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@xxxxxxxxxxx>
---
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 71db10c..f141872 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) {
--
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