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drm/bridge: adv7511: Reset registers on hotplug

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[ Upstream commit 5f3417569165a8ee57654217f73e0160312f409c ]

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>
Tested-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180703165648.120401-1-seanpaul@chromium.org
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Paul 2018-07-03 12:56:03 -04:00 • committed by Greg Kroah-Hartman
parent 8d437bd6db
commit f9ddeba81c
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i2c/adv7511.c
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@ -450,6 +450,18 @@ static void adv7511_hpd_work(struct work_struct *work)
else else
status = connector_status_disconnected; 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) { if (adv7511->connector.status != status) {
adv7511->connector.status = status; adv7511->connector.status = status;
drm_kms_helper_hotplug_event(adv7511->connector.dev); drm_kms_helper_hotplug_event(adv7511->connector.dev);