drm/radeon/cik: use POLL_REG_MEM special op for sDMA HDP flush

This is the preferred flushing method on CIK.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/cik_sdma.c b/drivers/gpu/drm/radeon/cik_sdma.c
index d7e51c0..9abea87 100644 (file)
--- a/drivers/gpu/drm/radeon/cik_sdma.c
+++ b/drivers/gpu/drm/radeon/cik_sdma.c
@@ -168,13 +168,21 @@ static void cik_sdma_hdp_flush_ring_emit(struct radeon_device *rdev,
                                         int ridx)
 {
        struct radeon_ring *ring = &rdev->ring[ridx];
+       u32 extra_bits = (SDMA_POLL_REG_MEM_EXTRA_OP(1) |
+                         SDMA_POLL_REG_MEM_EXTRA_FUNC(3)); /* == */
+       u32 ref_and_mask;
 
-       /* We should be using the new POLL_REG_MEM special op packet here
-        * but it causes sDMA to hang sometimes
-        */
-       radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_SRBM_WRITE, 0, 0xf000));
-       radeon_ring_write(ring, HDP_MEM_COHERENCY_FLUSH_CNTL >> 2);
-       radeon_ring_write(ring, 0);
+       if (ridx == R600_RING_TYPE_DMA_INDEX)
+               ref_and_mask = SDMA0;
+       else
+               ref_and_mask = SDMA1;
+
+       radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_POLL_REG_MEM, 0, extra_bits));
+       radeon_ring_write(ring, GPU_HDP_FLUSH_DONE);
+       radeon_ring_write(ring, GPU_HDP_FLUSH_REQ);
+       radeon_ring_write(ring, ref_and_mask); /* reference */
+       radeon_ring_write(ring, ref_and_mask); /* mask */
+       radeon_ring_write(ring, (0xfff << 16) | 10); /* retry count, poll interval */
 }
 
 /**