linux-kernel - [PATCH 3.16 150/217] drm/radeon: add a dpm quirk for all R7 370 parts

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Date:	Wed, 27 Apr 2016 01:02:21 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Alex Deucher" <alexander.deucher@....com>
Subject: [PATCH 3.16 150/217] drm/radeon: add a dpm quirk for all R7 370 parts

3.16.35-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit 0e5585dc870af947fab2af96a88c2d8b4270247c upstream.

Higher mclk values are not stable due to a bug somewhere.
Limit them for now.

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/radeon/si_dpm.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -3017,6 +3017,10 @@ static void si_apply_state_adjust_rules(
 				ps->performance_levels[i].sclk = max_sclk;
 		}
 	}
+	/* limit mclk on all R7 370 parts for stability */
+	if (rdev->pdev->device == 0x6811 &&
+	    rdev->pdev->revision == 0x81)
+		max_mclk = 120000;
 
 	/* XXX validate the min clocks required for display */