diff options
| author | Michel Dänzer <michel.daenzer@amd.com> | 2011-09-13 11:27:35 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2011-09-14 13:35:35 +0100 |
| commit | 87463ff83bcda210d8f0ae440bd64d1548f852e7 (patch) | |
| tree | fd998d5b0e921d3d7aa3e60ea4046e9660ab2574 /drivers/gpu/drm/radeon/r600.c | |
| parent | ff02b13f6867af72682d7a9bb9bd705f9af2bab0 (diff) | |
drm/radeon: Don't read from CP ring write pointer registers.
Apparently this doesn't always work reliably, e.g. at resume time.
Just initialize to 0, so the ring is considered empty.
Tested with hibernation on Sumo and Cayman cards.
Should fix https://bugs.launchpad.net/ubuntu/+source/linux/+bug/820746/ .
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r600.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r600.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index aa5571b73aa..c68427612e3 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -2209,7 +2209,8 @@ int r600_cp_resume(struct radeon_device *rdev) /* Initialize the ring buffer's read and write pointers */ WREG32(CP_RB_CNTL, tmp | RB_RPTR_WR_ENA); WREG32(CP_RB_RPTR_WR, 0); - WREG32(CP_RB_WPTR, 0); + rdev->cp.wptr = 0; + WREG32(CP_RB_WPTR, rdev->cp.wptr); /* set the wb address whether it's enabled or not */ WREG32(CP_RB_RPTR_ADDR, @@ -2231,7 +2232,6 @@ int r600_cp_resume(struct radeon_device *rdev) WREG32(CP_DEBUG, (1 << 27) | (1 << 28)); rdev->cp.rptr = RREG32(CP_RB_RPTR); - rdev->cp.wptr = RREG32(CP_RB_WPTR); r600_cp_start(rdev); rdev->cp.ready = true; |