[PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Kuogee Hsieh]

The purpose of this patch series is to incorporate pm runtime framework
into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
driver during system probe time. During incorporating procedure, original
customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
provided by pm runtiem framework such as pm_runtime_force_suspend() and
pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
are bound at system probe time too.

Kuogee Hsieh (7):
  drm/msm/dp: tie dp_display_irq_handler() with dp driver
  drm/msm/dp: rename is_connected with link_ready
  drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes
  drm/msm/dp: move parser->parse() and dp_power_client_init() to probe
  drm/msm/dp: incorporate pm_runtime framework into DP driver
  drm/msm/dp: delete EV_HPD_INIT_SETUP
  drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()

 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c |   4 -
 drivers/gpu/drm/msm/dp/dp_aux.c         |  39 +++-
 drivers/gpu/drm/msm/dp/dp_display.c     | 333 ++++++++++++--------------------
 drivers/gpu/drm/msm/dp/dp_display.h     |   3 +-
 drivers/gpu/drm/msm/dp/dp_drm.c         |  14 +-
 drivers/gpu/drm/msm/dp/dp_power.c       |  16 --
 drivers/gpu/drm/msm/dp/dp_power.h       |  11 --
 drivers/gpu/drm/msm/msm_drv.h           |   5 -
 8 files changed, 161 insertions(+), 264 deletions(-)

-- 
2.7.4

[PATCH v7 1/7] drm/msm/dp: tie dp_display_irq_handler() with dp driver

[Kuogee Hsieh]

Currently the dp_display_request_irq() is executed at
msm_dp_modeset_init() which ties irq registering to the DPU device's
life cycle, while depending on resources that are released as the DP
device is torn down. Move register DP driver irq handler to
dp_display_probe() to have dp_display_irq_handler() IRQ tied with DP
device. In addition, use platform_get_irq() to retrieve irq number
from platform device directly.

Changes in v5:
-- reworded commit text as review comments at change #4
-- tear down component if failed at dp_display_request_irq()

Changes in v4:
-- delete dp->irq check at dp_display_request_irq()

Changes in v3:
-- move calling dp_display_irq_handler() to probe

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 32 +++++++++++++-------------------
 drivers/gpu/drm/msm/dp/dp_display.h |  1 -
 2 files changed, 13 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 76f1395..940da48 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1193,26 +1193,18 @@ static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
 	return ret;
 }
 
-int dp_display_request_irq(struct msm_dp *dp_display)
+static int dp_display_request_irq(struct dp_display_private *dp)
 {
 	int rc = 0;
-	struct dp_display_private *dp;
-
-	if (!dp_display) {
-		DRM_ERROR("invalid input\n");
-		return -EINVAL;
-	}
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
+	struct device *dev = &dp->pdev->dev;
 
-	dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
+	dp->irq = platform_get_irq(dp->pdev, 0);
 	if (!dp->irq) {
 		DRM_ERROR("failed to get irq\n");
 		return -EINVAL;
 	}
 
-	rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
-			dp_display_irq_handler,
+	rc = devm_request_irq(dev, dp->irq, dp_display_irq_handler,
 			IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
 	if (rc < 0) {
 		DRM_ERROR("failed to request IRQ%u: %d\n",
@@ -1287,13 +1279,21 @@ static int dp_display_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, &dp->dp_display);
 
+	rc = dp_display_request_irq(dp);
+	if (rc)
+		goto err;
+
 	rc = component_add(&pdev->dev, &dp_display_comp_ops);
 	if (rc) {
 		DRM_ERROR("component add failed, rc=%d\n", rc);
-		dp_display_deinit_sub_modules(dp);
+		goto err;
 	}
 
 	return rc;
+
+err:
+	dp_display_deinit_sub_modules(dp);
+	return rc;
 }
 
 static int dp_display_remove(struct platform_device *pdev)
@@ -1549,12 +1549,6 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 
 	dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
 
-	ret = dp_display_request_irq(dp_display);
-	if (ret) {
-		DRM_ERROR("request_irq failed, ret=%d\n", ret);
-		return ret;
-	}
-
 	ret = dp_display_get_next_bridge(dp_display);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index 1e9415a..b3c08de 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -35,7 +35,6 @@ struct msm_dp {
 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 		hdmi_codec_plugged_cb fn, struct device *codec_dev);
 int dp_display_get_modes(struct msm_dp *dp_display);
-int dp_display_request_irq(struct msm_dp *dp_display);
 bool dp_display_check_video_test(struct msm_dp *dp_display);
 int dp_display_get_test_bpp(struct msm_dp *dp_display);
 void dp_display_signal_audio_start(struct msm_dp *dp_display);
-- 
2.7.4

[PATCH v7 2/7] drm/msm/dp: rename is_connected with link_ready

[Kuogee Hsieh]

The is_connected flag is set to true after DP mainlink successfully
finishes link training to enter into ST_MAINLINK_READY state rather
than being set after the DP dongle is connected. Rename the
is_connected flag with link_ready flag to match the state of DP
driver's state machine.

Changes in v5:
-- reworded commit text according to review comments from change #4

Changes in v4:
-- reworded commit text

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 19 +++++++++----------
 drivers/gpu/drm/msm/dp/dp_display.h |  2 +-
 drivers/gpu/drm/msm/dp/dp_drm.c     | 14 +++++++-------
 3 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 940da48..9e51876 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -367,12 +367,11 @@ static void dp_display_send_hpd_event(struct msm_dp *dp_display)
 	drm_helper_hpd_irq_event(connector->dev);
 }
 
-
 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 					    bool hpd)
 {
-	if ((hpd && dp->dp_display.is_connected) ||
-			(!hpd && !dp->dp_display.is_connected)) {
+	if ((hpd && dp->dp_display.link_ready) ||
+			(!hpd && !dp->dp_display.link_ready)) {
 		drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
 				(hpd ? "on" : "off"));
 		return 0;
@@ -382,7 +381,7 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 	if (!hpd)
 		dp->panel->video_test = false;
 
-	dp->dp_display.is_connected = hpd;
+	dp->dp_display.link_ready = hpd;
 
 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 			dp->dp_display.connector_type, hpd);
@@ -922,7 +921,7 @@ int dp_display_set_plugged_cb(struct msm_dp *dp_display,
 
 	dp_display->plugged_cb = fn;
 	dp_display->codec_dev = codec_dev;
-	plugged = dp_display->is_connected;
+	plugged = dp_display->link_ready;
 	dp_display_handle_plugged_change(dp_display, plugged);
 
 	return 0;
@@ -1355,16 +1354,16 @@ static int dp_pm_resume(struct device *dev)
 	 * also only signal audio when disconnected
 	 */
 	if (dp->link->sink_count) {
-		dp->dp_display.is_connected = true;
+		dp->dp_display.link_ready = true;
 	} else {
-		dp->dp_display.is_connected = false;
+		dp->dp_display.link_ready = false;
 		dp_display_handle_plugged_change(dp_display, false);
 	}
 
 	drm_dbg_dp(dp->drm_dev,
 		"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
 		dp->dp_display.connector_type, dp->link->sink_count,
-		dp->dp_display.is_connected, dp->core_initialized,
+		dp->dp_display.link_ready, dp->core_initialized,
 		dp->phy_initialized, dp_display->power_on);
 
 	mutex_unlock(&dp->event_mutex);
@@ -1757,8 +1756,8 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
 		return;
 	}
 
-	if (!dp_display->is_connected && status == connector_status_connected)
+	if (!dp_display->link_ready && status == connector_status_connected)
 		dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
-	else if (dp_display->is_connected && status == connector_status_disconnected)
+	else if (dp_display->link_ready && status == connector_status_disconnected)
 		dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
 }
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index b3c08de..d65693e 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -16,7 +16,7 @@ struct msm_dp {
 	struct drm_bridge *bridge;
 	struct drm_connector *connector;
 	struct drm_bridge *next_bridge;
-	bool is_connected;
+	bool link_ready;
 	bool audio_enabled;
 	bool power_on;
 	unsigned int connector_type;
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 785d766..ee945ca 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -24,10 +24,10 @@ static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)
 
 	dp = to_dp_bridge(bridge)->dp_display;
 
-	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
-		(dp->is_connected) ? "true" : "false");
+	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
+		(dp->link_ready) ? "true" : "false");
 
-	return (dp->is_connected) ? connector_status_connected :
+	return (dp->link_ready) ? connector_status_connected :
 					connector_status_disconnected;
 }
 
@@ -40,8 +40,8 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
 
 	dp = to_dp_bridge(bridge)->dp_display;
 
-	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",
-		(dp->is_connected) ? "true" : "false");
+	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",
+		(dp->link_ready) ? "true" : "false");
 
 	/*
 	 * There is no protection in the DRM framework to check if the display
@@ -55,7 +55,7 @@ static int dp_bridge_atomic_check(struct drm_bridge *bridge,
 	 * After that this piece of code can be removed.
 	 */
 	if (bridge->ops & DRM_BRIDGE_OP_HPD)
-		return (dp->is_connected) ? 0 : -ENOTCONN;
+		return (dp->link_ready) ? 0 : -ENOTCONN;
 
 	return 0;
 }
@@ -78,7 +78,7 @@ static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *
 	dp = to_dp_bridge(bridge)->dp_display;
 
 	/* pluggable case assumes EDID is read when HPD */
-	if (dp->is_connected) {
+	if (dp->link_ready) {
 		rc = dp_display_get_modes(dp);
 		if (rc <= 0) {
 			DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);
-- 
2.7.4

[PATCH v7 3/7] drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes

[Kuogee Hsieh]

Currently DP driver use drm_helper_hpd_irq_event(), bypassing drm bridge
framework, to report HPD status changes to user space frame work.
Replace it with drm_bridge_hpd_notify() since DP driver is part of drm
bridge.

