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drm/amdgpu: Fix max_vblank_count value for current display engines

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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@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-09-22 10:06:45 -04:00
parent 71affda522
commit 5a6adfa20b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
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@ -140,7 +140,7 @@ void amdgpu_irq_preinstall(struct drm_device *dev)
*/
int amdgpu_irq_postinstall(struct drm_device *dev)
{
dev->max_vblank_count = 0x001fffff;
dev->max_vblank_count = 0x00ffffff;
return 0;
}