pixel)
+	 */
+	.interface = {ILI9341_IF_WE_MODE, 0x00,
+			ILI9341_IF_DM_RGB | ILI9341_IF_RM_RGB},
+	/* DPI: 16 bits / pixel */
+	.pixel_format = ILI9341_PIXEL_DPI_16_BITS,
+	/* Curve Selected: Gamma curve 1 (G2.2) */
+	.gamma_curve = ILI9341_GAMMA_CURVE_1,
+	.pgamma = {0x0f, 0x29, 0x24, 0x0c, 0x0e,
+			0x09, 0x4e, 0x78, 0x3c, 0x09,
+			0x13, 0x05, 0x17, 0x11, 0x00},
+	.ngamma = {0x00, 0x16, 0x1b, 0x04, 0x11,
+			0x07, 0x31, 0x33, 0x42, 0x05,
+			0x0c, 0x0a, 0x28, 0x2f, 0x0f},
+};
+
+static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
+{
+	return container_of(panel, struct ili9341, panel);
+}
+
+static void ili9341_dpi_init(struct ili9341 *ili)
+{
+	struct device *dev = (&ili->panel)->dev;
+	struct mipi_dbi *dbi = ili->dbi;
+	struct ili9341_config *cfg = (struct ili9341_config *)ili->conf;
+
+	/* Power Control */
+	mipi_dbi_command_stackbuf(dbi, 0xca, cfg->ca, ILI9341_CA_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_POWERB, cfg->power_b,
+				  ILI9341_POWER_B_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_POWER_SEQ, cfg->power_seq,
+				  ILI9341_POWER_SEQ_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_DTCA, cfg->dtca,
+				  ILI9341_DTCA_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_POWERA, cfg->power_a,
+				  ILI9341_POWER_A_LEN);
+	mipi_dbi_command(ili->dbi, ILI9341_PRC, cfg->prc);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_DTCB, cfg->dtcb,
+				  ILI9341_DTCB_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_FRC, cfg->frc, ILI9341_FRC_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_1,
+				  ILI9341_DFC_1_LEN);
+	mipi_dbi_command(dbi, ILI9341_POWER1, cfg->power_1);
+	mipi_dbi_command(dbi, ILI9341_POWER2, cfg->power_2);
+
+	/* VCOM */
+	mipi_dbi_command_stackbuf(dbi, ILI9341_VCOM1, cfg->vcom_1,
+				  ILI9341_VCOM_1_LEN);
+	mipi_dbi_command(dbi, ILI9341_VCOM2, cfg->vcom_2);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, cfg->address_mode);
+
+	/* Gamma */
+	mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, cfg->g3amma_en);
+	mipi_dbi_command(dbi, ILI9341_RGB_INTERFACE, cfg->rgb_interface);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_2,
+				  ILI9341_DFC_2_LEN);
+
+	/* Colomn address set */
+	mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
+				  cfg->column_addr, ILI9341_COLUMN_ADDR_LEN);
+
+	/* Page address set */
+	mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
+				  cfg->page_addr, ILI9341_PAGE_ADDR_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_INTERFACE, cfg->interface,
+				  ILI9341_INTERFACE_LEN);
+
+	/* Format */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, cfg->pixel_format);
+	mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
+	msleep(200);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, cfg->gamma_curve);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_PGAMMA, cfg->pgamma,
+				  ILI9341_PGAMMA_LEN);
+	mipi_dbi_command_stackbuf(dbi, ILI9341_NGAMMA, cfg->ngamma,
+				  ILI9341_NGAMMA_LEN);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(200);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
+
+	dev_info(dev, "Initialized display rgb interface\n");
+}
+
+static int ili9341_dpi_power_on(struct ili9341 *ili)
+{
+	struct device *dev = (&ili->panel)->dev;
+	int ret = 0;
+
+	/* Assert RESET */
+	gpiod_set_value(ili->reset_gpio, 1);
+
+	/* Enable power */
+	ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies),
+				    ili->supplies);
+	if (ret < 0) {
+		dev_err(dev, "unable to enable vcc\n");
+		return ret;
+	}
+	msleep(20);
+
+	/* De-assert RESET */
+	gpiod_set_value(ili->reset_gpio, 0);
+	msleep(20);
+
+	return 0;
+}
+
+static int ili9341_dpi_power_off(struct ili9341 *ili)
+{
+	/* Assert RESET */
+	gpiod_set_value(ili->reset_gpio, 1);
