drm/radeon: fix fence driver for dma ring when wb is disabled

The dma ring can't write to register thus have to write to memory
its fence value. This ensure that it doesn't try to use scratch
register for dma ring fence driver.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=58166

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r600.c

@@ -2533,11 +2533,12 @@ void r600_dma_fence_ring_emit(struct radeon_device *rdev,
 {
 	struct radeon_ring *ring = &rdev->ring[fence->ring];
 	u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
+
 	/* write the fence */
 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0));
 	radeon_ring_write(ring, addr & 0xfffffffc);
 	radeon_ring_write(ring, (upper_32_bits(addr) & 0xff));
-	radeon_ring_write(ring, fence->seq);
+	radeon_ring_write(ring, lower_32_bits(fence->seq));
 	/* generate an interrupt */
 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0));
 }

drivers/gpu/drm/radeon/radeon_fence.c

@@ -772,7 +772,7 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
 	int r;
 
 	radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
-	if (rdev->wb.use_event) {
+	if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) {
 		rdev->fence_drv[ring].scratch_reg = 0;
 		index = R600_WB_EVENT_OFFSET + ring * 4;
 	} else {