[PATCH 3.14 068/228] drm/radeon: disable mclk dpm on R7 260X

Greg Kroah-Hartman
2014-06-04T23:21:32Z

From: Alex Deucher <alexdeucher@gmail.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@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/radeon/ci_dpm.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -5106,6 +5106,10 @@ int ci_dpm_init(struct radeon_device *rd
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;