From 4c8ef550cc3b02c7c783364ae8006c3c3d75b244 Mon Sep 17 00:00:00 2001 From: "Xiangliang.Yu" Date: Wed, 13 Sep 2017 10:58:19 +0800 Subject: [PATCH 1832/4131] drm/amdgpu/sdma3: set wptr shadow atomically Port it from sdma4 for wptr polling usage. Signed-off-by: Xiangliang.Yu Reviewed-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 4 +++- 1 file changed, 3 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 7b97ce8..10a0ceb 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c @@ -379,8 +379,10 @@ static void sdma_v3_0_ring_set_wptr(struct amdgpu_ring *ring) struct amdgpu_device *adev = ring->adev; if (ring->use_doorbell) { + u32 *wb = (u32 *)&adev->wb.wb[ring->wptr_offs]; + /* XXX check if swapping is necessary on BE */ - adev->wb.wb[ring->wptr_offs] = lower_32_bits(ring->wptr) << 2; + WRITE_ONCE(*wb, (lower_32_bits(ring->wptr) << 2)); WDOORBELL32(ring->doorbell_index, lower_32_bits(ring->wptr) << 2); } else { int me = (ring == &ring->adev->sdma.instance[0].ring) ? 0 : 1; -- 2.7.4