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From 2fd9916a465e3b62452ac4346def013c3d8698a4 Mon Sep 17 00:00:00 2001
From: Fangzhi Zuo <jerry.zuo@amd.com>
Date: Wed, 17 May 2023 19:37:13 +0800
Subject: [PATCH 2/3] drm/amd/display: Have Payload Properly Created After
Resume
At drm suspend sequence, MST dc_sink is removed. When commit cached
MST stream back in drm resume sequence, the MST stream payload is not
properly created and added into the payload table. After resume, topology
change is reprobed by removing existing streams first. That leads to
no payload is found in the existing payload table as below error
"[drm] ERROR No payload for [MST PORT:] found in mst state"
1. In encoder .atomic_check routine, remove check existance of dc_sink
2. Bypass MST by checking existence of MST root port. dc_link_type cannot
differentiate MST port before topology is rediscovered.
Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
(cherry picked from https://patchwork.freedesktop.org/patch/537553/)
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f54d670ab3ab..0695c7c3d489 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2813,7 +2813,7 @@ static int dm_resume(void *handle)
* this is the case when traversing through already created
* MST connectors, should be skipped
*/
- if (aconnector->dc_link->type == dc_connection_mst_branch)
+ if (aconnector && aconnector->mst_root)
continue;
mutex_lock(&aconnector->hpd_lock);
@@ -6717,7 +6717,7 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
int clock, bpp = 0;
bool is_y420 = false;
- if (!aconnector->mst_output_port || !aconnector->dc_sink)
+ if (!aconnector->mst_output_port)
return 0;
mst_port = aconnector->mst_output_port;
--
2.40.1
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