Patch "drm/amd/display: Skip Invalid Streams from DSC Policy" has been added to the 6.12-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amd/display: Skip Invalid Streams from DSC Policy

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-skip-invalid-streams-from-dsc-policy.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d3c4a1c715212350a55bc54cb53f999632261bd2
Author: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
Date:   Mon Sep 23 16:20:40 2024 -0400

    drm/amd/display: Skip Invalid Streams from DSC Policy
    
    [ Upstream commit 9afeda04964281e9f708b92c2a9c4f8a1387b46e ]
    
    Streams with invalid new connector state should be elimiated from
    dsc policy.
    
    Reviewed-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
    Signed-off-by: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
    Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index a08e8a0b696c6..f756640048fee 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -1120,6 +1120,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
 	int i, k, ret;
 	bool debugfs_overwrite = false;
 	uint16_t fec_overhead_multiplier_x1000 = get_fec_overhead_multiplier(dc_link);
+	struct drm_connector_state *new_conn_state;
 
 	memset(params, 0, sizeof(params));
 
@@ -1127,7 +1128,7 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
 		return PTR_ERR(mst_state);
 
 	/* Set up params */
-	DRM_DEBUG_DRIVER("%s: MST_DSC Set up params for %d streams\n", __func__, dc_state->stream_count);
+	DRM_DEBUG_DRIVER("%s: MST_DSC Try to set up params from %d streams\n", __func__, dc_state->stream_count);
 	for (i = 0; i < dc_state->stream_count; i++) {
 		struct dc_dsc_policy dsc_policy = {0};
 
@@ -1143,6 +1144,14 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
 		if (!aconnector->mst_output_port)
 			continue;
 
+		new_conn_state = drm_atomic_get_new_connector_state(state, &aconnector->base);
+
+		if (!new_conn_state) {
+			DRM_DEBUG_DRIVER("%s:%d MST_DSC Skip the stream 0x%p with invalid new_conn_state\n",
+					__func__, __LINE__, stream);
+			continue;
+		}
+
 		stream->timing.flags.DSC = 0;
 
 		params[count].timing = &stream->timing;
@@ -1175,6 +1184,8 @@ static int compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
 		count++;
 	}
 
+	DRM_DEBUG_DRIVER("%s: MST_DSC Params set up for %d streams\n", __func__, count);
+
 	if (count == 0) {
 		ASSERT(0);
 		return 0;