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drm/amdgpu: replace readq/writeq with atomic64 operations

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what we really want is a read or write that is guaranteed to be 64 bits
at a time, atomic64 operations are supported on all architectures

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tao Zhou 2019-08-07 10:28:54 +08:00 committed by Alex Deucher
parent 2a1e00c3c0
commit c6dddf4540
1 changed files with 2 additions and 6 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -273,14 +273,10 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
*/
uint64_t amdgpu_mm_rreg64(struct amdgpu_device *adev, uint32_t reg)
{
uint64_t ret;
if ((reg * 4) < adev->rmmio_size)
ret = readq(((void __iomem *)adev->rmmio) + (reg * 4));
return atomic64_read((atomic64_t *)(adev->rmmio + (reg * 4)));
else
BUG();
return ret;
}
/**
@ -295,7 +291,7 @@ uint64_t amdgpu_mm_rreg64(struct amdgpu_device *adev, uint32_t reg)
void amdgpu_mm_wreg64(struct amdgpu_device *adev, uint32_t reg, uint64_t v)
{
if ((reg * 4) < adev->rmmio_size)
writeq(v, ((void __iomem *)adev->rmmio) + (reg * 4));
atomic64_set((atomic64_t *)(adev->rmmio + (reg * 4)), v);
else
BUG();
}