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drm/amdgpu: Correct sdma_v4 get_wptr(v2)

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the original method will change the wptr value in wb.
v2:
furthur cleanup

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Emily Deng 2018-02-07 16:17:16 +08:00 committed by Alex Deucher
parent a0aaa03062
commit 8d333fe0ad
1 changed files with 7 additions and 11 deletions
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18
drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
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@ -238,31 +238,27 @@ static uint64_t sdma_v4_0_ring_get_rptr(struct amdgpu_ring *ring)
static uint64_t sdma_v4_0_ring_get_wptr(struct amdgpu_ring *ring)
{
struct amdgpu_device *adev = ring->adev;
u64 *wptr = NULL;
uint64_t local_wptr = 0;
u64 wptr;
if (ring->use_doorbell) {
/* XXX check if swapping is necessary on BE */
wptr = ((u64 *)&adev->wb.wb[ring->wptr_offs]);
DRM_DEBUG("wptr/doorbell before shift == 0x%016llx\n", *wptr);
*wptr = (*wptr) >> 2;
DRM_DEBUG("wptr/doorbell after shift == 0x%016llx\n", *wptr);
wptr = READ_ONCE(*((u64 *)&adev->wb.wb[ring->wptr_offs]));
DRM_DEBUG("wptr/doorbell before shift == 0x%016llx\n", wptr);
} else {
u32 lowbit, highbit;
int me = (ring == &adev->sdma.instance[0].ring) ? 0 : 1;
wptr = &local_wptr;
lowbit = RREG32(sdma_v4_0_get_reg_offset(adev, me, mmSDMA0_GFX_RB_WPTR)) >> 2;
highbit = RREG32(sdma_v4_0_get_reg_offset(adev, me, mmSDMA0_GFX_RB_WPTR_HI)) >> 2;
DRM_DEBUG("wptr [%i]high== 0x%08x low==0x%08x\n",
me, highbit, lowbit);
*wptr = highbit;
*wptr = (*wptr) << 32;
*wptr |= lowbit;
wptr = highbit;
wptr = wptr << 32;
wptr |= lowbit;
}
return *wptr;
return wptr >> 2;
}
/**