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drm/amdgpu: Add SOC15_WAIT_ON_RREG macro define

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Add new macro to wait on a register field to be a specific
value.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rex Zhu 2018-05-17 15:58:53 +08:00 • committed by Alex Deucher
commit ac06b4cfd7
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/amd/amdgpu/soc15_common.h
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@ -47,6 +47,21 @@
#define WREG32_SOC15_OFFSET(ip, inst, reg, offset, value) \
WREG32((adev->reg_offset[ip##_HWIP][inst][reg##_BASE_IDX] + reg) + offset, value)
#define SOC15_WAIT_ON_RREG(ip, inst, reg, expected_value, mask, ret) \
do { \
uint32_t tmp_ = RREG32(adev->reg_offset[ip##_HWIP][inst][reg##_BASE_IDX] + reg); \
uint32_t loop = adev->usec_timeout; \
while ((tmp_ & (mask)) != (expected_value)) { \
udelay(2); \
tmp_ = RREG32(adev->reg_offset[ip##_HWIP][inst][reg##_BASE_IDX] + reg); \
loop--; \
if (!loop) { \
ret = -ETIMEDOUT; \
break; \
} \
} \
} while (0)
#endif