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drm/radeon/dpm: disable mclk switching on desktop RV770

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Mclk switching doesn't seem to work reliably on these
cards.  Most RV770 boards specify the same mclk for all
performance levels anyway so in most cases, this has
no affect.

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=73067

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2014-01-07 13:51:51 -05:00
parent d526fbdd0f
commit 8097d94116
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/rv770_dpm.c
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@ -2536,6 +2536,12 @@ bool rv770_dpm_vblank_too_short(struct radeon_device *rdev)
(rdev->pdev->subsystem_device == 0x1c42))
switch_limit = 200;
/* RV770 */
/* mclk switching doesn't seem to work reliably on desktop RV770s */
if ((rdev->family == CHIP_RV770) &&
!(rdev->flags & RADEON_IS_MOBILITY))
switch_limit = 0xffffffff; /* disable mclk switching */
if (vblank_time < switch_limit)
return true;
else