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drm/radeon: disable mclk switching with 120hz+ monitors 

These tend to be problematic even if the vblank period is
long enough.  This needs more investigation across a wider
range of displays.  Disable for now.

bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=87796
https://bugs.freedesktop.org/show_bug.cgi?id=89198

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-02-18 00:59:45 -05:00
parent 3d2d98ee1a
commit 951caa6acf
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/radeon_pm.c
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@ -852,6 +852,12 @@ static struct radeon_ps *radeon_dpm_pick_power_state(struct radeon_device *rdev,
single_display = false;
}
/* 120hz tends to be problematic even if they are under the
* vblank limit.
*/
if (single_display && (r600_dpm_get_vrefresh(rdev) >= 120))
single_display = false;
/* certain older asics have a separare 3D performance state,
* so try that first if the user selected performance
*/