| Message ID | 1619048258-8717-2-git-send-email-khsieh@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | check sink_count before update is_connected status | expand |
Quoting Kuogee Hsieh (2021-04-21 16:37:35) > Link status is different from display connected status in the case > of something like an Apple dongle where the type-c plug can be > connected, and therefore the link is connected, but no sink is > connected until an HDMI cable is plugged into the dongle. > The sink_count of DPCD of dongle will increase to 1 once an HDMI > cable is plugged into the dongle so that display connected status > will become true. This checking also apply at pm_resume. > > Changes in v4: > -- none > > Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up and pm_resume") > Reported-by: Stephen Boyd <swboyd@chromium.org> > Reviewed-by: Stephen Boyd <swboyd@chromium.org> > Tested-by: Stephen Boyd <swboyd@chromium.org> > Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> > --- > drivers/gpu/drm/msm/dp/dp_display.c | 15 ++++++++------- > 1 file changed, 8 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c > index 5a39da6..0ba71c7 100644 > --- a/drivers/gpu/drm/msm/dp/dp_display.c > +++ b/drivers/gpu/drm/msm/dp/dp_display.c > @@ -586,10 +586,8 @@ static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data) > mutex_lock(&dp->event_mutex); > > state = dp->hpd_state; > - if (state == ST_CONNECT_PENDING) { > - dp_display_enable(dp, 0); > + if (state == ST_CONNECT_PENDING) > dp->hpd_state = ST_CONNECTED; > - } This part has been there since commit 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets") so we should add that tag here too, like Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets") It would also be nice if this hunk was explained. It doesn't make sense to me that a timeout would enable the display so maybe that can be called out in the commit text about why we remove the call here.
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 5a39da6..0ba71c7 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -586,10 +586,8 @@ static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data) mutex_lock(&dp->event_mutex); state = dp->hpd_state; - if (state == ST_CONNECT_PENDING) { - dp_display_enable(dp, 0); + if (state == ST_CONNECT_PENDING) dp->hpd_state = ST_CONNECTED; - } mutex_unlock(&dp->event_mutex); @@ -669,10 +667,8 @@ static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data mutex_lock(&dp->event_mutex); state = dp->hpd_state; - if (state == ST_DISCONNECT_PENDING) { - dp_display_disable(dp, 0); + if (state == ST_DISCONNECT_PENDING) dp->hpd_state = ST_DISCONNECTED; - } mutex_unlock(&dp->event_mutex); @@ -1272,7 +1268,12 @@ static int dp_pm_resume(struct device *dev) status = dp_catalog_link_is_connected(dp->catalog); - if (status) + /* + * can not declared display is connected unless + * HDMI cable is plugged in and sink_count of + * dongle become 1 + */ + if (status && dp->link->sink_count) dp->dp_display.is_connected = true; else dp->dp_display.is_connected = false;
Link status is different from display connected status in the case of something like an Apple dongle where the type-c plug can be connected, and therefore the link is connected, but no sink is connected until an HDMI cable is plugged into the dongle. The sink_count of DPCD of dongle will increase to 1 once an HDMI cable is plugged into the dongle so that display connected status will become true. This checking also apply at pm_resume. Changes in v4: -- none Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up and pm_resume") Reported-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Tested-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> --- drivers/gpu/drm/msm/dp/dp_display.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)