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@oss.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

On Mon, Aug 25, 2025 at 10:16:15PM +0800, Yongxing Mou wrote:
> 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@oss.qualcomm.com>
> ---
>  drivers/gpu/drm/msm/msm_atomic.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 

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


-- 
With best wishes
Dmitry