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authorAlex Deucher <alexander.deucher@amd.com>2017-05-11 13:10:02 -0400
committerAlex Deucher <alexander.deucher@amd.com>2017-05-24 16:44:26 -0400
commit0a646f331db0eb9efc8d3a95a44872036d441d58 (patch)
tree8853448bbf12daf955452fb40e40817a22c0f3ad /drivers
parentb3c85a0fb2c79f2c945fa1305b39974d0acf3105 (diff)
downloadleg-kernel-0a646f331db0eb9efc8d3a95a44872036d441d58.tar.gz
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 K├Ânig <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/ci_dpm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
index 6dc1410b380f..ec93714e4524 100644
--- a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
@@ -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