EP_DEFERRED_DRDY
priv_ep->flags |= EP_DEFERRED_DRDY;
if (priv_ep->flags & EP_DEFERRED_DRDY) {
priv_ep->flags &= ~EP_DEFERRED_DRDY;
if (pep->ep_state & EP_DEFERRED_DRDY) {
pep->ep_state &= ~EP_DEFERRED_DRDY;
if (pep->ep_state & EP_DEFERRED_DRDY) {
pep->ep_state &= ~EP_DEFERRED_DRDY;
pep->ep_state |= EP_DEFERRED_DRDY;