This is a note to let you know that I've just added the patch titled
drm/amdgpu: Fix max_vblank_count value for current display engines
to the 4.2-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-amdgpu-fix-max_vblank_count-value-for-current-display-engines.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5a6adfa20b622a273205e33b20c12332aa7eb724 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Tue, 22 Sep 2015 10:06:45 -0400
Subject: drm/amdgpu: Fix max_vblank_count value for current display engines
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From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 5a6adfa20b622a273205e33b20c12332aa7eb724 upstream.
The value was much too low, which could cause the userspace visible
vblank counter to move backwards when the hardware counter wrapped
around.
Ported from radeon commit:
b0b9bb4dd51f396dcf843831905f729e74b0c8c0
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Jammy Zhou <Jammy.Zhou@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -140,7 +140,7 @@ void amdgpu_irq_preinstall(struct drm_de
*/
int amdgpu_irq_postinstall(struct drm_device *dev)
{
- dev->max_vblank_count = 0x001fffff;
+ dev->max_vblank_count = 0x00ffffff;
return 0;
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.2/drm-amdgpu-restore-lcd-backlight-level-on-resume.patch
queue-4.2/drm-amdgpu-fix-max_vblank_count-value-for-current-display-engines.patch
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