Commit a844f8d2 authored May 11, 2017 by Alex Deucher Committed by Greg Kroah-Hartman Jul 27, 2017

drm/radeon/ci: disable mclk switching for high refresh rates (v2)

commit ab03d9fe508f4e2914a8f4a9eef1b21051cacd0f upstream.

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

v2: fix logic inversion (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868



Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent b85007c9

drivers/gpu/drm/radeon/ci_dpm.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -776,6 +776,12 @@ bool ci_dpm_vblank_too_short(struct radeon_device *rdev)
		u32 vblank_time = r600_dpm_get_vblank_time(rdev);
		u32 switch_limit = pi->mem_gddr5 ? 450 : 300;

		/* disable mclk switching if the refresh is >120Hz, even if the
		* blanking period would allow it
		*/
		if (r600_dpm_get_vrefresh(rdev) > 120)
		return true;

		/* disable mclk switching if the refresh is >120Hz, even if the
		* blanking period would allow it
		*/