| Message ID | 1660077890-31622-1-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/msm/dp: check hpd_state before push idle pattern at dp_bridge_disable() | expand |
On 8/9/2022 1:44 PM, Kuogee Hsieh wrote: > dp_bridge_disable() is the first step toward tearing down main link. > Its major function is to start transmitting idle pattern to replace > video stream. This patch will check hpd_state to make sure main link > is enabled before commit changes of main link's configuration to > push idle pattern out to avoid system crashing due to main link clock > is disabled while access main link registers. > > Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions"); there should be no ; at the end > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > > Reported-by: Leonard Lausen @leezu We should check the email address of the reporter , this is not right. > --- > drivers/gpu/drm/msm/dp/dp_display.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c > index b36f8b6..678289a 100644 > --- a/drivers/gpu/drm/msm/dp/dp_display.c > +++ b/drivers/gpu/drm/msm/dp/dp_display.c > @@ -1729,10 +1729,20 @@ void dp_bridge_disable(struct drm_bridge *drm_bridge) > struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge); > struct msm_dp *dp = dp_bridge->dp_display; > struct dp_display_private *dp_display; > + u32 state; > > dp_display = container_of(dp, struct dp_display_private, dp_display); > > + 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; > + } > + > dp_ctrl_push_idle(dp_display->ctrl); > + mutex_unlock(&dp_display->event_mutex); > } > > void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
Quoting Kuogee Hsieh (2022-08-09 13:44:50) > dp_bridge_disable() is the first step toward tearing down main link. > Its major function is to start transmitting idle pattern to replace > video stream. This patch will check hpd_state to make sure main link > is enabled before commit changes of main link's configuration to > push idle pattern out to avoid system crashing due to main link clock > is disabled while access main link registers. > > Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions"); Does it really fix 375a126090b9 ("drm/msm/dp: tear down main link at unplug handle immediately")? I don't see how removing extra wrappers caused us to start trying to set the idle pattern when the device was unclocked.
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index b36f8b6..678289a 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1729,10 +1729,20 @@ void dp_bridge_disable(struct drm_bridge *drm_bridge) struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge); struct msm_dp *dp = dp_bridge->dp_display; struct dp_display_private *dp_display; + u32 state; dp_display = container_of(dp, struct dp_display_private, dp_display); + 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; + } + dp_ctrl_push_idle(dp_display->ctrl); + mutex_unlock(&dp_display->event_mutex); } void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
dp_bridge_disable() is the first step toward tearing down main link. Its major function is to start transmitting idle pattern to replace video stream. This patch will check hpd_state to make sure main link is enabled before commit changes of main link's configuration to push idle pattern out to avoid system crashing due to main link clock is disabled while access main link registers. Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions"); Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reported-by: Leonard Lausen @leezu --- drivers/gpu/drm/msm/dp/dp_display.c | 10 ++++++++++ 1 file changed, 10 insertions(+)