CP_RB_WPTR_POLL_CNTL
WREG32_FIELD(CP_RB_WPTR_POLL_CNTL, IDLE_POLL_COUNT, 0x60);
data = RREG32(CP_RB_WPTR_POLL_CNTL);
WREG32(CP_RB_WPTR_POLL_CNTL, data);