diff mbox series

[v13,06/10] drm/mediatek: Add MT8195 External DisplayPort support

Message ID 20220701062808.18596-7-rex-bc.chen@mediatek.com
State Superseded
Headers show
Series drm/mediatek: Add MT8195 DisplayPort driver | expand

Commit Message

Rex-BC Chen (陳柏辰) July 1, 2022, 6:28 a.m. UTC 
From: Guillaume Ranquet <granquet@baylibre.com>

This patch adds External DisplayPort support to the mt8195 eDP driver.

Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dp.c     | 197 +++++++++++++++++++++-----
 drivers/gpu/drm/mediatek/mtk_dp_reg.h |   1 +
 2 files changed, 161 insertions(+), 37 deletions(-)

Comments

Rex-BC Chen (陳柏辰) July 5, 2022, 9:51 a.m. UTC | #1 
On Fri, 2022-07-01 at 16:14 +0800, AngeloGioacchino Del Regno wrote:
> Il 01/07/22 08:28, Bo-Chen Chen ha scritto:
> > From: Guillaume Ranquet <granquet@baylibre.com>
> > 
> > This patch adds External DisplayPort support to the mt8195 eDP
> > driver.
> > 
> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> > ---
> >   drivers/gpu/drm/mediatek/mtk_dp.c     | 197
> > +++++++++++++++++++++-----
> >   drivers/gpu/drm/mediatek/mtk_dp_reg.h |   1 +
> >   2 files changed, 161 insertions(+), 37 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> > b/drivers/gpu/drm/mediatek/mtk_dp.c
> > index b672d5a6f5bd..c3be97dd055c 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> > @@ -105,6 +105,7 @@ struct mtk_dp {
> >   	struct regmap *regs;
> >   
> >   	bool enabled;
> > +	bool has_fec;
> 
> You're introducing this has_fec variable here....
> 
> >   
> >   	struct drm_connector *conn;
> >   };
> 
> 
> > @@ -1018,6 +1074,8 @@ static void
> > mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
> >   	mtk_dp->info.depth = DP_MSA_MISC_8_BPC;
> >   	memset(&mtk_dp->info.timings, 0, sizeof(struct
> > mtk_dp_timings));
> >   	mtk_dp->info.timings.frame_rate = 60;
> > +
> > +	mtk_dp->has_fec = false;
> 
> .... setting it as false here ....
> 
> >   }
> >   
> >   static void mtk_dp_setup_tu(struct mtk_dp *mtk_dp)
> > @@ -1498,15 +1562,38 @@ static int mtk_dp_init_port(struct mtk_dp
> > *mtk_dp)
> >   static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
> >   {
> >   	struct mtk_dp *mtk_dp = dev;
> > +	int event;
> >   	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
> >   
> > +	event = mtk_dp_plug_state(mtk_dp) ?
> > +		connector_status_connected :
> > connector_status_disconnected;
> > +
> > +	if (event < 0)
> > +		return IRQ_HANDLED;
> > +
> > +	dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n");
> 
> P.S.: This should be a dev_dbg().
> 
> > +	drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
> > +
> >   	if (mtk_dp->train_info.cable_state_change) {
> >   		mtk_dp->train_info.cable_state_change = false;
> >   
> > -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> > -				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> > -				   DP_PWR_STATE_MASK);
> > -		drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
> > +		if (!mtk_dp->train_info.cable_plugged_in) {
> > +			mtk_dp_video_mute(mtk_dp, true);
> > +
> > +			mtk_dp_initialize_priv_data(mtk_dp);
> > +			mtk_dp_set_idle_pattern(mtk_dp, true);
> > +			if (mtk_dp->has_fec)
> 
> ...and you're checking it here, but there's nothing ever setting that
> as true!
> 
> Is there anything you forgot? :-)
> 
> Cheers,
> Angelo

Hello Angelo,

Thanks for your review.
We do not support fec currently, so I will drop them.

Thanks!

