drm/radeon: use HDP_MEM_COHERENCY_FLUSH_CNTL for sdma as well

The new HDP flush method doesn't seem to work reliably on
sDMA either, so use the old method here too.

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 8d84ebe..9c9529d 100644 (file)
--- a/drivers/gpu/drm/radeon/cik_sdma.c
+++ b/drivers/gpu/drm/radeon/cik_sdma.c
@@ -102,14 +102,6 @@ void cik_sdma_fence_ring_emit(struct radeon_device *rdev,
 {
        struct radeon_ring *ring = &rdev->ring[fence->ring];
        u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
-       u32 extra_bits = (SDMA_POLL_REG_MEM_EXTRA_OP(1) |
-                         SDMA_POLL_REG_MEM_EXTRA_FUNC(3)); /* == */
-       u32 ref_and_mask;
-
-       if (fence->ring == R600_RING_TYPE_DMA_INDEX)
-               ref_and_mask = SDMA0;
-       else
-               ref_and_mask = SDMA1;
 
        /* write the fence */
        radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_FENCE, 0, 0));
@@ -119,12 +111,12 @@ void cik_sdma_fence_ring_emit(struct radeon_device *rdev,
        /* generate an interrupt */
        radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_TRAP, 0, 0));
        /* flush HDP */
-       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, (4 << 16) | 10); /* RETRY_COUNT, POLL_INTERVAL */
+       /* 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);
 }
 
 /**
@@ -720,18 +712,10 @@ void cik_sdma_vm_set_page(struct radeon_device *rdev,
 void cik_dma_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm)
 {
        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;
 
        if (vm == NULL)
                return;
 
-       if (ridx == R600_RING_TYPE_DMA_INDEX)
-               ref_and_mask = SDMA0;
-       else
-               ref_and_mask = SDMA1;
-
        radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_SRBM_WRITE, 0, 0xf000));
        if (vm->id < 8) {
                radeon_ring_write(ring, (VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (vm->id << 2)) >> 2);
@@ -766,12 +750,12 @@ void cik_dma_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm
        radeon_ring_write(ring, VMID(0));
 
        /* flush HDP */
-       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, (4 << 16) | 10); /* RETRY_COUNT, POLL_INTERVAL */
+       /* 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);
 
        /* flush TLB */
        radeon_ring_write(ring, SDMA_PACKET(SDMA_OPCODE_SRBM_WRITE, 0, 0xf000));