diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2014-11-17 15:08:17 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2014-11-20 11:11:43 -0500 |
| commit | 4bb62c95a7e781a238b2ab374f34b1bf91e01ddc (patch) | |
| tree | 9c0a3e022237745bd947eae81044feac041118da /drivers/gpu/drm/radeon/cik.c | |
| parent | 3feba08d79c32777a845c3c8a4ab93092bdf6f19 (diff) | |
| download | lwn-4bb62c95a7e781a238b2ab374f34b1bf91e01ddc.tar.gz lwn-4bb62c95a7e781a238b2ab374f34b1bf91e01ddc.zip | |
drm/radeon: work around a hw bug in MGCG on CIK
Always need to set bit 0 of RLC_CGTT_MGCG_OVERRIDE
to avoid unreliable doorbell updates in some cases.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/radeon/cik.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/cik.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index bce73b6203ac..cef4cb7e5438 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -6344,6 +6344,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable) } orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE); + data |= 0x00000001; data &= 0xfffffffd; if (orig != data) WREG32(RLC_CGTT_MGCG_OVERRIDE, data); @@ -6377,7 +6378,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable) } } else { orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE); - data |= 0x00000002; + data |= 0x00000003; if (orig != data) WREG32(RLC_CGTT_MGCG_OVERRIDE, data); |