Quoting Kuogee Hsieh (2021-04-13 16:11:10)
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.
Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up and pm_resume") Reported-by: Stephen Boyd swboyd@chromium.org Signed-off-by: Kuogee Hsieh khsieh@codeaurora.org
Reviewed-by: Stephen Boyd swboyd@chromium.org Tested-by: Stephen Boyd swboyd@chromium.org