linux-kernel - [PATCH 3.19.y-ckt 26/56] drm/radeon: add a dpm quirk for all R7 370 parts

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Date:	Tue, 12 Apr 2016 13:58:44 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alex Deucher <alexander.deucher@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 26/56] drm/radeon: add a dpm quirk for all R7 370 parts

3.19.8-ckt19 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpu/drm/radeon/si_dpm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index 7c64470..97a3862 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -2956,6 +2956,10 @@ static void si_apply_state_adjust_rules(struct radeon_device *rdev,
 		}
 		++p;
 	}
+	/* limit mclk on all R7 370 parts for stability */
+	if (rdev->pdev->device == 0x6811 &&
+	    rdev->pdev->revision == 0x81)
+		max_mclk = 120000;
 
 	if ((rdev->pm.dpm.new_active_crtc_count > 1) ||
 	    ni_dpm_vblank_too_short(rdev))
-- 
2.7.4