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    Subject[PATCH 5.17 0569/1126] drm/msm/dp: always add fail-safe mode into connector mode list
    Date
    From: Kuogee Hsieh <quic_khsieh@quicinc.com>

    [ Upstream commit d4aca422539c441a7f3fec749287b36de37d9b6b ]

    Some of DP link compliant test expects to return fail-safe mode
    if prefer detailed timing mode can not be supported by mainlink's
    lane and rate after link training. Therefore add fail-safe mode
    into connector mode list as backup mode. This patch fixes test
    case 4.2.2.1.

    Changes in v2:
    -- add Fixes text string

    Fixes: 4b85d405cfe9 ( "drm/msm/dp: reduce link rate if failed at link training 1")
    Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
    Reviewed-by: Stephen Boyd <swboyd@chromium.org>
    Link: https://lore.kernel.org/r/1643066274-25814-1-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_panel.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
    index 71db10c0f262..f1418722c549 100644
    --- a/drivers/gpu/drm/msm/dp/dp_panel.c
    +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
    @@ -212,6 +212,11 @@ int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
    if (drm_add_modes_noedid(connector, 640, 480))
    drm_set_preferred_mode(connector, 640, 480);
    mutex_unlock(&connector->dev->mode_config.mutex);
    + } else {
    + /* always add fail-safe mode as backup mode */
    + mutex_lock(&connector->dev->mode_config.mutex);
    + drm_add_modes_noedid(connector, 640, 480);
    + mutex_unlock(&connector->dev->mode_config.mutex);
    }

    if (panel->aux_cfg_update_done) {
    --
    2.34.1


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