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    Subject[PATCH 6.0 351/862] drm/bridge: it6505: Power on downstream device in .atomic_enable
    Date
    From: Pin-Yen Lin <treapking@chromium.org>

    [ Upstream commit fbc1fdaa8338ec4ebd862d918a0ce3e12033e8a3 ]

    Send DPCD DP_SET_POWER_D0 command to the monitor in .atomic_enable
    callback. Without this command, some monitors won't show up again after
    changing the resolution.

    Fixes: 46ca7da7f1e8 ("drm/bridge: it6505: Send DPCD SET_POWER to downstream")

    Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
    Reviewed-by: Allen Chen <allen.chen@ite.com.tw>
    Fixes: 46ca7da7f1e8 ("drm/bridge: it6505: Send DPCD SET_POWER to downstream")
    Signed-off-by: Robert Foss <robert.foss@linaro.org>
    Link: https://patchwork.freedesktop.org/patch/msgid/20220714173715.v2.1.I85af54e9ceda74ec69f661852825845f983fc343@changeid
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/bridge/ite-it6505.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
    index 4b673c4792d7..e5626035f311 100644
    --- a/drivers/gpu/drm/bridge/ite-it6505.c
    +++ b/drivers/gpu/drm/bridge/ite-it6505.c
    @@ -2945,6 +2945,9 @@ static void it6505_bridge_atomic_enable(struct drm_bridge *bridge,
    if (ret)
    dev_err(dev, "Failed to setup AVI infoframe: %d", ret);

    + it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
    + DP_SET_POWER_D0);
    +
    it6505_update_video_parameter(it6505, mode);

    ret = it6505_send_video_infoframe(it6505, &frame);
    --
    2.35.1


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