940     struct xhci_ep_context_t ep_ctx = {0};  in xhci_initialize_ep()  local
941     memset(&ep_ctx, 0, sizeof(struct xhci_ep_context_t));  in xhci_initialize_ep()
945     ep_ctx.tr_dequeue_ptr = virt_2_phys(xhci_hc[id].ports[port_id].ep_info[ep_num].ep_ring_vbase);  in xhci_initialize_ep()
946     xhci_ep_set_dequeue_cycle_state(&ep_ctx, XHCI_TRB_CYCLE_ON);  in xhci_initialize_ep()
950 …d].ports[port_id].ep_info[ep_num].current_ep_ring_cycle = xhci_ep_get_dequeue_cycle_state(&ep_ctx);  in xhci_initialize_ep()
959         ep_ctx.max_packet_size = max_packet;  in xhci_initialize_ep()
960         ep_ctx.linear_stream_array = 0;  in xhci_initialize_ep()
961         ep_ctx.max_primary_streams = 0;  in xhci_initialize_ep()
962         ep_ctx.mult = 0;  in xhci_initialize_ep()
963         ep_ctx.ep_state = XHCI_EP_STATE_DISABLED;  in xhci_initialize_ep()
964         ep_ctx.hid = 0;  in xhci_initialize_ep()
965         ep_ctx.ep_type = XHCI_EP_TYPE_CONTROL;  in xhci_initialize_ep()
966         ep_ctx.average_trb_len = 8; // 所有的control ep的该值均为8  in xhci_initialize_ep()
967         ep_ctx.err_cnt = 3;  in xhci_initialize_ep()
968         ep_ctx.max_burst_size = max_burst;  in xhci_initialize_ep()
969         ep_ctx.interval = ep_interval;  in xhci_initialize_ep()
973         ep_ctx.max_packet_size = max_packet & 0x7ff;  in xhci_initialize_ep()
974         ep_ctx.max_burst_size = max_burst;  in xhci_initialize_ep()
975         ep_ctx.ep_state = XHCI_EP_STATE_DISABLED;  in xhci_initialize_ep()
976         ep_ctx.mult = 0;  in xhci_initialize_ep()
977         ep_ctx.err_cnt = 3;  in xhci_initialize_ep()
978         ep_ctx.max_esti_payload_hi = ((max_packet * (max_burst + 1)) >> 8) & 0xff;  in xhci_initialize_ep()
979         ep_ctx.max_esti_payload_lo = ((max_packet * (max_burst + 1))) & 0xff;  in xhci_initialize_ep()
980         ep_ctx.interval = ep_interval;  in xhci_initialize_ep()
981         ep_ctx.average_trb_len = 8; // todo: It's not sure how much to fill in this value  in xhci_initialize_ep()
983         ep_ctx.ep_type = ((ep_num % 2) ? XHCI_EP_TYPE_INTR_IN : XHCI_EP_TYPE_INTR_OUT);  in xhci_initialize_ep()
991     __write_ep(id, slot_vaddr, ep_num, &ep_ctx);  in xhci_initialize_ep()