+
+	/* Disable power */
+	return regulator_bulk_disable(ARRAY_SIZE(ili->supplies),
+				      ili->supplies);
+}
+
+static int ili9341_dpi_disable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+
+	mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_OFF);
+	return 0;
+}
+
+static int ili9341_dpi_unprepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+
+	return ili9341_dpi_power_off(ili);
+}
+
+static int ili9341_dpi_prepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	int ret;
+
+	ret = ili9341_dpi_power_on(ili);
+	if (ret < 0)
+		return ret;
+
+	ili9341_dpi_init(ili);
+
+	return ret;
+}
+
+static int ili9341_dpi_enable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+
+	mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_ON);
+	return 0;
+}
+
+static int ili9341_dpi_get_modes(struct drm_panel *panel,
+				 struct drm_connector *connector)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	struct drm_device *drm = connector->dev;
+	struct drm_display_mode *mode;
+	struct drm_display_info *info;
+
+	info = &connector->display_info;
+	info->width_mm = ili->conf->mode.width_mm;
+	info->height_mm = ili->conf->mode.height_mm;
+
+	if (ili->conf->rgb_interface & ILI9341_RGB_DPL)
+		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
+	else
+		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
+	if (ili->conf->rgb_interface & ILI9341_RGB_EPL)
+		info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
+	else
+		info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+
+	mode = drm_mode_duplicate(drm, &ili->conf->mode);
+	if (!mode) {
+		drm_err(drm, "bad mode or failed to add mode\n");
+		return -EINVAL;
+	}
+	drm_mode_set_name(mode);
+
+	/* Set up the polarity */
+	if (ili->conf->rgb_interface & ILI9341_RGB_HSPL)
+		mode->flags |= DRM_MODE_FLAG_PHSYNC;
+	else
+		mode->flags |= DRM_MODE_FLAG_NHSYNC;
+
+	if (ili->conf->rgb_interface & ILI9341_RGB_VSPL)
+		mode->flags |= DRM_MODE_FLAG_PVSYNC;
+	else
+		mode->flags |= DRM_MODE_FLAG_NVSYNC;
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs ili9341_dpi_funcs = {
+	.disable = ili9341_dpi_disable,
+	.unprepare = ili9341_dpi_unprepare,
+	.prepare = ili9341_dpi_prepare,
+	.enable = ili9341_dpi_enable,
+	.get_modes = ili9341_dpi_get_modes,
+};
+
+static void ili9341_dbi_enable(struct drm_simple_display_pipe *pipe,
+			       struct drm_crtc_state *crtc_state,
+			       struct drm_plane_state *plane_state)
+{
+	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
+	struct mipi_dbi *dbi = &dbidev->dbi;
+	u8 addr_mode;
+	int ret, idx;
+
+	if (!drm_dev_enter(pipe->crtc.dev, &idx))
+		return;
+
+	ret = mipi_dbi_poweron_conditional_reset(dbidev);
+	if (ret < 0)
+		goto out_exit;
+	if (ret == 1)
+		goto out_enable;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+
+	mipi_dbi_command(dbi, ILI9341_POWERB, 0x00, 0xc1, 0x30);
+	mipi_dbi_command(dbi, ILI9341_POWER_SEQ, 0x64, 0x03, 0x12, 0x81);
+	mipi_dbi_command(dbi, ILI9341_DTCA, 0x85, 0x00, 0x78);
+	mipi_dbi_command(dbi, ILI9341_POWERA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+	mipi_dbi_command(dbi, ILI9341_PRC, ILI9341_DBI_PRC_NORMAL);
+	mipi_dbi_command(dbi, ILI9341_DTCB, 0x00, 0x00);
+
+	/* Power Control */
+	mipi_dbi_command(dbi, ILI9341_POWER1, ILI9341_DBI_VCOMH_4P6V);
+	mipi_dbi_command(dbi, ILI9341_POWER2, ILI9341_DBI_PWR_2_DEFAULT);
+	/* VCOM */
+	mipi_dbi_command(dbi, ILI9341_VCOM1, ILI9341_DBI_VCOM_1_VMH_4P25V,
+			 ILI9341_DBI_VCOM_1_VML_1P5V);
+	mipi_dbi_command(dbi, ILI9341_VCOM2, ILI9341_DBI_VCOM_2_DEC_58);
+
+	/* Memory Access Control */
+	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
+			 MIPI_DCS_PIXEL_FMT_16BIT);
+
+	/* Frame Rate */
+	mipi_dbi_command(dbi, ILI9341_FRC, ILI9341_DBI_FRC_DIVA & 0x03,
+			 ILI9341_DBI_FRC_RTNA & 0x1f);
