[PATCH v6 29/29] drm/msm/dp: mark the SST connector disconnected when MST is enabled

[Yongxing Mou]

When MST becomes active, the initial HPD plug notification updates the
SST connector state to connected.

However, the subsequent SST connector detect path reports disconnected
while MST is enabled. This connected -> disconnected transition is then
observed by the polling logic and may result in an unnecessary hotplug
event.

Set the SST connector state to disconnected immediately after MST is
initialized so that the detect path does not introduce a transient
state change.

Signed-off-by: Yongxing Mou <yongxing.mou@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index d2b2c7141db0..d207ec3ca8bf 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -290,6 +290,10 @@ static void msm_dp_display_mst_enable(struct msm_dp_display_private *dp)
 	}
 
 	msm_dp->mst_active = true;
+
+	scoped_guard(mutex, &msm_dp->connector->dev->mode_config.mutex)
+		msm_dp->connector->status = connector_status_disconnected;
+
 	msm_dp_mst_display_set_mgr_state(msm_dp, true);
 }
 

-- 
2.43.0