MAX_WAIT_US
status = dmub_srv_wait_for_inbox0_ack(dmub, MAX_WAIT_US);
status = dmub_srv_wait_for_idle(dmub, MAX_WAIT_US);
status = dmub_srv_wait_for_inbox_free(dmub, MAX_WAIT_US, count - i);
status = dmub_srv_wait_for_idle(dmub, MAX_WAIT_US);
status = dmub_srv_wait_for_pending(dmub, MAX_WAIT_US);