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drm/amdgpu:Improves robustness of SOC15_WAIT_ON_RREG 

If register value is updating, reset timeout counter.
It improves robustness of SOC15_WAIT_ON_RREG.

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
James Zhu 2018-12-17 08:35:05 -05:00 committed by Alex Deucher
parent 9194fb22dd
commit 7ab3f021bb
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/amd/amdgpu/soc15_common.h
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@ -49,14 +49,19 @@
#define SOC15_WAIT_ON_RREG(ip, inst, reg, expected_value, mask, ret) \
do { \
uint32_t old_ = 0; \
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); \
if (old_ != tmp_) { \
loop = adev->usec_timeout; \
old_ = tmp_; \
} else \
udelay(1); \
tmp_ = RREG32(adev->reg_offset[ip##_HWIP][inst][reg##_BASE_IDX] + reg); \
loop--; \
if (!loop) { \
DRM_ERROR("Register(%d) [%s] failed to reach value 0x%08x != 0x%08x\n", \
DRM_WARN("Register(%d) [%s] failed to reach value 0x%08x != 0x%08x\n", \
inst, #reg, (unsigned)expected_value, (unsigned)(tmp_ & (mask))); \
ret = -ETIMEDOUT; \
break; \