drm/radeon: disable mclk dpm on R7 260X

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>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index cad89a97752709a68dbf4ecc7be99c78696c971c..6d395ec25c1379b6195d6625c4399c56660d698a 100644 (file)
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -5146,6 +5146,10 @@ 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;