[PATCH] drm/amdgpu: correct wptr initialization for sdma

[Yintian Tao]

If doorbell is used for wptr update, we also need to use it
to initialize wptr to 0.

Change-Id: Ieb31a6726a9ac8d45e51f0370ef5f77dc5ec7c06
Signed-off-by: Yintian Tao <yttao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
index cfd968e..a154faf 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
@@ -643,8 +643,9 @@ static int sdma_v3_0_gfx_resume(struct amdgpu_device *adev)
 		WREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i], rb_cntl);
 
 		/* Initialize the ring buffer's read and write pointers */
+		ring->wptr = 0;
 		WREG32(mmSDMA0_GFX_RB_RPTR + sdma_offsets[i], 0);
-		WREG32(mmSDMA0_GFX_RB_WPTR + sdma_offsets[i], 0);
+		sdma_v3_0_ring_set_wptr(ring);
 		WREG32(mmSDMA0_GFX_IB_RPTR + sdma_offsets[i], 0);
 		WREG32(mmSDMA0_GFX_IB_OFFSET + sdma_offsets[i], 0);
 
-- 
1.9.1