| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 009/165] drm/bridge: adv7511: Reset registers on hotplug | Date | Mon, 3 Sep 2018 18:54:55 +0200 |
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4.14-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-seanpaul@chromium.org Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -424,6 +424,18 @@ 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);
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