drm/radeon: disable mclk dpm on R7 260X

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>

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 8d49104..28d636a 100644 (file)
--- 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 *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;