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authorAlex Deucher <alexander.deucher@amd.com>2014-01-07 13:51:51 -0500
committerAlex Deucher <alexander.deucher@amd.com>2014-01-20 18:20:55 -0500
commit8097d94116d0c17e774ba4c8256e774018dc2a46 (patch)
tree5cc6e04ed8d4265e15fb22638f86319647896f27 /drivers/gpu/drm/radeon/rv770_dpm.c
parentd526fbdd0fd0e5d78cd2e01a5387ee83431da7fb (diff)
downloadblackbird-op-linux-8097d94116d0c17e774ba4c8256e774018dc2a46.tar.gz
blackbird-op-linux-8097d94116d0c17e774ba4c8256e774018dc2a46.zip
drm/radeon/dpm: disable mclk switching on desktop RV770
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
Diffstat (limited to 'drivers/gpu/drm/radeon/rv770_dpm.c')
-rw-r--r--drivers/gpu/drm/radeon/rv770_dpm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/rv770_dpm.c b/drivers/gpu/drm/radeon/rv770_dpm.c
index cb730cddfb9a..80c595aba359 100644
--- a/drivers/gpu/drm/radeon/rv770_dpm.c
+++ b/drivers/gpu/drm/radeon/rv770_dpm.c
@@ -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
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