Patchwork [22/81] drm/radeon/evergreen+: wait for the MC to settle after MC blackout

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Submitter Herton Ronaldo Krzesinski
Date Feb. 19, 2013, 6:48 p.m.
Message ID <1361299784-8830-23-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/221793/
State New
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Comments

Herton Ronaldo Krzesinski - Feb. 19, 2013, 6:48 p.m.
3.5.7.6 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@amd.com>

commit ed39fadd6df01095378e499fac3674883f16b853 upstream.

Some chips seem to need a little delay after blacking out
the MC before the requests actually stop.

May fix:
https://bugs.freedesktop.org/show_bug.cgi?id=56139
https://bugs.freedesktop.org/show_bug.cgi?id=57567

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 drivers/gpu/drm/radeon/evergreen.c |    2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 4170e1e..ccac010 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1183,6 +1183,8 @@  void evergreen_mc_stop(struct radeon_device *rdev, struct evergreen_mc_save *sav
 		blackout &= ~BLACKOUT_MODE_MASK;
 		WREG32(MC_SHARED_BLACKOUT_CNTL, blackout | 1);
 	}
+	/* wait for the MC to settle */
+	udelay(100);
 }
 
 void evergreen_mc_resume(struct radeon_device *rdev, struct evergreen_mc_save *save)