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| author | Christian König <christian.koenig@amd.com> | 2015-02-10 14:26:39 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-18 13:31:24 +0100 |
| commit | 66e0c230e1449b0e1ccbc7805163a7aa426fb23f (patch) | |
| tree | 5de71cd0b99770e6b2250fa6cdc99e730e7c5af7 /drivers | |
| parent | 083619feef6d690b1592217a8e47c9386395c4ac (diff) | |
| download | lwn-66e0c230e1449b0e1ccbc7805163a7aa426fb23f.tar.gz lwn-66e0c230e1449b0e1ccbc7805163a7aa426fb23f.zip | |
drm/radeon: workaround for CP HW bug on CIK
commit a9c73a0e022c33954835e66fec3cd744af90ec98 upstream.
Emit the EOP twice to avoid cache flushing problems.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/radeon/cik.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index 40cb7280157d..f0ed0baddf70 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -3558,7 +3558,21 @@ void cik_fence_gfx_ring_emit(struct radeon_device *rdev, struct radeon_ring *ring = &rdev->ring[fence->ring]; u64 addr = rdev->fence_drv[fence->ring].gpu_addr; - /* EVENT_WRITE_EOP - flush caches, send int */ + /* Workaround for cache flush problems. First send a dummy EOP + * event down the pipe with seq one below. + */ + radeon_ring_write(ring, PACKET3(PACKET3_EVENT_WRITE_EOP, 4)); + radeon_ring_write(ring, (EOP_TCL1_ACTION_EN | + EOP_TC_ACTION_EN | + EVENT_TYPE(CACHE_FLUSH_AND_INV_TS_EVENT) | + EVENT_INDEX(5))); + radeon_ring_write(ring, addr & 0xfffffffc); + radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | + DATA_SEL(1) | INT_SEL(0)); + radeon_ring_write(ring, fence->seq - 1); + radeon_ring_write(ring, 0); + + /* Then send the real EOP event down the pipe. */ radeon_ring_write(ring, PACKET3(PACKET3_EVENT_WRITE_EOP, 4)); radeon_ring_write(ring, (EOP_TCL1_ACTION_EN | EOP_TC_ACTION_EN | |