linux-kernel - [PATCH 3.12 074/176] drm/radeon: work around a hw bug in MGCG on CIK

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Message-Id: <5d531ee5e76b84da1c114dddd9077d1e3a2d1ff7.1422455352.git.jslaby@suse.cz>
Date:	Wed, 28 Jan 2015 15:28:24 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 074/176] drm/radeon: work around a hw bug in MGCG on CIK

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 4bb62c95a7e781a238b2ab374f34b1bf91e01ddc upstream.

Always need to set bit 0 of RLC_CGTT_MGCG_OVERRIDE
to avoid unreliable doorbell updates in some cases.

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/radeon/cik.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 0fc5fd6b3b41..cdc7f408bd18 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -5167,6 +5167,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable)
 		}
 
 		orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE);
+		data |= 0x00000001;
 		data &= 0xfffffffd;
 		if (orig != data)
 			WREG32(RLC_CGTT_MGCG_OVERRIDE, data);
@@ -5198,7 +5199,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable)
 		}
 	} else {
 		orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE);
-		data |= 0x00000002;
+		data |= 0x00000003;
 		if (orig != data)
 			WREG32(RLC_CGTT_MGCG_OVERRIDE, data);
 
-- 
2.2.2

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