BRs,
Bo-Chen
diff mbox series

Patch

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index b672d5a6f5bd..c3be97dd055c 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -105,6 +105,7 @@  struct mtk_dp {
 	struct regmap *regs;
 
 	bool enabled;
+	bool has_fec;
 
 	struct drm_connector *conn;
 };
@@ -117,6 +118,11 @@  static struct regmap_config mtk_dp_regmap_config = {
 	.name = "mtk-dp-registers",
 };
 
+static bool mtk_dp_is_edp(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp->next_bridge;
+}
+
 static struct mtk_dp *mtk_dp_from_bridge(struct drm_bridge *b)
 {
 	return container_of(b, struct mtk_dp, bridge);
@@ -384,6 +390,14 @@  static bool mtk_dp_plug_state(struct mtk_dp *mtk_dp)
 		  HPD_DB_DP_TRANS_P0_MASK);
 }
 
+static bool mtk_dp_plug_state_avoid_pulse(struct mtk_dp *mtk_dp)
+{
+	bool ret;
+
+	return !(readx_poll_timeout(mtk_dp_plug_state, mtk_dp, ret, ret,
+				    4000, 7 * 4000));
+}
+
 static void mtk_dp_aux_irq_clear(struct mtk_dp *mtk_dp)
 {
 	mtk_dp_write(mtk_dp, MTK_DP_AUX_P0_3640,
@@ -608,6 +622,13 @@  static void mtk_dp_reset_swing_pre_emphasis(struct mtk_dp *mtk_dp)
 			   DP_TX3_PRE_EMPH_MASK);
 }
 
+static void mtk_dp_fec_enable(struct mtk_dp *mtk_dp, bool enable)
+{
+	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 u32 mtk_dp_swirq_get_clear(struct mtk_dp *mtk_dp)
 {
 	u32 irq_status = mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_35D0) &
@@ -823,35 +844,67 @@  static void mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
 		return;
 	}
 
-	cal_data->glb_bias_trim =
-		check_cal_data_valid(mtk_dp, 1, 0x1e,
-				     (buf[3] >> 27) & 0x1f, 0xf);
-	cal_data->clktx_impse =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[0] >> 9) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[0] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 28) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[0] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 24) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[1] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 20) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[1] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 16) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[2] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 12) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[2] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 8) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[3] =
-		check_cal_data_valid(mtk_dp, 1, 0xe,
-				     (buf[2] >> 4) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[3] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, buf[2] & 0xf, 0x8);
+	if (mtk_dp_is_edp(mtk_dp)) {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(mtk_dp, 1, 0x1e,
+					     (buf[3] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[0] >> 9) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 28) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 24) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 20) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 16) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 12) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 8) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[2] >> 4) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, buf[2] & 0xf, 0x8);
+	} else {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(mtk_dp, 1, 0x1e,
+					     (buf[0] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[0] >> 13) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 28) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 24) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 20) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 16) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 12) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 8) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe,
+					     (buf[1] >> 4) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, buf[1] & 0xf, 0x8);
+	}
 
 	kfree(buf);
 }
@@ -971,7 +1024,10 @@  static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
 			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
 			   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
 
-	mtk_dp_sip_atf_call(mtk_dp, MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+	mtk_dp_sip_atf_call(mtk_dp,
+			    mtk_dp_is_edp(mtk_dp) ?
+			    MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE :
+			    MTK_DP_SIP_ATF_VIDEO_UNMUTE, enable);
 }
 
 static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
@@ -1018,6 +1074,8 @@  static void mtk_dp_initialize_priv_data(struct mtk_dp *mtk_dp)
 	mtk_dp->info.depth = DP_MSA_MISC_8_BPC;
 	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)
@@ -1306,6 +1364,9 @@  static int mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp)
 	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))
+		return -ENODEV;
+
 	drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap);
 
 	train_info->link_rate = min_t(int, mtk_dp->max_linkrate,
@@ -1357,6 +1418,9 @@  static int mtk_dp_train_start(struct mtk_dp *mtk_dp)
 	u8 train_limit;
 	u8 max_link_rate;
 
+	if (!mtk_dp_plug_state_avoid_pulse(mtk_dp))
+		return -ENODEV;
+
 	link_rate = mtk_dp->rx_cap[1];
 	lane_count = mtk_dp->rx_cap[2] & 0x1F;
 
