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authorAlex Deucher <alexander.deucher@amd.com>2015-02-18 08:59:45 +0300
committerAlex Deucher <alexander.deucher@amd.com>2015-02-26 00:06:06 +0300
commit951caa6acf7121f88a9e8e04ef75bd0ac323a033 (patch)
tree1e82d51da5c576daa8715d11d41ac3ff0438c58f /drivers/gpu/drm
parent3d2d98ee1af0cf6eebfbd6bff4c17d3601ac1284 (diff)
downloadlinux-951caa6acf7121f88a9e8e04ef75bd0ac323a033.tar.xz
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
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/radeon/radeon_pm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 9f758d39420d..33cf4108386d 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -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
*/