From: Alex Deucher Date: Thu, 31 Jan 2013 14:01:59 +0000 (-0500) Subject: drm/radeon/r5xx-r7xx: wait for the MC to settle after MC blackout X-Git-Tag: v3.8-rc7~23^2^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=39dc9aabd8708944031e6307819b2a794b841f83;p=platform%2Fkernel%2Flinux-exynos.git drm/radeon/r5xx-r7xx: wait for the MC to settle after MC blackout Some chips seem to need a little delay after blacking out the MC before the requests actually stop. Stop DMAR errors reported by Shuah Khan. Reported-by: Shuah Khan Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/radeon/rv515.c b/drivers/gpu/drm/radeon/rv515.c index 2bb6d0e..435ed35 100644 --- a/drivers/gpu/drm/radeon/rv515.c +++ b/drivers/gpu/drm/radeon/rv515.c @@ -336,6 +336,8 @@ void rv515_mc_stop(struct radeon_device *rdev, struct rv515_mc_save *save) WREG32(R600_CITF_CNTL, blackout); } } + /* wait for the MC to settle */ + udelay(100); } void rv515_mc_resume(struct radeon_device *rdev, struct rv515_mc_save *save)