linux-kernel - [PATCH v3 29/38] drm/msm/dp: add MST atomic check to msm_atomic

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Message-Id: <20250825-msm-dp-mst-v3-29-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:15 +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>
Subject: [PATCH v3 29/38] drm/msm/dp: add MST atomic check to
 msm_atomic_check()

Add a call to drm_dp_mst_atomic_check() within msm_atomic_check() to ensure
proper validation of atomic state changes related to DisplayPort
Multi-Stream Transport (MST).

This complements the existing drm_atomic_helper_check() and allows the MST
framework to perform its own consistency checks during atomic updates,
such as validating connector states and topology changes.

Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/msm_atomic.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 87a91148a731dc911f30695add4c8f5002770220..3aa0020dec3a90b693ad3d4171cfcffc091aad4c 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -6,6 +6,7 @@
 
 #include <drm/drm_atomic_uapi.h>
 #include <drm/drm_vblank.h>
+#include <drm/display/drm_dp_mst_helper.h>
 
 #include "msm_atomic_trace.h"
 #include "msm_drv.h"
@@ -207,7 +208,11 @@ int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
 	if (ret)
 		return ret;
 
-	return drm_atomic_helper_check(dev, state);
+	ret = drm_atomic_helper_check(dev, state);
+	if (ret)
+		return ret;
+
+	return drm_dp_mst_atomic_check(state);
 }
 
 void msm_atomic_commit_tail(struct drm_atomic_state *state)

-- 
2.34.1