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drm/r100/kms: Emit cache flush to the end of command buffer. (v2)

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Cache flush is required in case CPU is accessing rendered data.

This fixes glean/readPixSanity test case and random rendering
errors in sauerbraten and warzone2100.

v2 Fix comment ordering in r100_fence_ring_emit and remove extra
   defines added in first version.

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Pauli Nieminen 2010-02-04 19:20:53 +02:00 committed by Dave Airlie
parent 062b389c87
commit 9e5b2af75a
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/radeon/r100.c
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@ -354,11 +354,17 @@ u32 r100_get_vblank_counter(struct radeon_device *rdev, int crtc)
return RREG32(RADEON_CRTC2_CRNT_FRAME);
}
/* Who ever call radeon_fence_emit should call ring_lock and ask
* for enough space (today caller are ib schedule and buffer move) */
void r100_fence_ring_emit(struct radeon_device *rdev,
struct radeon_fence *fence)
{
/* Who ever call radeon_fence_emit should call ring_lock and ask
* for enough space (today caller are ib schedule and buffer move) */
/* We have to make sure that caches are flushed before
* CPU might read something from VRAM. */
radeon_ring_write(rdev, PACKET0(RADEON_RB3D_DSTCACHE_CTLSTAT, 0));
radeon_ring_write(rdev, RADEON_RB3D_DC_FLUSH_ALL);
radeon_ring_write(rdev, PACKET0(RADEON_RB3D_ZCACHE_CTLSTAT, 0));
radeon_ring_write(rdev, RADEON_RB3D_ZC_FLUSH_ALL);
/* Wait until IDLE & CLEAN */
radeon_ring_write(rdev, PACKET0(0x1720, 0));
radeon_ring_write(rdev, (1 << 16) | (1 << 17));