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    Subject[PATCH 5.15 268/667] drm/msm/dp: reset DP controller before transmit phy test pattern
    Date
    From: Kuogee Hsieh <quic_khsieh@quicinc.com>

    [ Upstream commit 581d69981159b00f0443d171a4b900089f34ccfe ]

    DP controller state can not switch from video ready state to
    transmit phy pattern state at run time. DP mainlink has to be
    teared down followed by reset controller to default state to have
    DP controller switch to transmit phy test pattern state and start
    generate specified phy test pattern to sinker once main link setup
    again.

    Changes in v2:
    -- correct Fixes's commit id

    Fixes: 52352fe2f866 ("drm/msm/dp: use dp_ctrl_off_link_stream during PHY compliance test run")
    Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
    Reviewed-by: Stephen Boyd <swboyd@chromium.org>
    Patchwork: https://patchwork.freedesktop.org/patch/483563/
    Link: https://lore.kernel.org/r/1650995939-28467-2-git-send-email-quic_khsieh@quicinc.com
    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
    index 4af281d97493..1ccb166e3b28 100644
    --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
    +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
    @@ -1515,7 +1515,7 @@ static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
    * running. Add the global reset just before disabling the
    * link clocks and core clocks.
    */
    - ret = dp_ctrl_off_link_stream(&ctrl->dp_ctrl);
    + ret = dp_ctrl_off(&ctrl->dp_ctrl);
    if (ret) {
    DRM_ERROR("failed to disable DP controller\n");
    return ret;
    --
    2.35.1


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