RADEON_FP_GEN_CNTL
if (RREG32(RADEON_FP_GEN_CNTL) & RADEON_FP_DETECT_SENSE)
tmp = RREG32(RADEON_FP_GEN_CNTL);
WREG32(RADEON_FP_GEN_CNTL, tmp);
uint32_t fp_gen_cntl = RREG32(RADEON_FP_GEN_CNTL);
WREG32(RADEON_FP_GEN_CNTL, fp_gen_cntl);
fp_gen_cntl = (RREG32(RADEON_FP_GEN_CNTL) |
WREG32(RADEON_FP_GEN_CNTL, fp_gen_cntl);