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drm/amdgpu/sdma3: set wptr shadow atomically

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Port it from sdma4 for wptr polling usage.

Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Xiangliang.Yu 2017-09-13 10:58:19 +08:00 • committed by Alex Deucher
parent e33dac39bc
commit 3e4b0bd960
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
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@ -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;