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authorChristian König <christian.koenig@amd.com>2015-02-10 14:26:39 +0100
committerAlex Deucher <alexander.deucher@amd.com>2015-02-11 12:01:34 -0500
commita9c73a0e022c33954835e66fec3cd744af90ec98 (patch)
treec1e1a13ca170cb846a2226c88c2bc2aa2a27bb7c /drivers/gpu
parenta53fa43873b88bad15a2eb1f01dc5efa689625ce (diff)
drm/radeon: workaround for CP HW bug on CIK
Emit the EOP twice to avoid cache flushing problems. Signed-off-by: Christian König <christian.koenig@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/radeon/cik.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index de77c27d810..55944163dfe 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -3905,7 +3905,21 @@ 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 |