DEEP_SLEEP_CNTL
u32 ds_en = RREG32(DEEP_SLEEP_CNTL) & ENABLE_DS;
WREG32_P(DEEP_SLEEP_CNTL, 0, ~ENABLE_DS);
WREG32_P(DEEP_SLEEP_CNTL, ENABLE_DS, ~ENABLE_DS);
u32 deep_sleep_cntl = RREG32(DEEP_SLEEP_CNTL);
WREG32(DEEP_SLEEP_CNTL, deep_sleep_cntl);
WREG32_P(DEEP_SLEEP_CNTL, 0, ~ENABLE_DS);