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 20 ++------------------
 1 file changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 9e51876..32663ea 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -356,26 +356,10 @@ static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
 		(dp->link->sink_count == 0);
 }
 
-static void dp_display_send_hpd_event(struct msm_dp *dp_display)
-{
-	struct dp_display_private *dp;
-	struct drm_connector *connector;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
-
-	connector = dp->dp_display.connector;
-	drm_helper_hpd_irq_event(connector->dev);
-}
-
 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 					    bool hpd)
 {
-	if ((hpd && dp->dp_display.link_ready) ||
-			(!hpd && !dp->dp_display.link_ready)) {
-		drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
-				(hpd ? "on" : "off"));
-		return 0;
-	}
+	struct drm_bridge *bridge = dp->dp_display.bridge;
 
 	/* reset video pattern flag on disconnect */
 	if (!hpd)
@@ -385,7 +369,7 @@ static int dp_display_send_hpd_notification(struct dp_display_private *dp,
 
 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 			dp->dp_display.connector_type, hpd);
-	dp_display_send_hpd_event(&dp->dp_display);
+	drm_bridge_hpd_notify(bridge, dp->dp_display.link_ready);
 
 	return 0;
 }
-- 
2.7.4

[PATCH v7 4/7] drm/msm/dp: move parser->parse() and dp_power_client_init() to probe

[Kuogee Hsieh]

Original both parser->parse() and dp_power_client_init() are done at
dp_display_bind() since eDP population is done at binding time.
In the preparation of having eDP population done at probe() time,
move both function from dp_display_bind() to dp_display_probe().

Changes in v6:
-- move dp_power_client_deinit() to remove()

Changes in v5:
-- explain why parser->parse() and dp_power_client_init() are moved to
   probe time
-- tear down sub modules if failed

Changes in v4:
-- split this patch out of "incorporate pm_runtime framework into DP
   driver" patch

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 32663ea..89fad67 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -276,11 +276,6 @@ static int dp_display_bind(struct device *dev, struct device *master,
 	dp->dp_display.drm_dev = drm;
 	priv->dp[dp->id] = &dp->dp_display;
 
-	rc = dp->parser->parse(dp->parser);
-	if (rc) {
-		DRM_ERROR("device tree parsing failed\n");
-		goto end;
-	}
 
 
 	dp->drm_dev = drm;
@@ -291,11 +286,6 @@ static int dp_display_bind(struct device *dev, struct device *master,
 		goto end;
 	}
 
-	rc = dp_power_client_init(dp->power);
-	if (rc) {
-		DRM_ERROR("Power client create failed\n");
-		goto end;
-	}
 
 	rc = dp_register_audio_driver(dev, dp->audio);
 	if (rc) {
@@ -328,7 +318,6 @@ static void dp_display_unbind(struct device *dev, struct device *master,
 
 	of_dp_aux_depopulate_bus(dp->aux);
 
-	dp_power_client_deinit(dp->power);
 	dp_unregister_audio_driver(dev, dp->audio);
 	dp_aux_unregister(dp->aux);
 	dp->drm_dev = NULL;
@@ -1250,6 +1239,18 @@ static int dp_display_probe(struct platform_device *pdev)
 		return -EPROBE_DEFER;
 	}
 
+	rc = dp->parser->parse(dp->parser);
+	if (rc) {
+		DRM_ERROR("device tree parsing failed\n");
+		goto err;
+	}
+
+	rc = dp_power_client_init(dp->power);
+	if (rc) {
+		DRM_ERROR("Power client create failed\n");
+		goto err;
+	}
+
 	/* setup event q */
 	mutex_init(&dp->event_mutex);
 	init_waitqueue_head(&dp->event_q);
@@ -1284,6 +1285,7 @@ static int dp_display_remove(struct platform_device *pdev)
 	struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
 
 	component_del(&pdev->dev, &dp_display_comp_ops);
+	dp_power_client_deinit(dp->power);
 	dp_display_deinit_sub_modules(dp);
 
 	platform_set_drvdata(pdev, NULL);
-- 
2.7.4

Re: [PATCH v7 4/7] drm/msm/dp: move parser->parse() and dp_power_client_init() to probe

[Dmitry Baryshkov]

On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
> Original both parser->parse() and dp_power_client_init() are done at
> dp_display_bind() since eDP population is done at binding time.
> In the preparation of having eDP population done at probe() time,
> move both function from dp_display_bind() to dp_display_probe().
>
> Changes in v6:
> -- move dp_power_client_deinit() to remove()
>
> Changes in v5:
> -- explain why parser->parse() and dp_power_client_init() are moved to
>    probe time
> -- tear down sub modules if failed
>
> Changes in v4:
> -- split this patch out of "incorporate pm_runtime framework into DP
>    driver" patch
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 24 +++++++++++++-----------
>  1 file changed, 13 insertions(+), 11 deletions(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

[PATCH v7 5/7] drm/msm/dp: incorporate pm_runtime framework into DP driver

[Kuogee Hsieh]

Currently DP driver is executed independent of PM runtime framework.
This leads msm eDP panel can not being detected by edp_panel driver
during generic_edp_panel_probe() due to AUX DPCD read failed at
edp panel driver. Incorporate PM runtime framework into DP driver so
that host controller's power and clocks are enable/disable through
PM runtime mechanism.  Once PM runtime framework is incorporated into
DP driver, waking up device from power up path is not necessary. Hence
remove it.

After incorporating pm_runtime framework into eDP/DP driver,
dp_pm_suspend() to handle power off both DP phy and controller during
suspend and dp_pm_resume() to handle power on both DP phy and controller
during resume are not necessary. Therefore both dp_pm_suspend() and
dp_pm_resume() are dropped and replace with dp_pm_runtime_suspend() and
dp_pm_runtime_resume() respectively.

Changes in v7:
-- add comments to dp_pm_runtime_resume()
-- add comments to dp_bridge_hpd_enable()
-- delete dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_notify()

Changes in v6:
-- delete dp_power_client_deinit(dp->power);
-- remove if (!dp->dp_display.is_edp) condition checkout at plug_handle()
-- remove if (!dp->dp_display.is_edp) condition checkout at unplug_handle()
-- add IRQF_NO_AUTOEN to devm_request_irq()
-- add enable_irq() and disable_irq() to pm_runtime_resume()/suspend()
-- del dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_disable()

Changes in v5:
-- remove pm_runtime_put_autosuspend feature, use pm_runtime_put_sync()
-- squash add pm_runtime_force_suspend()/resume() patch into this patch

Changes in v4:
-- reworded commit text to explain why pm_framework is required for
   edp panel
-- reworded commit text to explain autosuspend is choiced
-- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
-- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
-- return value from pm_runtime_resume_and_get() directly
-- check return value of devm_pm_runtime_enable()
-- delete pm_runtime_xxx from dp_display_remove()
-- drop dp_display_host_init() from EV_HPD_INIT_SETUP
-- drop both dp_pm_prepare() and dp_pm_compete() from this change
-- delete ST_SUSPENDED state
-- rewording commit text to add more details regrading the purpose
   of this change

Changes in v3:
-- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
-- use pm_runtime_resume_and_get() instead of pm_runtime_get()
-- error checking pm_runtime_resume_and_get() return value
-- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
-- replace dp_pm_suspend() with pm_runtime_force_suspend()
-- replace dp_pm_resume() with pm_runtime_force_resume()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_aux.c     |   5 +
 drivers/gpu/drm/msm/dp/dp_display.c | 177 ++++++++++++++----------------------
 drivers/gpu/drm/msm/dp/dp_power.c   |  16 ----
 drivers/gpu/drm/msm/dp/dp_power.h   |  11 ---
 4 files changed, 72 insertions(+), 137 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index 8e3b677..10b6eeb 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -291,6 +291,10 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
 		return -EINVAL;
 	}
 
+	ret = pm_runtime_resume_and_get(dp_aux->dev);
+	if (ret)
+		return  ret;
+
 	mutex_lock(&aux->mutex);
 	if (!aux->initted) {
 		ret = -EIO;
@@ -364,6 +368,7 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
 
 exit:
 	mutex_unlock(&aux->mutex);
+	pm_runtime_put_sync(dp_aux->dev);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 89fad67..acda544 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -49,7 +49,6 @@ enum {
 	ST_CONNECTED,
 	ST_DISCONNECT_PENDING,
 	ST_DISPLAY_OFF,
-	ST_SUSPENDED,
 };
 
 enum {
@@ -310,10 +309,6 @@ static void dp_display_unbind(struct device *dev, struct device *master,
 	struct dp_display_private *dp = dev_get_dp_display_private(dev);
 	struct msm_drm_private *priv = dev_get_drvdata(master);
 
-	/* disable all HPD interrupts */
-	if (dp->core_initialized)
-		dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
-
 	kthread_stop(dp->ev_tsk);
 
 	of_dp_aux_depopulate_bus(dp->aux);
@@ -558,7 +553,7 @@ static int dp_hpd_plug_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);
 
-	if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
+	if (state == ST_DISPLAY_OFF) {
 		mutex_unlock(&dp->event_mutex);
 		return 0;
 	}
@@ -575,6 +570,12 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
 		return 0;
 	}
 
+	ret = pm_runtime_resume_and_get(&dp->pdev->dev);
+	if (ret) {
+		DRM_ERROR("failed to pm_runtime_resume\n");
+		return ret;
+	}
+
 	ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
 	if (ret) {	/* link train failed */
 		dp->hpd_state = ST_DISCONNECTED;
@@ -657,6 +658,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 			dp->dp_display.connector_type, state);
 
 	/* uevent will complete disconnection part */
+	pm_runtime_put_sync(&dp->pdev->dev);
 	mutex_unlock(&dp->event_mutex);
 	return 0;
 }
@@ -672,7 +674,7 @@ static int dp_irq_hpd_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);
 
-	if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
+	if (state == ST_DISPLAY_OFF) {
 		mutex_unlock(&dp->event_mutex);
 		return 0;
 	}
@@ -1085,7 +1087,6 @@ static int hpd_event_thread(void *data)
 
 		switch (todo->event_id) {
 		case EV_HPD_INIT_SETUP:
-			dp_display_host_init(dp_priv);
 			break;
 		case EV_HPD_PLUG_INT:
 			dp_hpd_plug_handle(dp_priv, todo->data);
@@ -1177,7 +1178,9 @@ static int dp_display_request_irq(struct dp_display_private *dp)
 	}
 
 	rc = devm_request_irq(dev, dp->irq, dp_display_irq_handler,
-			IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
+			      IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
+			      "dp_display_isr", dp);
+
 	if (rc < 0) {
 		DRM_ERROR("failed to request IRQ%u: %d\n",
 				dp->irq, rc);
@@ -1263,6 +1266,10 @@ static int dp_display_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, &dp->dp_display);
 
