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    Subject[PATCH 4.14 009/165] drm/bridge: adv7511: Reset registers on hotplug
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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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