Re: [PATCH v2] drm/msm/dp: enable HDP plugin/unplugged interrupts at hpd_enable/disable

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On 22/05/2023 23:08, Kuogee Hsieh wrote:

The internal_hpd flag was introduced to handle external DP HPD derived
from GPIO pinmuxed into DP controller. HPD plug/unplug interrupts cannot
be enabled until internal_hpd flag is set to true.
At both bootup and resume time, the DP driver will enable external DP
plugin interrupts and handle plugin interrupt accordingly.




However
dp_bridge_hpd_enable() bridge ops function was called to set internal_hpd
to true later than where DP driver expected during both bootup and resume
time.


Excuse me, can't parse this.


This prevent DP driver from detecting external plugin interrupt due
to HPD related interrupts are not enabled on time. Hence external display


prevents
not being enabled


can not be lit up properly.

Move HPD related interrupts control of both enable/disable HDP hardware
block and setup individual interrupt mask bits to dp_bridge_hpd_enable()
and dp_bridge_hpd_disable().

Fixes: cd198caddea7 ("drm/msm/dp: Rely on hpd_enable/disable callbacks")
Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>


This looks pretty good to me, minor nit below.


---
  drivers/gpu/drm/msm/dp/dp_catalog.c | 19 ++++++----
  drivers/gpu/drm/msm/dp/dp_catalog.h |  2 +-
  drivers/gpu/drm/msm/dp/dp_display.c | 70 +++++++++++--------------------------
  3 files changed, 35 insertions(+), 56 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 7a8cf1c..1da711e 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -620,19 +620,26 @@ void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
  				config & DP_DP_HPD_INT_MASK);
  }
-void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog) 
+void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog, bool enable)
Could you please split it into _enable and _disable functions? Having dp_catalog_ctrl_hpd_config(.., false) doesn't sound logical. 


  {
  	struct dp_catalog_private *catalog = container_of(dp_catalog,
  				struct dp_catalog_private, dp_catalog);
u32 reftimer = dp_read_aux(catalog, REG_DP_DP_HPD_REFTIMER); - /* Configure REFTIMER and enable it */ 
-	reftimer |= DP_DP_HPD_REFTIMER_ENABLE;
-	dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
+	if (enable) {
+		/* Configure REFTIMER and enable it */
+		reftimer |= DP_DP_HPD_REFTIMER_ENABLE;
+		dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
+
+		/* Enable HPD */
+		dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
+	} else {
+		reftimer &= ~DP_DP_HPD_REFTIMER_ENABLE;
+		dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
- /* Enable HPD */ 
-	dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
+		dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, 0);
+	}
  }
static void dp_catalog_enable_sdp(struct dp_catalog_private *catalog) 
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 82376a2..818c036 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -104,7 +104,7 @@ bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog);
  void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
  void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
  			u32 intr_mask, bool en);
-void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog);
+void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog, bool enable);
  void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog);
  void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter);
  u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 3e13acdf..fee23e5 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -615,12 +615,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
  		dp->hpd_state = ST_MAINLINK_READY;
  	}
- /* enable HDP irq_hpd/replug interrupt */ 
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog,
-					   DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
-					   true);
-
  	drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
  			dp->dp_display.connector_type, state);
  	mutex_unlock(&dp->event_mutex);
@@ -658,12 +652,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
  	drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
  			dp->dp_display.connector_type, state);
- /* disable irq_hpd/replug interrupts */ 
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog,
-					   DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
-					   false);
-
  	/* unplugged, no more irq_hpd handle */
  	dp_del_event(dp, EV_IRQ_HPD_INT);
@@ -687,10 +675,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data) 
  		return 0;
  	}
- /* disable HPD plug interrupts */ 
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
-
  	/*
  	 * We don't need separate work for disconnect as
  	 * connect/attention interrupts are disabled
@@ -706,10 +690,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
  	/* signal the disconnect event early to ensure proper teardown */
  	dp_display_handle_plugged_change(&dp->dp_display, false);
- /* enable HDP plug interrupt to prepare for next plugin */ 
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
-
  	drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
  			dp->dp_display.connector_type, state);
@@ -1082,26 +1062,6 @@ void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp) 
  	mutex_unlock(&dp_display->event_mutex);
  }
-static void dp_display_config_hpd(struct dp_display_private *dp) 
-{
-
-	dp_display_host_init(dp);
-	dp_catalog_ctrl_hpd_config(dp->catalog);
-
-	/* Enable plug and unplug interrupts only if requested */
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog,
-				DP_DP_HPD_PLUG_INT_MASK |
-				DP_DP_HPD_UNPLUG_INT_MASK,
-				true);
-
-	/* Enable interrupt first time
-	 * we are leaving dp clocks on during disconnect
-	 * and never disable interrupt
-	 */
-	enable_irq(dp->irq);
-}
-
  void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
  {
  	struct dp_display_private *dp;
@@ -1176,7 +1136,7 @@ static int hpd_event_thread(void *data)
switch (todo->event_id) { 
  		case EV_HPD_INIT_SETUP:
-			dp_display_config_hpd(dp_priv);
+			dp_display_host_init(dp_priv);
  			break;
  		case EV_HPD_PLUG_INT:
  			dp_hpd_plug_handle(dp_priv, todo->data);
@@ -1394,13 +1354,8 @@ static int dp_pm_resume(struct device *dev)
  	/* turn on dp ctrl/phy */
  	dp_display_host_init(dp);
- dp_catalog_ctrl_hpd_config(dp->catalog); 
-
-	if (dp->dp_display.internal_hpd)
-		dp_catalog_hpd_config_intr(dp->catalog,
-				DP_DP_HPD_PLUG_INT_MASK |
-				DP_DP_HPD_UNPLUG_INT_MASK,
-				true);
+	if (dp_display->is_edp)
+		dp_catalog_ctrl_hpd_config(dp->catalog, true);
if (dp_catalog_link_is_connected(dp->catalog)) { 
  		/*
@@ -1568,7 +1523,7 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
if (aux_bus && dp->is_edp) { 
  		dp_display_host_init(dp_priv);
-		dp_catalog_ctrl_hpd_config(dp_priv->catalog);
+		dp_catalog_ctrl_hpd_config(dp_priv->catalog, true);
  		dp_display_host_phy_init(dp_priv);
  		enable_irq(dp_priv->irq);
@@ -1801,16 +1756,33 @@ void dp_bridge_hpd_enable(struct drm_bridge *bridge) 
  {
  	struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
  	struct msm_dp *dp_display = dp_bridge->dp_display;
+	struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
+
+	mutex_lock(&dp->event_mutex);
+	dp_catalog_ctrl_hpd_config(dp->catalog, true);
+
+	/* enable HDP interrupts */
+	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
+
+	enable_irq(dp->irq);
dp_display->internal_hpd = true; 
+	mutex_unlock(&dp->event_mutex);
  }
void dp_bridge_hpd_disable(struct drm_bridge *bridge) 
  {
  	struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
  	struct msm_dp *dp_display = dp_bridge->dp_display;
+	struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
+
+	mutex_lock(&dp->event_mutex);
+	/* disable HDP interrupts */
+	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
+	dp_catalog_ctrl_hpd_config(dp->catalog, false);
dp_display->internal_hpd = false; 
+	mutex_unlock(&dp->event_mutex);
  }
void dp_bridge_hpd_notify(struct drm_bridge *bridge, 

--
With best wishes
Dmitry
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