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

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Message-Id: <20250825-msm-dp-mst-v3-25-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:11 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yongxing Mou <yongxing.mou@....qualcomm.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: [PATCH v3 25/38] drm/msm/dp: Mark the SST bridge disconnected when
 mst is active

From: Abhinav Kumar <quic_abhinavk@...cinc.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@...cinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@....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