+	rc = devm_pm_runtime_enable(&pdev->dev);
+	if (rc)
+		goto err;
+
 	rc = dp_display_request_irq(dp);
 	if (rc)
 		goto err;
@@ -1285,7 +1292,6 @@ static int dp_display_remove(struct platform_device *pdev)
 	struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
 
 	component_del(&pdev->dev, &dp_display_comp_ops);
-	dp_power_client_deinit(dp->power);
 	dp_display_deinit_sub_modules(dp);
 
 	platform_set_drvdata(pdev, NULL);
@@ -1293,109 +1299,47 @@ static int dp_display_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static int dp_pm_resume(struct device *dev)
+static int dp_pm_runtime_suspend(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_dp *dp_display = platform_get_drvdata(pdev);
-	struct dp_display_private *dp;
-	int sink_count = 0;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
-
-	mutex_lock(&dp->event_mutex);
-
-	drm_dbg_dp(dp->drm_dev,
-		"Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
-		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
-	/* start from disconnected state */
-	dp->hpd_state = ST_DISCONNECTED;
-
-	/* turn on dp ctrl/phy */
-	dp_display_host_init(dp);
-
-	if (dp_display->is_edp)
-		dp_catalog_ctrl_hpd_enable(dp->catalog);
+	struct dp_display_private *dp = dev_get_dp_display_private(dev);
 
-	if (dp_catalog_link_is_connected(dp->catalog)) {
-		/*
-		 * set sink to normal operation mode -- D0
-		 * before dpcd read
-		 */
-		dp_display_host_phy_init(dp);
-		dp_link_psm_config(dp->link, &dp->panel->link_info, false);
-		sink_count = drm_dp_read_sink_count(dp->aux);
-		if (sink_count < 0)
-			sink_count = 0;
+	disable_irq(dp->irq);
 
+	if (dp->dp_display.is_edp) {
 		dp_display_host_phy_exit(dp);
+		dp_catalog_ctrl_hpd_disable(dp->catalog);
 	}
-
-	dp->link->sink_count = sink_count;
-	/*
-	 * can not declared display is connected unless
-	 * HDMI cable is plugged in and sink_count of
-	 * dongle become 1
-	 * also only signal audio when disconnected
-	 */
-	if (dp->link->sink_count) {
-		dp->dp_display.link_ready = true;
-	} else {
-		dp->dp_display.link_ready = false;
-		dp_display_handle_plugged_change(dp_display, false);
-	}
-
-	drm_dbg_dp(dp->drm_dev,
-		"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
-		dp->dp_display.connector_type, dp->link->sink_count,
-		dp->dp_display.link_ready, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
-	mutex_unlock(&dp->event_mutex);
+	dp_display_host_deinit(dp);
 
 	return 0;
 }
 
-static int dp_pm_suspend(struct device *dev)
+static int dp_pm_runtime_resume(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct msm_dp *dp_display = platform_get_drvdata(pdev);
-	struct dp_display_private *dp;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
-
-	mutex_lock(&dp->event_mutex);
-
-	drm_dbg_dp(dp->drm_dev,
-		"Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
-		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
-
-	/* mainlink enabled */
-	if (dp_power_clk_status(dp->power, DP_CTRL_PM))
-		dp_ctrl_off_link_stream(dp->ctrl);
-
-	dp_display_host_phy_exit(dp);
-
-	/* host_init will be called at pm_resume */
-	dp_display_host_deinit(dp);
-
-	dp->hpd_state = ST_SUSPENDED;
-
-	drm_dbg_dp(dp->drm_dev,
-		"After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
-		dp->dp_display.connector_type, dp->core_initialized,
-		dp->phy_initialized, dp_display->power_on);
+	struct dp_display_private *dp = dev_get_dp_display_private(dev);
 
-	mutex_unlock(&dp->event_mutex);
+	/*
+	 * for eDP, host cotroller, HPD block and PHY are enabled here
+	 * but with HPD irq disabled
+	 *
+	 * for DP, only host controller is enabled here.
+	 * HPD block is enabled at dp_bridge_hpd_enable()
+	 * PHY will be enabled at plugin handler later
+	 */
+	dp_display_host_init(dp);
+	if (dp->dp_display.is_edp) {
+		dp_catalog_ctrl_hpd_enable(dp->catalog);
+		dp_display_host_phy_init(dp);
+	}
 
+	enable_irq(dp->irq);
 	return 0;
 }
 
 static const struct dev_pm_ops dp_pm_ops = {
-	.suspend = dp_pm_suspend,
-	.resume =  dp_pm_resume,
+	SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 static struct platform_driver dp_display_driver = {
@@ -1478,10 +1422,6 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
 	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
 
 	if (aux_bus && dp->is_edp) {
-		dp_display_host_init(dp_priv);
-		dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
-		dp_display_host_phy_init(dp_priv);
-
 		/*
 		 * The code below assumes that the panel will finish probing
 		 * by the time devm_of_dp_aux_populate_ep_devices() returns.
@@ -1583,6 +1523,11 @@ void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
 		dp_hpd_plug_handle(dp_display, 0);
 
 	mutex_lock(&dp_display->event_mutex);
+	if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
+		DRM_ERROR("failed to pm_runtime_resume\n");
+		mutex_unlock(&dp_display->event_mutex);
+		return;
+	}
 
 	state = dp_display->hpd_state;
 	if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
@@ -1647,10 +1592,9 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
 	mutex_lock(&dp_display->event_mutex);
 
 	state = dp_display->hpd_state;
-	if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
-		mutex_unlock(&dp_display->event_mutex);
-		return;
-	}
+	if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
+		drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
+			   dp->connector_type, state);
 
 	dp_display_disable(dp_display);
 
@@ -1663,6 +1607,8 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
 	}
 
 	drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
+
+	pm_runtime_put_sync(&dp_display->pdev->dev);
 	mutex_unlock(&dp_display->event_mutex);
 }
 
@@ -1701,7 +1647,21 @@ void dp_bridge_hpd_enable(struct drm_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);
 
+	/*
+	 * this is for external DP with hpd irq enabled case,
+	 * step-1: dp_pm_runtime_resume() enable dp host only
+	 * step-2: enable hdp block and have hpd irq enabled here
+	 * step-3: waiting for plugin irq while phy is not initialized
+	 * step-4: DP PHY is initialized at plugin handler before link training
+	 *
+	 */
 	mutex_lock(&dp->event_mutex);
+	if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
+		DRM_ERROR("failed to resume power\n");
+		mutex_unlock(&dp->event_mutex);
+		return;
+	}
+
 	dp_catalog_ctrl_hpd_enable(dp->catalog);
 
 	/* enable HDP interrupts */
@@ -1723,6 +1683,8 @@ void dp_bridge_hpd_disable(struct drm_bridge *bridge)
 	dp_catalog_ctrl_hpd_disable(dp->catalog);
 
 	dp_display->internal_hpd = false;
+
+	pm_runtime_put_sync(&dp->pdev->dev);
 	mutex_unlock(&dp->event_mutex);
 }
 
@@ -1737,11 +1699,6 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
 	if (dp_display->internal_hpd)
 		return;
 
-	if (!dp->core_initialized) {
-		drm_dbg_dp(dp->drm_dev, "not initialized\n");
-		return;
-	}
-
 	if (!dp_display->link_ready && status == connector_status_connected)
 		dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
 	else if (dp_display->link_ready && status == connector_status_disconnected)
diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c
index 5cb84ca..863c766 100644
--- a/drivers/gpu/drm/msm/dp/dp_power.c
+++ b/drivers/gpu/drm/msm/dp/dp_power.c
@@ -152,20 +152,9 @@ int dp_power_client_init(struct dp_power *dp_power)
 
 	power = container_of(dp_power, struct dp_power_private, dp_power);
 
-	pm_runtime_enable(power->dev);
-
 	return dp_power_clk_init(power);
 }
 
-void dp_power_client_deinit(struct dp_power *dp_power)
-{
-	struct dp_power_private *power;
-
-	power = container_of(dp_power, struct dp_power_private, dp_power);
-
-	pm_runtime_disable(power->dev);
-}
-
 int dp_power_init(struct dp_power *dp_power)
 {
 	int rc = 0;
@@ -173,11 +162,7 @@ int dp_power_init(struct dp_power *dp_power)
 
 	power = container_of(dp_power, struct dp_power_private, dp_power);
 
-	pm_runtime_get_sync(power->dev);
-
 	rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
-	if (rc)
-		pm_runtime_put_sync(power->dev);
 
 	return rc;
 }
@@ -189,7 +174,6 @@ int dp_power_deinit(struct dp_power *dp_power)
 	power = container_of(dp_power, struct dp_power_private, dp_power);
 
 	dp_power_clk_enable(dp_power, DP_CORE_PM, false);
-	pm_runtime_put_sync(power->dev);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_power.h b/drivers/gpu/drm/msm/dp/dp_power.h
index a3dec20..55ada51 100644
--- a/drivers/gpu/drm/msm/dp/dp_power.h
+++ b/drivers/gpu/drm/msm/dp/dp_power.h
@@ -81,17 +81,6 @@ int dp_power_clk_enable(struct dp_power *power, enum dp_pm_type pm_type,
 int dp_power_client_init(struct dp_power *power);
 
 /**
- * dp_power_clinet_deinit() - de-initialize clock and regulator modules
- *
- * @power: instance of power module
- * return: 0 for success, error for failure.
- *
- * This API will de-initialize the DisplayPort's clocks and regulator
- * modules.
- */
-void dp_power_client_deinit(struct dp_power *power);
-
-/**
  * dp_power_get() - configure and get the DisplayPort power module data
  *
  * @parser: instance of parser module
-- 
2.7.4

Re: [PATCH v7 5/7] drm/msm/dp: incorporate pm_runtime framework into DP driver

[Dmitry Baryshkov]

