The bridge loses its hw state when the cable is unplugged. If we detect this case in the hpd handler, reset its state.
Reported-by: Rob Clark robdclark@gmail.com Signed-off-by: Sean Paul seanpaul@chromium.org --- This is the follow-up to "drm/msm: Disable mdp5 crtc when there are no active planes". I incorrectly assumed the modeset was required from the msm side, but Rob pointed out that he thought it might be a bridge issue.
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index 73021b388e12..dd3ff2f2cdce 100644 --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -429,6 +429,18 @@ static void adv7511_hpd_work(struct work_struct *work) else status = connector_status_disconnected;
+ /* + * The bridge resets its registers on unplug. So when we get a plug + * event and we're already supposed to be powered, cycle the bridge to + * restore its state. + */ + if (status == connector_status_connected && + adv7511->connector.status == connector_status_disconnected && + adv7511->powered) { + regcache_mark_dirty(adv7511->regmap); + adv7511_power_on(adv7511); + } + if (adv7511->connector.status != status) { adv7511->connector.status = status; if (status == connector_status_disconnected)