This is a note to let you know that I've just added the patch titled
drm/amdgpu: fix pstate setting issue
to the 6.0-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-amdgpu-fix-pstate-setting-issue.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 79610d3041338dc1ef554d6fd8b3b3e23be527f5 Mon Sep 17 00:00:00 2001
From: Chengming Gui <Jack.Gui@xxxxxxx>
Date: Tue, 18 Oct 2022 17:31:38 +0800
Subject: drm/amdgpu: fix pstate setting issue
From: Chengming Gui <Jack.Gui@xxxxxxx>
commit 79610d3041338dc1ef554d6fd8b3b3e23be527f5 upstream.
[WHY]
0, original pstate X
1, ctx_A_create -> ctx_A->stable_pstate = X
2, ctx_A_set_pstate (Y) -> current pstate is Y (PEAK or STANDARD)
3, ctx_B_create -> ctx_B->stable_pstate = Y
4, ctx_A_destroy -> restore pstate to X
5, ctx_B_destroy -> restore pstate to Y
Above sequence will cause final pstate is wrong (Y), should be original X.
[HOW]
When ctx_B create,
if ctx_A touched pstate setting
(not auto, stable_pstate_ctx != NULL),
set ctx_B->stable_pstate the same value as ctx_A saved,
if stable_pstate_ctx == NULL,
fetch current pstate to fill
ctx_B->stable_pstate.
Signed-off-by: Chengming Gui <Jack.Gui@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -327,7 +327,10 @@ static int amdgpu_ctx_init(struct amdgpu
if (r)
return r;
- ctx->stable_pstate = current_stable_pstate;
+ if (mgr->adev->pm.stable_pstate_ctx)
+ ctx->stable_pstate = mgr->adev->pm.stable_pstate_ctx->stable_pstate;
+ else
+ ctx->stable_pstate = current_stable_pstate;
return 0;
}
Patches currently in stable-queue which might be from Jack.Gui@xxxxxxx are
queue-6.0/drm-amdgpu-fix-pstate-setting-issue.patch