On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
> Currently DP driver is executed independent of PM runtime framework.
> This leads msm eDP panel can not being detected by edp_panel driver
> during generic_edp_panel_probe() due to AUX DPCD read failed at
> edp panel driver. Incorporate PM runtime framework into DP driver so
> that host controller's power and clocks are enable/disable through
> PM runtime mechanism.  Once PM runtime framework is incorporated into
> DP driver, waking up device from power up path is not necessary. Hence
> remove it.
>
> After incorporating pm_runtime framework into eDP/DP driver,
> dp_pm_suspend() to handle power off both DP phy and controller during
> suspend and dp_pm_resume() to handle power on both DP phy and controller
> during resume are not necessary. Therefore both dp_pm_suspend() and
> dp_pm_resume() are dropped and replace with dp_pm_runtime_suspend() and
> dp_pm_runtime_resume() respectively.
>
> Changes in v7:
> -- add comments to dp_pm_runtime_resume()
> -- add comments to dp_bridge_hpd_enable()
> -- delete dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_notify()
>
> Changes in v6:
> -- delete dp_power_client_deinit(dp->power);
> -- remove if (!dp->dp_display.is_edp) condition checkout at plug_handle()
> -- remove if (!dp->dp_display.is_edp) condition checkout at unplug_handle()
> -- add IRQF_NO_AUTOEN to devm_request_irq()
> -- add enable_irq() and disable_irq() to pm_runtime_resume()/suspend()
> -- del dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_disable()
>
> Changes in v5:
> -- remove pm_runtime_put_autosuspend feature, use pm_runtime_put_sync()
> -- squash add pm_runtime_force_suspend()/resume() patch into this patch
>
> Changes in v4:
> -- reworded commit text to explain why pm_framework is required for
>    edp panel
> -- reworded commit text to explain autosuspend is choiced
> -- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
> -- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
> -- return value from pm_runtime_resume_and_get() directly
> -- check return value of devm_pm_runtime_enable()
> -- delete pm_runtime_xxx from dp_display_remove()
> -- drop dp_display_host_init() from EV_HPD_INIT_SETUP
> -- drop both dp_pm_prepare() and dp_pm_compete() from this change
> -- delete ST_SUSPENDED state
> -- rewording commit text to add more details regrading the purpose
>    of this change
>
> Changes in v3:
> -- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
> -- use pm_runtime_resume_and_get() instead of pm_runtime_get()
> -- error checking pm_runtime_resume_and_get() return value
> -- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
> -- replace dp_pm_suspend() with pm_runtime_force_suspend()
> -- replace dp_pm_resume() with pm_runtime_force_resume()
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

> ---
>  drivers/gpu/drm/msm/dp/dp_aux.c     |   5 +
>  drivers/gpu/drm/msm/dp/dp_display.c | 177 ++++++++++++++----------------------
>  drivers/gpu/drm/msm/dp/dp_power.c   |  16 ----
>  drivers/gpu/drm/msm/dp/dp_power.h   |  11 ---
>  4 files changed, 72 insertions(+), 137 deletions(-)


-- 
With best wishes
Dmitry

Re: [PATCH v7 5/7] drm/msm/dp: incorporate pm_runtime framework into DP driver

[Dmitry Baryshkov]

