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authorAlex Deucher <alexander.deucher@amd.com>2017-05-11 13:14:14 -0400
committerAlex Deucher <alexander.deucher@amd.com>2017-05-24 16:45:03 -0400
commit58d7e3e427db1bd68f33025519a9468140280a75 (patch)
tree1571563279328c6119f42c71d85f9b177435d3bf /drivers/gpu/drm
parent0a646f331db0eb9efc8d3a95a44872036d441d58 (diff)
downloadlinux-58d7e3e427db1bd68f33025519a9468140280a75.tar.bz2
drm/radeon/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>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/radeon/ci_dpm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 7ba450832e6b..ea36dc4dd5d2 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -776,6 +776,12 @@ bool ci_dpm_vblank_too_short(struct radeon_device *rdev)
u32 vblank_time = r600_dpm_get_vblank_time(rdev);
u32 switch_limit = pi->mem_gddr5 ? 450 : 300;
+ /* disable mclk switching if the refresh is >120Hz, even if the
+ * blanking period would allow it
+ */
+ if (r600_dpm_get_vrefresh(rdev) > 120)
+ return true;
+
if (vblank_time < switch_limit)
return true;
else