[v3] drm/msm/dp: Add MST support for MSM chipsets

[PATCH v3 25/38] drm/msm/dp: Mark the SST bridge disconnected when mst is active

Posted by Yongxing Mou 1 month, 1 week ago

From: Abhinav Kumar <quic_abhinavk@quicinc.com>

The bridge detect function is only applicable for SST. In MST mode,
connector detection is handled by MST bridges. This patch skips
detection for the SST bridge when MST is active.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index e2e6b0ea2f9dbfe49a599ca19b1d205669365c4c..cb433103d439ac6b8089bdecf0ee6be35c914db1 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -986,7 +986,7 @@ enum drm_connector_status msm_dp_bridge_detect(struct drm_bridge *bridge, struct
 
 	priv = container_of(dp, struct msm_dp_display_private, msm_dp_display);
 
-	if (!dp->link_ready)
+	if (!dp->link_ready || dp->mst_active)
 		return status;
 
 	msm_dp_aux_enable_xfers(priv->aux, true);

-- 
2.34.1

Re: [PATCH v3 25/38] drm/msm/dp: Mark the SST bridge disconnected when mst is active

Posted by Dmitry Baryshkov 1 month, 1 week ago

On Mon, Aug 25, 2025 at 10:16:11PM +0800, Yongxing Mou wrote:
> From: Abhinav Kumar <quic_abhinavk@quicinc.com>
> 
> The bridge detect function is only applicable for SST. In MST mode,
> connector detection is handled by MST bridges. This patch skips
> detection for the SST bridge when MST is active.
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry