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-rw-r--r--drivers/gpu/drm/radeon/r100.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 11c9a3fe6810..626e79023e30 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -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));