On 07/10/2023 01:55, Kuogee Hsieh wrote:
> Currently DP driver is executed independent of PM runtime framework.
> This leads msm eDP panel can not being detected by edp_panel driver
> during generic_edp_panel_probe() due to AUX DPCD read failed at
> edp panel driver. Incorporate PM runtime framework into DP driver so
> that host controller's power and clocks are enable/disable through
> PM runtime mechanism.  Once PM runtime framework is incorporated into
> DP driver, waking up device from power up path is not necessary. Hence
> remove it.
> 
> After incorporating pm_runtime framework into eDP/DP driver,
> dp_pm_suspend() to handle power off both DP phy and controller during
> suspend and dp_pm_resume() to handle power on both DP phy and controller
> during resume are not necessary. Therefore both dp_pm_suspend() and
> dp_pm_resume() are dropped and replace with dp_pm_runtime_suspend() and
> dp_pm_runtime_resume() respectively.
> 
> Changes in v7:
> -- add comments to dp_pm_runtime_resume()
> -- add comments to dp_bridge_hpd_enable()
> -- delete dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_notify()
> 
> Changes in v6:
> -- delete dp_power_client_deinit(dp->power);
> -- remove if (!dp->dp_display.is_edp) condition checkout at plug_handle()
> -- remove if (!dp->dp_display.is_edp) condition checkout at unplug_handle()
> -- add IRQF_NO_AUTOEN to devm_request_irq()
> -- add enable_irq() and disable_irq() to pm_runtime_resume()/suspend()
> -- del dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_disable()
> 
> Changes in v5:
> -- remove pm_runtime_put_autosuspend feature, use pm_runtime_put_sync()
> -- squash add pm_runtime_force_suspend()/resume() patch into this patch
> 
> Changes in v4:
> -- reworded commit text to explain why pm_framework is required for
>     edp panel
> -- reworded commit text to explain autosuspend is choiced
> -- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
> -- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
> -- return value from pm_runtime_resume_and_get() directly
> -- check return value of devm_pm_runtime_enable()
> -- delete pm_runtime_xxx from dp_display_remove()
> -- drop dp_display_host_init() from EV_HPD_INIT_SETUP
> -- drop both dp_pm_prepare() and dp_pm_compete() from this change
> -- delete ST_SUSPENDED state
> -- rewording commit text to add more details regrading the purpose
>     of this change
> 
> Changes in v3:
> -- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
> -- use pm_runtime_resume_and_get() instead of pm_runtime_get()
> -- error checking pm_runtime_resume_and_get() return value
> -- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
> -- replace dp_pm_suspend() with pm_runtime_force_suspend()
> -- replace dp_pm_resume() with pm_runtime_force_resume()
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/dp/dp_aux.c     |   5 +
>   drivers/gpu/drm/msm/dp/dp_display.c | 177 ++++++++++++++----------------------
>   drivers/gpu/drm/msm/dp/dp_power.c   |  16 ----
>   drivers/gpu/drm/msm/dp/dp_power.h   |  11 ---
>   4 files changed, 72 insertions(+), 137 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
> index 8e3b677..10b6eeb 100644
> --- a/drivers/gpu/drm/msm/dp/dp_aux.c
> +++ b/drivers/gpu/drm/msm/dp/dp_aux.c
> @@ -291,6 +291,10 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
>   		return -EINVAL;
>   	}
>   
> +	ret = pm_runtime_resume_and_get(dp_aux->dev);
> +	if (ret)
> +		return  ret;
> +
>   	mutex_lock(&aux->mutex);
>   	if (!aux->initted) {
>   		ret = -EIO;
> @@ -364,6 +368,7 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
>   
>   exit:
>   	mutex_unlock(&aux->mutex);
> +	pm_runtime_put_sync(dp_aux->dev);
>   
>   	return ret;
>   }
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 89fad67..acda544 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -49,7 +49,6 @@ enum {
>   	ST_CONNECTED,
>   	ST_DISCONNECT_PENDING,
>   	ST_DISPLAY_OFF,
> -	ST_SUSPENDED,
>   };
>   
>   enum {
> @@ -310,10 +309,6 @@ static void dp_display_unbind(struct device *dev, struct device *master,
>   	struct dp_display_private *dp = dev_get_dp_display_private(dev);
>   	struct msm_drm_private *priv = dev_get_drvdata(master);
>   
> -	/* disable all HPD interrupts */
> -	if (dp->core_initialized)
> -		dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> -
>   	kthread_stop(dp->ev_tsk);
>   
>   	of_dp_aux_depopulate_bus(dp->aux);
> @@ -558,7 +553,7 @@ static int dp_hpd_plug_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);
>   
> -	if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
> +	if (state == ST_DISPLAY_OFF) {
>   		mutex_unlock(&dp->event_mutex);
>   		return 0;
>   	}
> @@ -575,6 +570,12 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
>   		return 0;
>   	}
>   
> +	ret = pm_runtime_resume_and_get(&dp->pdev->dev);
> +	if (ret) {
> +		DRM_ERROR("failed to pm_runtime_resume\n");
> +		return ret;
> +	}
> +
>   	ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
>   	if (ret) {	/* link train failed */
>   		dp->hpd_state = ST_DISCONNECTED;
> @@ -657,6 +658,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
>   			dp->dp_display.connector_type, state);
>   
>   	/* uevent will complete disconnection part */
> +	pm_runtime_put_sync(&dp->pdev->dev);
>   	mutex_unlock(&dp->event_mutex);
>   	return 0;
>   }
> @@ -672,7 +674,7 @@ static int dp_irq_hpd_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);
>   
> -	if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
> +	if (state == ST_DISPLAY_OFF) {
>   		mutex_unlock(&dp->event_mutex);
>   		return 0;
>   	}
> @@ -1085,7 +1087,6 @@ static int hpd_event_thread(void *data)
>   
>   		switch (todo->event_id) {
>   		case EV_HPD_INIT_SETUP:
> -			dp_display_host_init(dp_priv);
>   			break;
>   		case EV_HPD_PLUG_INT:
>   			dp_hpd_plug_handle(dp_priv, todo->data);
> @@ -1177,7 +1178,9 @@ static int dp_display_request_irq(struct dp_display_private *dp)
>   	}
>   
>   	rc = devm_request_irq(dev, dp->irq, dp_display_irq_handler,
> -			IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
> +			      IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
> +			      "dp_display_isr", dp);
> +
>   	if (rc < 0) {
>   		DRM_ERROR("failed to request IRQ%u: %d\n",
>   				dp->irq, rc);
> @@ -1263,6 +1266,10 @@ static int dp_display_probe(struct platform_device *pdev)
>   
>   	platform_set_drvdata(pdev, &dp->dp_display);
>   
> +	rc = devm_pm_runtime_enable(&pdev->dev);
> +	if (rc)
> +		goto err;
> +
>   	rc = dp_display_request_irq(dp);
>   	if (rc)
>   		goto err;
> @@ -1285,7 +1292,6 @@ static int dp_display_remove(struct platform_device *pdev)
>   	struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
>   
>   	component_del(&pdev->dev, &dp_display_comp_ops);
> -	dp_power_client_deinit(dp->power);
>   	dp_display_deinit_sub_modules(dp);
>   
>   	platform_set_drvdata(pdev, NULL);
> @@ -1293,109 +1299,47 @@ static int dp_display_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -static int dp_pm_resume(struct device *dev)
> +static int dp_pm_runtime_suspend(struct device *dev)
>   {
> -	struct platform_device *pdev = to_platform_device(dev);
> -	struct msm_dp *dp_display = platform_get_drvdata(pdev);
> -	struct dp_display_private *dp;
> -	int sink_count = 0;
> -
> -	dp = container_of(dp_display, struct dp_display_private, dp_display);
> -
> -	mutex_lock(&dp->event_mutex);
> -
> -	drm_dbg_dp(dp->drm_dev,
> -		"Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> -		dp->dp_display.connector_type, dp->core_initialized,
> -		dp->phy_initialized, dp_display->power_on);
> -
> -	/* start from disconnected state */
> -	dp->hpd_state = ST_DISCONNECTED;
> -
> -	/* turn on dp ctrl/phy */
> -	dp_display_host_init(dp);
> -
> -	if (dp_display->is_edp)
> -		dp_catalog_ctrl_hpd_enable(dp->catalog);
> +	struct dp_display_private *dp = dev_get_dp_display_private(dev);
>   
> -	if (dp_catalog_link_is_connected(dp->catalog)) {
> -		/*
> -		 * set sink to normal operation mode -- D0
> -		 * before dpcd read
> -		 */
> -		dp_display_host_phy_init(dp);
> -		dp_link_psm_config(dp->link, &dp->panel->link_info, false);
> -		sink_count = drm_dp_read_sink_count(dp->aux);
> -		if (sink_count < 0)
> -			sink_count = 0;
> +	disable_irq(dp->irq);
>   
> +	if (dp->dp_display.is_edp) {
>   		dp_display_host_phy_exit(dp);
> +		dp_catalog_ctrl_hpd_disable(dp->catalog);
>   	}
> -
> -	dp->link->sink_count = sink_count;
> -	/*
> -	 * can not declared display is connected unless
> -	 * HDMI cable is plugged in and sink_count of
> -	 * dongle become 1
> -	 * also only signal audio when disconnected
> -	 */
> -	if (dp->link->sink_count) {
> -		dp->dp_display.link_ready = true;
> -	} else {
> -		dp->dp_display.link_ready = false;
> -		dp_display_handle_plugged_change(dp_display, false);
> -	}
> -
> -	drm_dbg_dp(dp->drm_dev,
> -		"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
> -		dp->dp_display.connector_type, dp->link->sink_count,
> -		dp->dp_display.link_ready, dp->core_initialized,
> -		dp->phy_initialized, dp_display->power_on);
> -
> -	mutex_unlock(&dp->event_mutex);
> +	dp_display_host_deinit(dp);
>   
>   	return 0;
>   }
>   
> -static int dp_pm_suspend(struct device *dev)
> +static int dp_pm_runtime_resume(struct device *dev)
>   {
> -	struct platform_device *pdev = to_platform_device(dev);
> -	struct msm_dp *dp_display = platform_get_drvdata(pdev);
> -	struct dp_display_private *dp;
> -
> -	dp = container_of(dp_display, struct dp_display_private, dp_display);
> -
> -	mutex_lock(&dp->event_mutex);
> -
> -	drm_dbg_dp(dp->drm_dev,
> -		"Before, type=%d core_inited=%d  phy_inited=%d power_on=%d\n",
> -		dp->dp_display.connector_type, dp->core_initialized,
> -		dp->phy_initialized, dp_display->power_on);
> -
> -	/* mainlink enabled */
> -	if (dp_power_clk_status(dp->power, DP_CTRL_PM))
> -		dp_ctrl_off_link_stream(dp->ctrl);
> -
> -	dp_display_host_phy_exit(dp);
> -
> -	/* host_init will be called at pm_resume */
> -	dp_display_host_deinit(dp);
> -
> -	dp->hpd_state = ST_SUSPENDED;
> -
> -	drm_dbg_dp(dp->drm_dev,
> -		"After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> -		dp->dp_display.connector_type, dp->core_initialized,
> -		dp->phy_initialized, dp_display->power_on);
> +	struct dp_display_private *dp = dev_get_dp_display_private(dev);
>   
> -	mutex_unlock(&dp->event_mutex);
> +	/*
> +	 * for eDP, host cotroller, HPD block and PHY are enabled here
> +	 * but with HPD irq disabled
> +	 *
> +	 * for DP, only host controller is enabled here.
> +	 * HPD block is enabled at dp_bridge_hpd_enable()
> +	 * PHY will be enabled at plugin handler later
> +	 */
> +	dp_display_host_init(dp);
> +	if (dp->dp_display.is_edp) {
> +		dp_catalog_ctrl_hpd_enable(dp->catalog);
> +		dp_display_host_phy_init(dp);
> +	}
>   
> +	enable_irq(dp->irq);
>   	return 0;
>   }
>   
>   static const struct dev_pm_ops dp_pm_ops = {
> -	.suspend = dp_pm_suspend,
> -	.resume =  dp_pm_resume,
> +	SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				pm_runtime_force_resume)
>   };
>   
>   static struct platform_driver dp_display_driver = {
> @@ -1478,10 +1422,6 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
>   	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
>   
>   	if (aux_bus && dp->is_edp) {
> -		dp_display_host_init(dp_priv);
> -		dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
> -		dp_display_host_phy_init(dp_priv);
> -
>   		/*
>   		 * The code below assumes that the panel will finish probing
>   		 * by the time devm_of_dp_aux_populate_ep_devices() returns.
> @@ -1583,6 +1523,11 @@ void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
>   		dp_hpd_plug_handle(dp_display, 0);
>   
>   	mutex_lock(&dp_display->event_mutex);
> +	if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
> +		DRM_ERROR("failed to pm_runtime_resume\n");
> +		mutex_unlock(&dp_display->event_mutex);
> +		return;
> +	}
>   
>   	state = dp_display->hpd_state;
>   	if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
> @@ -1647,10 +1592,9 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
>   	mutex_lock(&dp_display->event_mutex);
>   
>   	state = dp_display->hpd_state;
> -	if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
> -		mutex_unlock(&dp_display->event_mutex);
> -		return;
> -	}
> +	if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
> +		drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
> +			   dp->connector_type, state);
>   
>   	dp_display_disable(dp_display);
>   
> @@ -1663,6 +1607,8 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
>   	}
>   
>   	drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
> +
> +	pm_runtime_put_sync(&dp_display->pdev->dev);
>   	mutex_unlock(&dp_display->event_mutex);
>   }
>   
> @@ -1701,7 +1647,21 @@ void dp_bridge_hpd_enable(struct drm_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);
>   
> +	/*
> +	 * this is for external DP with hpd irq enabled case,
> +	 * step-1: dp_pm_runtime_resume() enable dp host only
> +	 * step-2: enable hdp block and have hpd irq enabled here
> +	 * step-3: waiting for plugin irq while phy is not initialized
> +	 * step-4: DP PHY is initialized at plugin handler before link training
> +	 *
> +	 */
>   	mutex_lock(&dp->event_mutex);
> +	if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
> +		DRM_ERROR("failed to resume power\n");
> +		mutex_unlock(&dp->event_mutex);
> +		return;
> +	}
> +
>   	dp_catalog_ctrl_hpd_enable(dp->catalog);
>   
>   	/* enable HDP interrupts */
> @@ -1723,6 +1683,8 @@ void dp_bridge_hpd_disable(struct drm_bridge *bridge)
>   	dp_catalog_ctrl_hpd_disable(dp->catalog);
>   
>   	dp_display->internal_hpd = false;
> +
> +	pm_runtime_put_sync(&dp->pdev->dev);
>   	mutex_unlock(&dp->event_mutex);
>   }
>   
> @@ -1737,11 +1699,6 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
>   	if (dp_display->internal_hpd)
>   		return;
>   
> -	if (!dp->core_initialized) {
> -		drm_dbg_dp(dp->drm_dev, "not initialized\n");
> -		return;
> -	}
> -
>   	if (!dp_display->link_ready && status == connector_status_connected)
>   		dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
>   	else if (dp_display->link_ready && status == connector_status_disconnected)
> diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c
> index 5cb84ca..863c766 100644
> --- a/drivers/gpu/drm/msm/dp/dp_power.c
> +++ b/drivers/gpu/drm/msm/dp/dp_power.c
> @@ -152,20 +152,9 @@ int dp_power_client_init(struct dp_power *dp_power)
>   
>   	power = container_of(dp_power, struct dp_power_private, dp_power);
>   
> -	pm_runtime_enable(power->dev);
> -
>   	return dp_power_clk_init(power);
>   }
>   
> -void dp_power_client_deinit(struct dp_power *dp_power)
> -{
> -	struct dp_power_private *power;
> -
> -	power = container_of(dp_power, struct dp_power_private, dp_power);
> -
> -	pm_runtime_disable(power->dev);
> -}
> -
>   int dp_power_init(struct dp_power *dp_power)
>   {
>   	int rc = 0;
> @@ -173,11 +162,7 @@ int dp_power_init(struct dp_power *dp_power)
>   
>   	power = container_of(dp_power, struct dp_power_private, dp_power);
>   
> -	pm_runtime_get_sync(power->dev); 

With W=1 I'm getting the following warnings:

drivers/gpu/drm/msm/dp/dp_power.c: In function ‘dp_power_init’:
drivers/gpu/drm/msm/dp/dp_power.c:161:34: warning: variable ‘power’ set 
but not used [-Wunused-but-set-variable]

> -
>   	rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
> -	if (rc)
> -		pm_runtime_put_sync(power->dev);
>   
>   	return rc;
>   }
> @@ -189,7 +174,6 @@ int dp_power_deinit(struct dp_power *dp_power)
>   	power = container_of(dp_power, struct dp_power_private, dp_power);
>   
>   	dp_power_clk_enable(dp_power, DP_CORE_PM, false);
> -	pm_runtime_put_sync(power->dev);

drivers/gpu/drm/msm/dp/dp_power.c: In function ‘dp_power_deinit’:
drivers/gpu/drm/msm/dp/dp_power.c:172:34: warning: variable ‘power’ set 
but not used [-Wunused-but-set-variable]


>   	return 0;
>   }
>   
> diff --git a/drivers/gpu/drm/msm/dp/dp_power.h b/drivers/gpu/drm/msm/dp/dp_power.h
> index a3dec20..55ada51 100644
> --- a/drivers/gpu/drm/msm/dp/dp_power.h
> +++ b/drivers/gpu/drm/msm/dp/dp_power.h
> @@ -81,17 +81,6 @@ int dp_power_clk_enable(struct dp_power *power, enum dp_pm_type pm_type,
>   int dp_power_client_init(struct dp_power *power);
>   
>   /**
> - * dp_power_clinet_deinit() - de-initialize clock and regulator modules
> - *
> - * @power: instance of power module
> - * return: 0 for success, error for failure.
> - *
> - * This API will de-initialize the DisplayPort's clocks and regulator
> - * modules.
> - */
> -void dp_power_client_deinit(struct dp_power *power);
> -
> -/**
>    * dp_power_get() - configure and get the DisplayPort power module data
>    *
>    * @parser: instance of parser module

