static int tb_init_port()

in switch.c [730:791]

• 44 lines of code
• 11 McCabe index (conditional complexity)

static int tb_init_port(struct tb_port *port)
{
	int res;
	int cap;

	INIT_LIST_HEAD(&port->list);

	/* Control adapter does not have configuration space */
	if (!port->port)
		return 0;

	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
	if (res) {
		if (res == -ENODEV) {
			tb_dbg(port->sw->tb, " Port %d: not implemented\n",
			       port->port);
			port->disabled = true;
			return 0;
		}
		return res;
	}

	/* Port 0 is the switch itself and has no PHY. */
	if (port->config.type == TB_TYPE_PORT) {
		cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);

		if (cap > 0)
			port->cap_phy = cap;
		else
			tb_port_WARN(port, "non switch port without a PHY\n");

		cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
		if (cap > 0)
			port->cap_usb4 = cap;

		/*
		 * USB4 ports the buffers allocated for the control path
		 * can be read from the path config space. Legacy
		 * devices we use hard-coded value.
		 */
		if (tb_switch_is_usb4(port->sw)) {
			struct tb_regs_hop hop;

			if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
				port->ctl_credits = hop.initial_credits;
		}
		if (!port->ctl_credits)
			port->ctl_credits = 2;

	} else {
		cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
		if (cap > 0)
			port->cap_adap = cap;
	}

	port->total_credits =
		(port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
		ADP_CS_4_TOTAL_BUFFERS_SHIFT;

	tb_dump_port(port->sw->tb, port);
	return 0;
}