+
+	/* Gamma */
+	mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, ILI9341_GAMMA_CURVE_1);
+	mipi_dbi_command(dbi, ILI9341_PGAMMA,
+			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+	mipi_dbi_command(dbi, ILI9341_NGAMMA,
+			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+	/* DDRAM */
+	mipi_dbi_command(dbi, ILI9341_ETMOD, ILI9341_DBI_EMS_GAS |
+			 ILI9341_DBI_EMS_DTS |
+			 ILI9341_DBI_EMS_GON);
+
+	/* Display */
+	mipi_dbi_command(dbi, ILI9341_DFC, 0x08, 0x82, 0x27, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+out_enable:
+	switch (dbidev->rotation) {
+	default:
+		addr_mode = ILI9341_MADCTL_MX;
+		break;
+	case 90:
+		addr_mode = ILI9341_MADCTL_MV;
+		break;
+	case 180:
+		addr_mode = ILI9341_MADCTL_MY;
+		break;
+	case 270:
+		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+			    ILI9341_MADCTL_MX;
+		break;
+	}
+
+	addr_mode |= ILI9341_MADCTL_BGR;
+	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
+	drm_info(&dbidev->drm, "Initialized display serial interface\n");
+out_exit:
+	drm_dev_exit(idx);
+}
+
+static const struct drm_simple_display_pipe_funcs ili9341_dbi_funcs = {
+	.enable = ili9341_dbi_enable,
+	.disable = mipi_dbi_pipe_disable,
+	.update = mipi_dbi_pipe_update,
+	.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode ili9341_dbi_mode = {
+	DRM_SIMPLE_MODE(240, 320, 37, 49),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(ili9341_dbi_fops);
+
+static struct drm_driver ili9341_dbi_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops			= &ili9341_dbi_fops,
+	DRM_GEM_CMA_DRIVER_OPS_VMAP,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "ili9341",
+	.desc			= "Ilitek ILI9341",
+	.date			= "20210716",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static int ili9341_dbi_probe(struct spi_device *spi, struct gpio_desc *dc,
+			     struct gpio_desc *reset)
+{
+	struct device *dev = &spi->dev;
+	struct mipi_dbi_dev *dbidev;
+	struct mipi_dbi *dbi;
+	struct drm_device *drm;
+	struct regulator *vcc;
+	u32 rotation = 0;
+	int ret;
+
+	vcc = devm_regulator_get_optional(dev, "vcc");
+	if (IS_ERR(vcc))
+		dev_err(dev, "get optional vcc failed\n");
+
+	dbidev = devm_drm_dev_alloc(dev, &ili9341_dbi_driver,
+				    struct mipi_dbi_dev, drm);
+	if (IS_ERR(dbidev))
+		return PTR_ERR(dbidev);
+
+	dbi = &dbidev->dbi;
+	drm = &dbidev->drm;
+	dbi->reset = reset;
+	dbidev->regulator = vcc;
+
+	drm_mode_config_init(drm);
+
+	dbidev->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(dbidev->backlight))
+		return PTR_ERR(dbidev->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, dbi, dc);
+	if (ret)
+		return ret;
+
+	ret = mipi_dbi_dev_init(dbidev, &ili9341_dbi_funcs,
+				&ili9341_dbi_mode, rotation);
+	if (ret)
+		return ret;
+
+	drm_mode_config_reset(drm);
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, drm);
+
+	drm_fbdev_generic_setup(drm, 0);
+
+	return 0;
+}
+
+static int ili9341_dpi_probe(struct spi_device *spi, struct gpio_desc *dc,
+			     struct gpio_desc *reset)
+{
+	struct device *dev = &spi->dev;
+	struct ili9341 *ili;
+	int ret;
+
+	ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
+	if (!ili)
+		return -ENOMEM;
+
+	ili->dbi = devm_kzalloc(dev, sizeof(struct mipi_dbi),
+				GFP_KERNEL);
+	if (!ili->dbi)
+		return -ENOMEM;
+
+	ili->supplies[0].supply = "vci";
+	ili->supplies[1].supply = "vddi";
+	ili->supplies[2].supply = "vddi-led";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ili->supplies),
+				      ili->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dbi_spi_init(spi, ili->dbi, dc);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, ili);
+	ili->reset_gpio = reset;
+	/*
+	 * Every new incarnation of this display must have a unique
+	 * data entry for the system in this driver.