-- 
With best wishes
Dmitry

Re: [PATCH v7 5/7] drm/msm/dp: incorporate pm_runtime framework into DP driver

[Dmitry Baryshkov]

On 07/10/2023 01:55, Kuogee Hsieh wrote:
> Currently DP driver is executed independent of PM runtime framework.
> This leads msm eDP panel can not being detected by edp_panel driver
> during generic_edp_panel_probe() due to AUX DPCD read failed at
> edp panel driver. Incorporate PM runtime framework into DP driver so
> that host controller's power and clocks are enable/disable through
> PM runtime mechanism.  Once PM runtime framework is incorporated into
> DP driver, waking up device from power up path is not necessary. Hence
> remove it.
> 
> After incorporating pm_runtime framework into eDP/DP driver,
> dp_pm_suspend() to handle power off both DP phy and controller during
> suspend and dp_pm_resume() to handle power on both DP phy and controller
> during resume are not necessary. Therefore both dp_pm_suspend() and
> dp_pm_resume() are dropped and replace with dp_pm_runtime_suspend() and
> dp_pm_runtime_resume() respectively.
> 
> Changes in v7:
> -- add comments to dp_pm_runtime_resume()
> -- add comments to dp_bridge_hpd_enable()
> -- delete dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_notify()
> 
> Changes in v6:
> -- delete dp_power_client_deinit(dp->power);
> -- remove if (!dp->dp_display.is_edp) condition checkout at plug_handle()
> -- remove if (!dp->dp_display.is_edp) condition checkout at unplug_handle()
> -- add IRQF_NO_AUTOEN to devm_request_irq()
> -- add enable_irq() and disable_irq() to pm_runtime_resume()/suspend()
> -- del dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_disable()
> 
> Changes in v5:
> -- remove pm_runtime_put_autosuspend feature, use pm_runtime_put_sync()
> -- squash add pm_runtime_force_suspend()/resume() patch into this patch
> 
> Changes in v4:
> -- reworded commit text to explain why pm_framework is required for
>     edp panel
> -- reworded commit text to explain autosuspend is choiced
> -- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
> -- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
> -- return value from pm_runtime_resume_and_get() directly
> -- check return value of devm_pm_runtime_enable()
> -- delete pm_runtime_xxx from dp_display_remove()
> -- drop dp_display_host_init() from EV_HPD_INIT_SETUP
> -- drop both dp_pm_prepare() and dp_pm_compete() from this change
> -- delete ST_SUSPENDED state
> -- rewording commit text to add more details regrading the purpose
>     of this change
> 
> Changes in v3:
> -- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
> -- use pm_runtime_resume_and_get() instead of pm_runtime_get()
> -- error checking pm_runtime_resume_and_get() return value
> -- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
> -- replace dp_pm_suspend() with pm_runtime_force_suspend()
> -- replace dp_pm_resume() with pm_runtime_force_resume()
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>   drivers/gpu/drm/msm/dp/dp_aux.c     |   5 +
>   drivers/gpu/drm/msm/dp/dp_display.c | 177 ++++++++++++++----------------------
>   drivers/gpu/drm/msm/dp/dp_power.c   |  16 ----
>   drivers/gpu/drm/msm/dp/dp_power.h   |  11 ---
>   4 files changed, 72 insertions(+), 137 deletions(-)


[skipped the rest]

> @@ -173,11 +162,7 @@ int dp_power_init(struct dp_power *dp_power)
>   
>   	power = container_of(dp_power, struct dp_power_private, dp_power);
>   
> -	pm_runtime_get_sync(power->dev);
> -
>   	rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
> -	if (rc)
> -		pm_runtime_put_sync(power->dev);
>   
>   	return rc;

Also this can not be as simple as:

int dp_power_init(struct dp_power *dp_power)
{
   	return dp_power_clk_enable(dp_power, DP_CORE_PM, true);
}


>   }-- 
With best wishes
Dmitry

[PATCH v7 6/7] drm/msm/dp: delete EV_HPD_INIT_SETUP

[Kuogee Hsieh]

EV_HPD_INIT_SETUP flag is used to trigger the initialization of external
DP host controller. Since external DP host controller initialization had
been incorporated into pm_runtime_resume(), this flag became obsolete.
msm_dp_irq_postinstall() which triggers EV_HPD_INIT_SETUP event is
obsoleted accordingly.

Changes in v4:
-- reworded commit text
-- drop EV_HPD_INIT_SETUP
-- drop msm_dp_irq_postinstall()

Changes in v3:
-- drop EV_HPD_INIT_SETUP and msm_dp_irq_postinstall()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c |  4 ----
 drivers/gpu/drm/msm/dp/dp_display.c     | 16 ----------------
 drivers/gpu/drm/msm/msm_drv.h           |  5 -----
 3 files changed, 25 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index aa6ba2c..146f263 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -869,7 +869,6 @@ static int dpu_irq_postinstall(struct msm_kms *kms)
 {
 	struct msm_drm_private *priv;
 	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
-	int i;
 
 	if (!dpu_kms || !dpu_kms->dev)
 		return -EINVAL;
@@ -878,9 +877,6 @@ static int dpu_irq_postinstall(struct msm_kms *kms)
 	if (!priv)
 		return -EINVAL;
 
-	for (i = 0; i < ARRAY_SIZE(priv->dp); i++)
-		msm_dp_irq_postinstall(priv->dp[i]);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index acda544..057c4451 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -54,7 +54,6 @@ enum {
 enum {
 	EV_NO_EVENT,
 	/* hpd events */
-	EV_HPD_INIT_SETUP,
 	EV_HPD_PLUG_INT,
 	EV_IRQ_HPD_INT,
 	EV_HPD_UNPLUG_INT,
@@ -1086,8 +1085,6 @@ static int hpd_event_thread(void *data)
 		spin_unlock_irqrestore(&dp_priv->event_lock, flag);
 
 		switch (todo->event_id) {
-		case EV_HPD_INIT_SETUP:
-			break;
 		case EV_HPD_PLUG_INT:
 			dp_hpd_plug_handle(dp_priv, todo->data);
 			break;
@@ -1369,19 +1366,6 @@ void __exit msm_dp_unregister(void)
 	platform_driver_unregister(&dp_display_driver);
 }
 
-void msm_dp_irq_postinstall(struct msm_dp *dp_display)
-{
-	struct dp_display_private *dp;
-
-	if (!dp_display)
-		return;
-
-	dp = container_of(dp_display, struct dp_display_private, dp_display);
-
-	if (!dp_display->is_edp)
-		dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
-}
-
 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
 {
 	struct dp_display_private *dp;
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 02fd6c7..30723da 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -384,7 +384,6 @@ int __init msm_dp_register(void);
 void __exit msm_dp_unregister(void);
 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 			 struct drm_encoder *encoder);
-void msm_dp_irq_postinstall(struct msm_dp *dp_display);
 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
 
 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor);
@@ -405,10 +404,6 @@ static inline int msm_dp_modeset_init(struct msm_dp *dp_display,
 	return -EINVAL;
 }
 
-static inline void msm_dp_irq_postinstall(struct msm_dp *dp_display)
-{
-}
-
 static inline void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display)
 {
 }
-- 
2.7.4

[PATCH v7 7/7] drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()

[Kuogee Hsieh]

Currently eDP population is done at msm_dp_modeset_init() which happen
at binding time. Move eDP population to be done at display probe time
so that probe deferral cases can be handled effectively.
wait_for_hpd_asserted callback is added during drm_dp_aux_init()
to ensure eDP's HPD is up before proceeding eDP population.

Changes in v5:
-- inline dp_display_auxbus_population() and delete it

Changes in v4:
-- delete duplicate initialize code to dp_aux before drm_dp_aux_register()
-- delete of_get_child_by_name(dev->of_node, "aux-bus") and inline the
   function
-- not initialize rc = 0

Changes in v3:
-- add done_probing callback into devm_of_dp_aux_populate_bus()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_aux.c     | 34 ++++++++++++++++-----
 drivers/gpu/drm/msm/dp/dp_display.c | 59 +++++++++++++++----------------------
 2 files changed, 51 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index 10b6eeb..03f4951 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -479,7 +479,6 @@ void dp_aux_deinit(struct drm_dp_aux *dp_aux)
 
 int dp_aux_register(struct drm_dp_aux *dp_aux)
 {
-	struct dp_aux_private *aux;
 	int ret;
 
 	if (!dp_aux) {
@@ -487,12 +486,7 @@ int dp_aux_register(struct drm_dp_aux *dp_aux)
 		return -EINVAL;
 	}
 
-	aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
-
-	aux->dp_aux.name = "dpu_dp_aux";
-	aux->dp_aux.dev = aux->dev;
-	aux->dp_aux.transfer = dp_aux_transfer;
-	ret = drm_dp_aux_register(&aux->dp_aux);
+	ret = drm_dp_aux_register(dp_aux);
 	if (ret) {
 		DRM_ERROR("%s: failed to register drm aux: %d\n", __func__,
 				ret);
@@ -507,6 +501,21 @@ void dp_aux_unregister(struct drm_dp_aux *dp_aux)
 	drm_dp_aux_unregister(dp_aux);
 }
 
+static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux,
+				 unsigned long wait_us)
+{
+	int ret;
+	struct dp_aux_private *aux;
+
+	aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
+
+	pm_runtime_get_sync(aux->dev);
+	ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog);
+	pm_runtime_put_sync(aux->dev);
+
+	return ret;
+}
+
 struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog,
 			      bool is_edp)
 {
@@ -530,6 +539,17 @@ struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog,
 	aux->catalog = catalog;
 	aux->retry_cnt = 0;
 
+	/*
+	 * Use the drm_dp_aux_init() to use the aux adapter
+	 * before registering AUX with the DRM device so that
+	 * msm eDP panel can be detected by generic_dep_panel_probe().
+	 */
+	aux->dp_aux.name = "dpu_dp_aux";
+	aux->dp_aux.dev = dev;
+	aux->dp_aux.transfer = dp_aux_transfer;
+	aux->dp_aux.wait_hpd_asserted = dp_wait_hpd_asserted;
+	drm_dp_aux_init(&aux->dp_aux);
+
 	return &aux->dp_aux;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 057c4451..b4d2821 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1206,6 +1206,17 @@ static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pde
 	return NULL;
 }
 
