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

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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 13:14:14 -04:00
parent 7121316b6d
commit ab03d9fe50
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/ci_dpm.c
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@ -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