Commit 951caa6a authored Feb 18, 2015 by Alex Deucher

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

parent 3d2d98ee

drivers/gpu/drm/radeon/radeon_pm.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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
		*/