+	 */
+	ili->conf = of_device_get_match_data(dev);
+	if (!ili->conf) {
+		dev_err(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	ili->max_spi_speed = ili->conf->max_spi_speed;
+	drm_panel_init(&ili->panel, dev, &ili9341_dpi_funcs,
+		       DRM_MODE_CONNECTOR_DPI);
+	drm_panel_add(&ili->panel);
+
+	return 0;
+}
+
+static int ili9341_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct gpio_desc *dc;
+	struct gpio_desc *reset;
+	const struct spi_device_id *id = spi_get_device_id(spi);
+
+	reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(reset))
+		dev_err(dev, "Failed to get gpio 'reset'\n");
+
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc))
+		dev_err(dev, "Failed to get gpio 'dc'\n");
+
+	if (!strcmp(id->name, "sf-tc240t-9370-t"))
+		return ili9341_dpi_probe(spi, dc, reset);
+	else if (!strcmp(id->name, "yx240qv29"))
+		return ili9341_dbi_probe(spi, dc, reset);
+
+	return -1;
+}
+
+static int ili9341_remove(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct ili9341 *ili = spi_get_drvdata(spi);
+	struct drm_device *drm = spi_get_drvdata(spi);
+
+	if (!strcmp(id->name, "sf-tc240t-9370-t")) {
+		ili9341_dpi_power_off(ili);
+		drm_panel_remove(&ili->panel);
+	} else if (!strcmp(id->name, "yx240qv29")) {
+		drm_dev_unplug(drm);
+		drm_atomic_helper_shutdown(drm);
+	}
+	return 0;
+}
+
+static void ili9341_shutdown(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+
+	if (!strcmp(id->name, "yx240qv29"))
+		drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static const struct of_device_id ili9341_of_match[] = {
+	{
+		.compatible = "st,sf-tc240t-9370-t",
+		.data = &ili9341_stm32f429_disco_data,
+	},
+	{
+		/* porting from tiny/ili9341.c
+		 * for original mipi dbi compitable
+		 */
+		.compatible = "adafruit,yx240qv29",
+		.data = NULL,
+	},
+};
+MODULE_DEVICE_TABLE(of, ili9341_of_match);
+
+static const struct spi_device_id ili9341_id[] = {
+	{ "yx240qv29", 0 },
+	{ "sf-tc240t-9370-t", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ili9341_id);
+
+static struct spi_driver ili9341_driver = {
+	.probe = ili9341_probe,
+	.remove = ili9341_remove,
+	.shutdown = ili9341_shutdown,
+	.id_table = ili9341_id,
+	.driver = {
+		.name = "panel-ilitek-ili9341",
+		.of_match_table = ili9341_of_match,
+	},
+};
+module_spi_driver(ili9341_driver);
+
+MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>");
+MODULE_DESCRIPTION("ILI9341 LCD panel driver");
+MODULE_LICENSE("GPL v2");