This is a note to let you know that I've just added the patch titled
drm/msm/dp: fixes wrong connection state caused by failure of link train
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-dp-fixes-wrong-connection-state-caused-by-fa.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b5babd50c4fd236abc1c9e0bb39e889d5e1867e2
Author: Kuogee Hsieh <khsieh@xxxxxxxxxxxxxx>
Date: Tue Nov 3 14:53:36 2020 -0800
drm/msm/dp: fixes wrong connection state caused by failure of link train
[ Upstream commit 62671d2ef24bca1e2e1709a59a5bfb5c423cdc8e ]
Connection state is not set correctly happen when either failure of link
train due to cable unplugged in the middle of aux channel reading or
cable plugged in while in suspended state. This patch fixes these problems.
This patch also replace ST_SUSPEND_PENDING with ST_DISPLAY_OFF.
Changes in V2:
-- Add more information to commit message.
Changes in V3:
-- change base
Changes in V4:
-- add Fixes tag
Signed-off-by: Kuogee Hsieh <khsieh@xxxxxxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 47bdddb860e5..4b18ab71ae59 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -45,7 +45,7 @@ enum {
ST_CONNECT_PENDING,
ST_CONNECTED,
ST_DISCONNECT_PENDING,
- ST_SUSPEND_PENDING,
+ ST_DISPLAY_OFF,
ST_SUSPENDED,
};
@@ -531,7 +531,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
state = dp->hpd_state;
- if (state == ST_SUSPEND_PENDING) {
+ if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
mutex_unlock(&dp->event_mutex);
return 0;
}
@@ -553,14 +553,14 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
hpd->hpd_high = 1;
ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
- if (ret) { /* failed */
+ if (ret) { /* link train failed */
hpd->hpd_high = 0;
dp->hpd_state = ST_DISCONNECTED;
+ } else {
+ /* start sentinel checking in case of missing uevent */
+ dp_add_event(dp, EV_CONNECT_PENDING_TIMEOUT, 0, tout);
}
- /* start sanity checking */
- dp_add_event(dp, EV_CONNECT_PENDING_TIMEOUT, 0, tout);
-
mutex_unlock(&dp->event_mutex);
/* uevent will complete connection part */
@@ -612,11 +612,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
state = dp->hpd_state;
- if (state == ST_SUSPEND_PENDING) {
- mutex_unlock(&dp->event_mutex);
- return 0;
- }
-
if (state == ST_DISCONNECT_PENDING || state == ST_DISCONNECTED) {
mutex_unlock(&dp->event_mutex);
return 0;
@@ -643,7 +638,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
*/
dp_display_usbpd_disconnect_cb(&dp->pdev->dev);
- /* start sanity checking */
+ /* start sentinel checking in case of missing uevent */
dp_add_event(dp, EV_DISCONNECT_PENDING_TIMEOUT, 0, DP_TIMEOUT_5_SECOND);
/* signal the disconnect event early to ensure proper teardown */
@@ -682,7 +677,7 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
/* irq_hpd can happen at either connected or disconnected state */
state = dp->hpd_state;
- if (state == ST_SUSPEND_PENDING) {
+ if (state == ST_DISPLAY_OFF) {
mutex_unlock(&dp->event_mutex);
return 0;
}
@@ -1119,7 +1114,7 @@ static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
}
if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
- /* delete connect pending event first */
+ /* stop sentinel connect pending checking */
dp_del_event(dp, EV_CONNECT_PENDING_TIMEOUT);
dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
}
@@ -1252,13 +1247,10 @@ static int dp_pm_resume(struct device *dev)
status = dp_catalog_hpd_get_state_status(dp->catalog);
- if (status) {
+ if (status)
dp->dp_display.is_connected = true;
- } else {
+ else
dp->dp_display.is_connected = false;
- /* make sure next resume host_init be called */
- dp->core_initialized = false;
- }
mutex_unlock(&dp->event_mutex);
@@ -1280,6 +1272,9 @@ static int dp_pm_suspend(struct device *dev)
dp->hpd_state = ST_SUSPENDED;
+ /* host_init will be called at pm_resume */
+ dp->core_initialized = false;
+
mutex_unlock(&dp->event_mutex);
return 0;
@@ -1412,6 +1407,7 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
mutex_lock(&dp_display->event_mutex);
+ /* stop sentinel checking */
dp_del_event(dp_display, EV_CONNECT_PENDING_TIMEOUT);
rc = dp_display_set_mode(dp, &dp_display->dp_mode);
@@ -1430,7 +1426,7 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
state = dp_display->hpd_state;
- if (state == ST_SUSPEND_PENDING)
+ if (state == ST_DISPLAY_OFF)
dp_display_host_init(dp_display);
dp_display_enable(dp_display, 0);
@@ -1442,7 +1438,8 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
dp_display_unprepare(dp);
}
- if (state == ST_SUSPEND_PENDING)
+ /* manual kick off plug event to train link */
+ if (state == ST_DISPLAY_OFF)
dp_add_event(dp_display, EV_IRQ_HPD_INT, 0, 0);
/* completed connection */
@@ -1474,6 +1471,7 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
mutex_lock(&dp_display->event_mutex);
+ /* stop sentinel checking */
dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT);
dp_display_disable(dp_display, 0);
@@ -1487,7 +1485,7 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
/* completed disconnection */
dp_display->hpd_state = ST_DISCONNECTED;
} else {
- dp_display->hpd_state = ST_SUSPEND_PENDING;
+ dp_display->hpd_state = ST_DISPLAY_OFF;
}
mutex_unlock(&dp_display->event_mutex);
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 2768d1d306f0..550871ba6e5a 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -196,6 +196,11 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
&panel->aux->ddc);
if (!dp_panel->edid) {
DRM_ERROR("panel edid read failed\n");
+ /* check edid read fail is due to unplug */
+ if (!dp_catalog_hpd_get_state_status(panel->catalog)) {
+ rc = -ETIMEDOUT;
+ goto end;
+ }
/* fail safe edid */
mutex_lock(&connector->dev->mode_config.mutex);
