start_isoc_chain
start_isoc_chain(hw->fifos + HFCUSB_D_RX,
start_isoc_chain(hw->fifos + HFCUSB_PCM_RX,
start_isoc_chain(hw->fifos + HFCUSB_B1_RX,
start_isoc_chain(hw->fifos + HFCUSB_B2_RX,
start_isoc_chain(hw->fifos + HFCUSB_D_TX,
start_isoc_chain(hw->fifos + HFCUSB_B1_TX,
start_isoc_chain(hw->fifos + HFCUSB_B2_TX,