+static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
+{
+	int rc;
+
+	rc = component_add(aux->dev, &dp_display_comp_ops);
+	if (rc)
+		DRM_ERROR("eDP component add failed, rc=%d\n", rc);
+
+	return rc;
+}
+
 static int dp_display_probe(struct platform_device *pdev)
 {
 	int rc = 0;
@@ -1271,10 +1282,18 @@ static int dp_display_probe(struct platform_device *pdev)
 	if (rc)
 		goto err;
 
-	rc = component_add(&pdev->dev, &dp_display_comp_ops);
-	if (rc) {
-		DRM_ERROR("component add failed, rc=%d\n", rc);
-		goto err;
+	if (dp->dp_display.is_edp) {
+		rc = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe);
+		if (rc) {
+			DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc);
+			goto err;
+		}
+	} else {
+		rc = component_add(&pdev->dev, &dp_display_comp_ops);
+		if (rc) {
+			DRM_ERROR("component add failed, rc=%d\n", rc);
+			goto err;
+		}
 	}
 
 	return rc;
@@ -1290,7 +1309,6 @@ static int dp_display_remove(struct platform_device *pdev)
 
 	component_del(&pdev->dev, &dp_display_comp_ops);
 	dp_display_deinit_sub_modules(dp);
-
 	platform_set_drvdata(pdev, NULL);
 
 	return 0;
@@ -1398,29 +1416,8 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
 {
 	int rc;
 	struct dp_display_private *dp_priv;
-	struct device_node *aux_bus;
-	struct device *dev;
 
 	dp_priv = container_of(dp, struct dp_display_private, dp_display);
-	dev = &dp_priv->pdev->dev;
-	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
-
-	if (aux_bus && dp->is_edp) {
-		/*
-		 * The code below assumes that the panel will finish probing
-		 * by the time devm_of_dp_aux_populate_ep_devices() returns.
-		 * This isn't a great assumption since it will fail if the
-		 * panel driver is probed asynchronously but is the best we
-		 * can do without a bigger driver reorganization.
-		 */
-		rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
-		of_node_put(aux_bus);
-		if (rc)
-			goto error;
-	} else if (dp->is_edp) {
-		DRM_ERROR("eDP aux_bus not found\n");
-		return -ENODEV;
-	}
 
 	/*
 	 * External bridges are mandatory for eDP interfaces: one has to
@@ -1433,17 +1430,9 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
 	if (!dp->is_edp && rc == -ENODEV)
 		return 0;
 
-	if (!rc) {
+	if (!rc)
 		dp->next_bridge = dp_priv->parser->next_bridge;
-		return 0;
-	}
 
-error:
-	if (dp->is_edp) {
-		of_dp_aux_depopulate_bus(dp_priv->aux);
-		dp_display_host_phy_exit(dp_priv);
-		dp_display_host_deinit(dp_priv);
-	}
 	return rc;
 }
 
-- 
2.7.4

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Stephen Boyd]

Quoting Kuogee Hsieh (2023-10-06 15:55:03)
> The purpose of this patch series is to incorporate pm runtime framework
> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
> driver during system probe time. During incorporating procedure, original
> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
> provided by pm runtiem framework such as pm_runtime_force_suspend() and
> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
> are bound at system probe time too.
>
> Kuogee Hsieh (7):
>   drm/msm/dp: tie dp_display_irq_handler() with dp driver
>   drm/msm/dp: rename is_connected with link_ready
>   drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes
>   drm/msm/dp: move parser->parse() and dp_power_client_init() to probe
>   drm/msm/dp: incorporate pm_runtime framework into DP driver
>   drm/msm/dp: delete EV_HPD_INIT_SETUP
>   drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()
>
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c |   4 -
>  drivers/gpu/drm/msm/dp/dp_aux.c         |  39 +++-
>  drivers/gpu/drm/msm/dp/dp_display.c     | 333 ++++++++++++--------------------

Tested-by: Stephen Boyd <swboyd@chromium.org> # Trogdor.Lazor

I ran some suspend cycles too with the lid open and closed.

Re: [Freedreno] [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Leonard Lausen]

Verified this fixes the "[drm:drm_mode_config_helper_resume] *ERROR* Failed to
resume (-107)" issue https://gitlab.freedesktop.org/drm/msm/-/issues/25

Tested-by: Leonard Lausen <leonard@lausen.nl> # on sc7180 lazor

On 10/6/23 18:55, Kuogee Hsieh wrote:
> The purpose of this patch series is to incorporate pm runtime framework
> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
> driver during system probe time. During incorporating procedure, original
> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
> provided by pm runtiem framework such as pm_runtime_force_suspend() and
> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
> are bound at system probe time too.
> 
> Kuogee Hsieh (7):
>   drm/msm/dp: tie dp_display_irq_handler() with dp driver
>   drm/msm/dp: rename is_connected with link_ready
>   drm/msm/dp: use drm_bridge_hpd_notify() to report HPD status changes
>   drm/msm/dp: move parser->parse() and dp_power_client_init() to probe
>   drm/msm/dp: incorporate pm_runtime framework into DP driver
>   drm/msm/dp: delete EV_HPD_INIT_SETUP
>   drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()
> 
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c |   4 -
>  drivers/gpu/drm/msm/dp/dp_aux.c         |  39 +++-
>  drivers/gpu/drm/msm/dp/dp_display.c     | 333 ++++++++++++--------------------
>  drivers/gpu/drm/msm/dp/dp_display.h     |   3 +-
>  drivers/gpu/drm/msm/dp/dp_drm.c         |  14 +-
>  drivers/gpu/drm/msm/dp/dp_power.c       |  16 --
>  drivers/gpu/drm/msm/dp/dp_power.h       |  11 --
>  drivers/gpu/drm/msm/msm_drv.h           |   5 -
>  8 files changed, 161 insertions(+), 264 deletions(-)
> 

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Dmitry Baryshkov]

On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
> The purpose of this patch series is to incorporate pm runtime framework
> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
> driver during system probe time. During incorporating procedure, original
> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
> provided by pm runtiem framework such as pm_runtime_force_suspend() and
> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
> are bound at system probe time too.


With this patchset in place I can crash the board using the following
sequence (SM8350-HDK):

- plug the USBC DP dongle
- run modetest at any mode, don't press Enter yet
- unplug the dongle
- press Enter to stop modetest

=> the board resets to Sahara.

Please ping me if you need any additional information from my side.

-- 
With best wishes
Dmitry

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Kuogee Hsieh]

On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>> The purpose of this patch series is to incorporate pm runtime framework
>> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
>> driver during system probe time. During incorporating procedure, original
>> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
>> provided by pm runtiem framework such as pm_runtime_force_suspend() and
>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
>> are bound at system probe time too.
>
> With this patchset in place I can crash the board using the following
> sequence (SM8350-HDK):
>
> - plug the USBC DP dongle
> - run modetest at any mode, don't press Enter yet
> - unplug the dongle
> - press Enter to stop modetest
>
> => the board resets to Sahara.
>
> Please ping me if you need any additional information from my side.

questiosn,

1) which dongle are you used?

2) what code branch shoud I used to duplicate this problem.

I can not duplicate  system crash problem at my setup kodiak (SM7325) 
chrome book with my PM runtime patch series.

my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)

I did:

1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC 
cable directly to 1080p display

2)  stop ui

3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at 
display)

4) unplug apple dongle or DP typeC cable

5) hit enter key

6) start ui

7) display back to login page of chrome book

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Dmitry Baryshkov]

On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
>
> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
> > On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
> >> The purpose of this patch series is to incorporate pm runtime framework
> >> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
> >> driver during system probe time. During incorporating procedure, original
> >> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
> >> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
> >> provided by pm runtiem framework such as pm_runtime_force_suspend() and
> >> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
> >> are bound at system probe time too.
> >
> > With this patchset in place I can crash the board using the following
> > sequence (SM8350-HDK):
> >
> > - plug the USBC DP dongle
> > - run modetest at any mode, don't press Enter yet
> > - unplug the dongle
> > - press Enter to stop modetest
> >
> > => the board resets to Sahara.
> >
> > Please ping me if you need any additional information from my side.
>
> questiosn,
>
> 1) which dongle are you used?

I have used several Dell and Hama USB-C dongles.

>
> 2) what code branch shoud I used to duplicate this problem.

I have pushed my kernel tree to
git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
I had several UCSI patches on top, but they should not be relevant.

>
> I can not duplicate  system crash problem at my setup kodiak (SM7325)
> chrome book with my PM runtime patch series.
>
> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
>
> I did:
>
> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
> cable directly to 1080p display
>
> 2)  stop ui
>
> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
> display)
>
> 4) unplug apple dongle or DP typeC cable
>
> 5) hit enter key
>
> 6) start ui
>
> 7) display back to login page of chrome book
>
>


-- 
With best wishes
Dmitry

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Kuogee Hsieh]

On 11/7/2023 1:23 PM, Dmitry Baryshkov wrote:
> On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>>
>> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
>>> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>>>> The purpose of this patch series is to incorporate pm runtime framework
>>>> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP panel
>>>> driver during system probe time. During incorporating procedure, original
>>>> customized pm realted fucntions, such as dp_pm_prepare(), dp_pm_suspend(),
>>>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with functions
>>>> provided by pm runtiem framework such as pm_runtime_force_suspend() and
>>>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq handler
>>>> are bound at system probe time too.
>>> With this patchset in place I can crash the board using the following
>>> sequence (SM8350-HDK):
>>>
>>> - plug the USBC DP dongle
>>> - run modetest at any mode, don't press Enter yet
>>> - unplug the dongle
>>> - press Enter to stop modetest
>>>
>>> => the board resets to Sahara.
>>>
>>> Please ping me if you need any additional information from my side.
>> questiosn,
>>
>> 1) which dongle are you used?
> I have used several Dell and Hama USB-C dongles.
>
>> 2) what code branch shoud I used to duplicate this problem.
> I have pushed my kernel tree to
> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
> I had several UCSI patches on top, but they should not be relevant.
git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm <== I 
synced out his branch and it is still work at my chromebook Kodiak DUT.
>
>> I can not duplicate  system crash problem at my setup kodiak (SM7325)
>> chrome book with my PM runtime patch series.
>>
>> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
>>
>> I did:
>>
>> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
>> cable directly to 1080p display
>>
>> 2)  stop ui
>>
>> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
>> display)
>>
>> 4) unplug apple dongle or DP typeC cable
>>
>> 5) hit enter key
>>
>> 6) start ui
>>
>> 7) display back to login page of chrome book
>>
>>
>

