linux-kernel - [PATCH 3.13 034/160] drm/radeon: disable mclk dpm on R7 260X

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Date:	Tue, 10 Jun 2014 12:44:34 -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 3.13 034/160] drm/radeon: disable mclk dpm on R7 260X

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

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

From: Alex Deucher <alexdeucher@...il.com>

commit 57700ad1f2f21d5d7ab7ee0e58d11b5954852434 upstream.

Setting higher mclks seems to cause stability issues
on some R7 260X boards.  Disable it for now for stability
until we find a proper fix.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=75992

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpu/drm/radeon/ci_dpm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 1ed4799..d4ca530 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -5128,6 +5128,10 @@ int ci_dpm_init(struct radeon_device *rdev)
 	pi->mclk_dpm_key_disabled = 0;
 	pi->pcie_dpm_key_disabled = 0;
 
+	/* mclk dpm is unstable on some R7 260X cards */
+	if (rdev->pdev->device == 0x6658)
+		pi->mclk_dpm_key_disabled = 1;
+
 	pi->caps_sclk_ds = true;
 
 	pi->mclk_strobe_mode_threshold = 40000;
-- 
1.9.1

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