This is a note to let you know that I've just added the patch titled
drm/amd/display: pbn_div need be updated for hotplug event
to the 6.6-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-pbn_div-need-be-updated-for-hotplug-event.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9cdef4f720376ef0fb0febce1ed2377c19e531f9 Mon Sep 17 00:00:00 2001
From: Wayne Lin <wayne.lin@xxxxxxx>
Date: Mon, 4 Dec 2023 10:09:33 +0800
Subject: drm/amd/display: pbn_div need be updated for hotplug event
From: Wayne Lin <wayne.lin@xxxxxxx>
commit 9cdef4f720376ef0fb0febce1ed2377c19e531f9 upstream.
link_rate sometime will be changed when DP MST connector hotplug, so
pbn_div also need be updated; otherwise, it will mismatch with
link_rate, causes no output in external monitor.
This is a backport to 6.7 and older.
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Reviewed-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Signed-off-by: Wade Wang <wade.wang@xxxxxx>
Signed-off-by: Wayne Lin <wayne.lin@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6868,8 +6868,7 @@ static int dm_encoder_helper_atomic_chec
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);
- if (!mst_state->pbn_div)
- mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_root->dc_link);
+ mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_root->dc_link);
if (!state->duplicated) {
int max_bpc = conn_state->max_requested_bpc;
Patches currently in stable-queue which might be from wayne.lin@xxxxxxx are
queue-6.6/drm-amd-display-pbn_div-need-be-updated-for-hotplug-event.patch