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Abhinav Kumar]

On 11/8/2023 10:10 AM, Kuogee Hsieh wrote:
> 
> On 11/7/2023 1:23 PM, Dmitry Baryshkov wrote:
>> On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@quicinc.com> 
>> wrote:
>>>
>>> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
>>>> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh <quic_khsieh@quicinc.com> 
>>>> wrote:
>>>>> The purpose of this patch series is to incorporate pm runtime 
>>>>> framework
>>>>> into MSM eDP/DP driver so that eDP panel can be detected by DRM eDP 
>>>>> panel
>>>>> driver during system probe time. During incorporating procedure, 
>>>>> original
>>>>> customized pm realted fucntions, such as dp_pm_prepare(), 
>>>>> dp_pm_suspend(),
>>>>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with 
>>>>> functions
>>>>> provided by pm runtiem framework such as pm_runtime_force_suspend() 
>>>>> and
>>>>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq 
>>>>> handler
>>>>> are bound at system probe time too.
>>>> With this patchset in place I can crash the board using the following
>>>> sequence (SM8350-HDK):
>>>>
>>>> - plug the USBC DP dongle
>>>> - run modetest at any mode, don't press Enter yet
>>>> - unplug the dongle
>>>> - press Enter to stop modetest
>>>>
>>>> => the board resets to Sahara.
>>>>
>>>> Please ping me if you need any additional information from my side.
>>> questiosn,
>>>
>>> 1) which dongle are you used?
>> I have used several Dell and Hama USB-C dongles.
>>
>>> 2) what code branch shoud I used to duplicate this problem.
>> I have pushed my kernel tree to
>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
>> I had several UCSI patches on top, but they should not be relevant.
> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm <== I 
> synced out his branch and it is still work at my chromebook Kodiak DUT.
>>

Perhaps the gap in test results with the same tree is due to internal 
hpd vs hpd pin. We need to try this on a device which does not use 
internal hpd.

>>> I can not duplicate  system crash problem at my setup kodiak (SM7325)
>>> chrome book with my PM runtime patch series.
>>>
>>> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
>>>
>>> I did:
>>>
>>> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
>>> cable directly to 1080p display
>>>
>>> 2)  stop ui
>>>
>>> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
>>> display)
>>>
>>> 4) unplug apple dongle or DP typeC cable
>>>
>>> 5) hit enter key
>>>
>>> 6) start ui
>>>
>>> 7) display back to login page of chrome book
>>>
>>>
>>

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Kuogee Hsieh]

On 11/8/2023 10:27 AM, Abhinav Kumar wrote:
>
>
> On 11/8/2023 10:10 AM, Kuogee Hsieh wrote:
>>
>> On 11/7/2023 1:23 PM, Dmitry Baryshkov wrote:
>>> On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@quicinc.com> 
>>> wrote:
>>>>
>>>> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
>>>>> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh 
>>>>> <quic_khsieh@quicinc.com> wrote:
>>>>>> The purpose of this patch series is to incorporate pm runtime 
>>>>>> framework
>>>>>> into MSM eDP/DP driver so that eDP panel can be detected by DRM 
>>>>>> eDP panel
>>>>>> driver during system probe time. During incorporating procedure, 
>>>>>> original
>>>>>> customized pm realted fucntions, such as dp_pm_prepare(), 
>>>>>> dp_pm_suspend(),
>>>>>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with 
>>>>>> functions
>>>>>> provided by pm runtiem framework such as 
>>>>>> pm_runtime_force_suspend() and
>>>>>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq 
>>>>>> handler
>>>>>> are bound at system probe time too.
>>>>> With this patchset in place I can crash the board using the following
>>>>> sequence (SM8350-HDK):
>>>>>
>>>>> - plug the USBC DP dongle
>>>>> - run modetest at any mode, don't press Enter yet
>>>>> - unplug the dongle
>>>>> - press Enter to stop modetest
>>>>>
>>>>> => the board resets to Sahara.
>>>>>
>>>>> Please ping me if you need any additional information from my side.
>>>> questiosn,
>>>>
>>>> 1) which dongle are you used?
>>> I have used several Dell and Hama USB-C dongles.
>>>
>>>> 2) what code branch shoud I used to duplicate this problem.
>>> I have pushed my kernel tree to
>>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
>>> I had several UCSI patches on top, but they should not be relevant.
>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm <== 
>> I synced out his branch and it is still work at my chromebook Kodiak 
>> DUT.
>>>
>
> Perhaps the gap in test results with the same tree is due to internal 
> hpd vs hpd pin. We need to try this on a device which does not use 
> internal hpd.


Hi Dmitry,

I have two more questions,

1) are you see test pattern shows at external DP when you run modetest?
2) is *.kcrash file created under /var/spool/crash/ when system crashed. 
If it is, can you share it?

Thanks,

>
>>>> I can not duplicate  system crash problem at my setup kodiak (SM7325)
>>>> chrome book with my PM runtime patch series.
>>>>
>>>> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
>>>>
>>>> I did:
>>>>
>>>> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
>>>> cable directly to 1080p display
>>>>
>>>> 2)  stop ui
>>>>
>>>> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
>>>> display)
>>>>
>>>> 4) unplug apple dongle or DP typeC cable
>>>>
>>>> 5) hit enter key
>>>>
>>>> 6) start ui
>>>>
>>>> 7) display back to login page of chrome book
>>>>
>>>>
>>>

Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

[Dmitry Baryshkov]

Hello Kuogee,


On Thu, 9 Nov 2023 at 19:51, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
>
> On 11/8/2023 10:27 AM, Abhinav Kumar wrote:
> >
> >
> > On 11/8/2023 10:10 AM, Kuogee Hsieh wrote:
> >>
> >> On 11/7/2023 1:23 PM, Dmitry Baryshkov wrote:
> >>> On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@quicinc.com>
> >>> wrote:
> >>>>
> >>>> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
> >>>>> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh
> >>>>> <quic_khsieh@quicinc.com> wrote:
> >>>>>> The purpose of this patch series is to incorporate pm runtime
> >>>>>> framework
> >>>>>> into MSM eDP/DP driver so that eDP panel can be detected by DRM
> >>>>>> eDP panel
> >>>>>> driver during system probe time. During incorporating procedure,
> >>>>>> original
> >>>>>> customized pm realted fucntions, such as dp_pm_prepare(),
> >>>>>> dp_pm_suspend(),
> >>>>>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with
> >>>>>> functions
> >>>>>> provided by pm runtiem framework such as
> >>>>>> pm_runtime_force_suspend() and
> >>>>>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq
> >>>>>> handler
> >>>>>> are bound at system probe time too.
> >>>>> With this patchset in place I can crash the board using the following
> >>>>> sequence (SM8350-HDK):
> >>>>>
> >>>>> - plug the USBC DP dongle
> >>>>> - run modetest at any mode, don't press Enter yet
> >>>>> - unplug the dongle
> >>>>> - press Enter to stop modetest
> >>>>>
> >>>>> => the board resets to Sahara.
> >>>>>
> >>>>> Please ping me if you need any additional information from my side.
> >>>> questiosn,
> >>>>
> >>>> 1) which dongle are you used?
> >>> I have used several Dell and Hama USB-C dongles.
> >>>
> >>>> 2) what code branch shoud I used to duplicate this problem.
> >>> I have pushed my kernel tree to
> >>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
> >>> I had several UCSI patches on top, but they should not be relevant.
> >> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm <==
> >> I synced out his branch and it is still work at my chromebook Kodiak
> >> DUT.
> >>>
> >
> > Perhaps the gap in test results with the same tree is due to internal
> > hpd vs hpd pin. We need to try this on a device which does not use
> > internal hpd.
>
>
> Hi Dmitry,

First of all, I was able to reproduce the issue without this patch
series. Kuogee, I must ask your pardon, it is not a regression and it
is not caused by this series.
So, we have a bug, but not a regression.

Second, a stable reproducer:

When you unplug and re-plug the dongle, switch the orientation of the dongle.
This way the system crashes in 100% of cases.

Here are the last messages that I see on my console:

trying to open device 'tilcdc'...failed
trying to open device 'msm'...done
setting mode 3840x2160-30.00Hz on connectors 34, crtc 84
failed to set gamma: Function not implemented
[   25.504828] [drm:dpu_encoder_phys_vid_wait_for_commit_done:487]
[dpu error]vblank timeout
[   25.515024] [drm:dpu_kms_wait_for_commit_done:494] [dpu error]wait
for commit done returned -110
[   25.621146] [drm:dpu_encoder_frame_done_timeout:2342] [dpu
error]enc33 frame done timeout
Format: Log Type - Time(microsec) - Message - Optional Info
Log Type: B - Since Boot(Power On Reset),  D - Delta,  S - Statistic
S - QC_IMAGE_VERSION_STRING=BOOT.MXF.1.0-00848-LAHAINA-1


>
> I have two more questions,
>
> 1) are you see test pattern shows at external DP when you run modetest?

Yes, I see the pattern

> 2) is *.kcrash file created under /var/spool/crash/ when system crashed.
> If it is, can you share it?

There is no kcrash, as there is no kernel crash. The system reboots to
the download mode.

>
> Thanks,
>
> >
> >>>> I can not duplicate  system crash problem at my setup kodiak (SM7325)
> >>>> chrome book with my PM runtime patch series.
> >>>>
> >>>> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
> >>>>
> >>>> I did:
> >>>>
> >>>> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
> >>>> cable directly to 1080p display
> >>>>
> >>>> 2)  stop ui
> >>>>
> >>>> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
> >>>> display)
> >>>>
> >>>> 4) unplug apple dongle or DP typeC cable
> >>>>
> >>>> 5) hit enter key
> >>>>
> >>>> 6) start ui
> >>>>
> >>>> 7) display back to login page of chrome book
> >>>>
> >>>>
> >>>



-- 
With best wishes
Dmitry