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drm/amdgpu/ci: disable mclk switching for high refresh rates (v2) 

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

v2: fix logic inversion (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Cc: stable@vger.kernel.org
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-05-11 13:10:02 -04:00
parent b3c85a0fb2
commit 0a646f331d
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdgpu/ci_dpm.c
View File

@ -906,6 +906,12 @@ static bool ci_dpm_vblank_too_short(struct amdgpu_device *adev)
u32 vblank_time = amdgpu_dpm_get_vblank_time(adev);
u32 switch_limit = adev->mc.vram_type == AMDGPU_VRAM_TYPE_GDDR5 ? 450 : 300;
/* disable mclk switching if the refresh is >120Hz, even if the
* blanking period would allow it
*/
if (amdgpu_dpm_get_vrefresh(adev) > 120)
return true;
if (vblank_time < switch_limit)
return true;
else