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@quic... 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) {