This is a note to let you know that I've just added the patch titled
drm/amd/display: Disable MPC split by default on special asic
to the 5.15-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-disable-mpc-split-by-default-on-special-asic.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a460beefe77d780ac48f19d39333852a7f93ffc1 Mon Sep 17 00:00:00 2001
From: Zhikai Zhai <zhikai.zhai@xxxxxxx>
Date: Fri, 30 Jun 2023 11:35:14 +0800
Subject: drm/amd/display: Disable MPC split by default on special asic
From: Zhikai Zhai <zhikai.zhai@xxxxxxx>
commit a460beefe77d780ac48f19d39333852a7f93ffc1 upstream.
[WHY]
All of pipes will be used when the MPC split enable on the dcn
which just has 2 pipes. Then MPO enter will trigger the minimal
transition which need programe dcn from 2 pipes MPC split to 2
pipes MPO. This action will cause lag if happen frequently.
[HOW]
Disable the MPC split for the platform which dcn resource is limited
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Alvin Lee <alvin.lee2@xxxxxxx>
Acked-by: Alan Liu <haoping.liu@xxxxxxx>
Signed-off-by: Zhikai Zhai <zhikai.zhai@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c
@@ -193,7 +193,7 @@ static const struct dc_debug_options deb
.timing_trace = false,
.clock_trace = true,
.disable_pplib_clock_request = true,
- .pipe_split_policy = MPC_SPLIT_DYNAMIC,
+ .pipe_split_policy = MPC_SPLIT_AVOID,
.force_single_disp_pipe_split = false,
.disable_dcc = DCC_ENABLE,
.vsr_support = true,
Patches currently in stable-queue which might be from zhikai.zhai@xxxxxxx are
queue-5.15/drm-amd-display-disable-mpc-split-by-default-on-special-asic.patch
