This is a note to let you know that I've just added the patch titled
drm/amd/display: Clear MST topology if it fails to resume
to the 6.2-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-clear-mst-topology-if-it-fails-to-resume.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3f6752b4de41896c7f1609b1585db2080e8150d8 Mon Sep 17 00:00:00 2001
From: Roman Li <roman.li@xxxxxxx>
Date: Thu, 1 Dec 2022 09:49:23 -0500
Subject: drm/amd/display: Clear MST topology if it fails to resume
From: Roman Li <roman.li@xxxxxxx>
commit 3f6752b4de41896c7f1609b1585db2080e8150d8 upstream.
[Why]
In case of failure to resume MST topology after suspend, an emtpty
mst tree prevents further mst hub detection on the same connector.
That causes the issue with MST hub hotplug after it's been unplug in
suspend.
[How]
Stop topology manager on the connector after detecting DM_MST failure.
Reviewed-by: Wayne Lin <Wayne.Lin@xxxxxxx>
Acked-by: Jasdeep Dhillon <jdhillon@xxxxxxx>
Signed-off-by: Roman Li <roman.li@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "Limonciello, Mario" <Mario.Limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2183,6 +2183,8 @@ static int detect_mst_link_for_all_conne
DRM_ERROR("DM_MST: Failed to start MST\n");
aconnector->dc_link->type =
dc_connection_single;
+ ret = dm_helpers_dp_mst_stop_top_mgr(aconnector->dc_link->ctx,
+ aconnector->dc_link);
break;
}
}
Patches currently in stable-queue which might be from roman.li@xxxxxxx are
queue-6.2/drm-amd-display-clear-mst-topology-if-it-fails-to-resume.patch
