musb_h_flush_rxfifo
musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG);
csr = musb_h_flush_rxfifo(ep, 0);
musb_h_flush_rxfifo(hw_ep, csr);
musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);