@@ -1498,15 +1562,38 @@  static int mtk_dp_init_port(struct mtk_dp *mtk_dp)
 static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
 {
 	struct mtk_dp *mtk_dp = dev;
+	int event;
 	u8 buf[DP_RECEIVER_CAP_SIZE] = {};
 
+	event = mtk_dp_plug_state(mtk_dp) ?
+		connector_status_connected : connector_status_disconnected;
+
+	if (event < 0)
+		return IRQ_HANDLED;
+
+	dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n");
+	drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
+
 	if (mtk_dp->train_info.cable_state_change) {
 		mtk_dp->train_info.cable_state_change = false;
 
-		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
-				   DP_PWR_STATE_MASK);
-		drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
+		if (!mtk_dp->train_info.cable_plugged_in) {
+			mtk_dp_video_mute(mtk_dp, true);
+
+			mtk_dp_initialize_priv_data(mtk_dp);
+			mtk_dp_set_idle_pattern(mtk_dp, true);
+			if (mtk_dp->has_fec)
+				mtk_dp_fec_enable(mtk_dp, false);
+
+			mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+					   DP_PWR_STATE_BANDGAP_TPLL,
+					   DP_PWR_STATE_MASK);
+		} else {
+			mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+					   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+					   DP_PWR_STATE_MASK);
+			drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
+		}
 	}
 
 	if (mtk_dp->train_info.irq_sta.hpd_inerrupt) {
@@ -1617,6 +1704,24 @@  static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
 	return 0;
 }
 
+static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	enum drm_connector_status ret = connector_status_disconnected;
+	u8 sink_count = 0;
+
+	if (mtk_dp_is_edp(mtk_dp))
+		return connector_status_connected;
+
+	if (mtk_dp_plug_state_avoid_pulse(mtk_dp)) {
+		drm_dp_dpcd_readb(&mtk_dp->aux, DP_SINK_COUNT, &sink_count);
+		if (DP_GET_SINK_COUNT(sink_count))
+			ret = connector_status_connected;
+	}
+
+	return ret;
+}
+
 static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 				    struct drm_connector *connector)
 {
@@ -1630,7 +1735,8 @@  static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 	drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
 	usleep_range(2000, 5000);
 
-	new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
+	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);
@@ -1989,6 +2095,7 @@  static const struct drm_bridge_funcs mtk_dp_bridge_funcs = {
 	.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)
@@ -2010,9 +2117,15 @@  static int mtk_dp_probe(struct platform_device *pdev)
 				     "failed to request dp irq resource\n");
 
 	mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
-	if (IS_ERR(mtk_dp->next_bridge))
+	if (IS_ERR(mtk_dp->next_bridge) &&
+	    PTR_ERR(mtk_dp->next_bridge) == -ENODEV) {
+		dev_info(dev,
+			 "No panel connected in devicetree, continue as external DP\n");
+		mtk_dp->next_bridge = NULL;
+	} else 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)
@@ -2055,7 +2168,10 @@  static int mtk_dp_probe(struct platform_device *pdev)
 
 	mtk_dp->bridge.ops =
 		DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
-	mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	if (mtk_dp_is_edp(mtk_dp))
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	else
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
 
 	drm_bridge_add(&mtk_dp->bridge);
 
@@ -2082,6 +2198,12 @@  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);
+		/* Ensure the sink is off before shutting down power */
+		usleep_range(2000, 3000);
+	}
+
 	mtk_dp_power_disable(mtk_dp);
 
 	mtk_dp_hwirq_enable(mtk_dp, false);
@@ -2115,6 +2237,7 @@  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" },
+	{ .compatible = "mediatek,mt8195-dp-tx" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_dp_of_match);
diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
index c9d587f1bacd..9b6f2e01391d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp_reg.h
+++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
@@ -14,6 +14,7 @@ 
 #define SEC_OFFSET	0x4000
 
 #define MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE	(BIT(0) | BIT(5))
+#define MTK_DP_SIP_ATF_VIDEO_UNMUTE	BIT(5)
 
 #define DP_PHY_GLB_BIAS_GEN_00		0
 #define RG_XTP_GLB_BIAS_INTR_CTRL	GENMASK(20, 16)