4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sean Paul seanpaul@chromium.org
[ 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-seanpa... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i2c/adv7511.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/drivers/gpu/drm/i2c/adv7511.c +++ b/drivers/gpu/drm/i2c/adv7511.c @@ -450,6 +450,18 @@ static void adv7511_hpd_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; drm_kms_helper_hotplug_event(adv7511->connector.dev);