[deliverable/linux.git] / drivers / thunderbolt / switch.c

/*
 * Thunderbolt Cactus Ridge driver - switch/port utility functions
 *
 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
 */

#include <linux/delay.h>

#include "tb.h"

/* port utility functions */

static const char *tb_port_type(struct tb_regs_port_header *port)
{
	switch (port->type >> 16) {
	case 0:
		switch ((u8) port->type) {
		case 0:
			return "Inactive";
		case 1:
			return "Port";
		case 2:
			return "NHI";
		default:
			return "unknown";
		}
	case 0x2:
		return "Ethernet";
	case 0x8:
		return "SATA";
	case 0xe:
		return "DP/HDMI";
	case 0x10:
		return "PCIe";
	case 0x20:
		return "USB";
	default:
		return "unknown";
	}
}

static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
{
	tb_info(tb,
		" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
		port->port_number, port->vendor_id, port->device_id,
		port->revision, port->thunderbolt_version, tb_port_type(port),
		port->type);
	tb_info(tb, "  Max hop id (in/out): %d/%d\n",
		port->max_in_hop_id, port->max_out_hop_id);
	tb_info(tb, "  Max counters: %d\n", port->max_counters);
	tb_info(tb, "  NFC Credits: %#x\n", port->nfc_credits);
}

/**
 * tb_port_state() - get connectedness state of a port
 *
 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
 *
 * Return: Returns an enum tb_port_state on success or an error code on failure.
 */
static int tb_port_state(struct tb_port *port)
{
	struct tb_cap_phy phy;
	int res;
	if (port->cap_phy == 0) {
		tb_port_WARN(port, "does not have a PHY\n");
		return -EINVAL;
	}
	res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
	if (res)
		return res;
	return phy.state;
}

/**
 * tb_wait_for_port() - wait for a port to become ready
 *
 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
 * wait_if_unplugged is set then we also wait if the port is in state
 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
 * switch resume). Otherwise we only wait if a device is registered but the link
 * has not yet been established.
 *
 * Return: Returns an error code on failure. Returns 0 if the port is not
 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
 * if the port is connected and in state TB_PORT_UP.
 */
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
{
	int retries = 10;
	int state;
	if (!port->cap_phy) {
		tb_port_WARN(port, "does not have PHY\n");
		return -EINVAL;
	}
	if (tb_is_upstream_port(port)) {
		tb_port_WARN(port, "is the upstream port\n");
		return -EINVAL;
	}

	while (retries--) {
		state = tb_port_state(port);
		if (state < 0)
			return state;
		if (state == TB_PORT_DISABLED) {
			tb_port_info(port, "is disabled (state: 0)\n");
			return 0;
		}
		if (state == TB_PORT_UNPLUGGED) {
			if (wait_if_unplugged) {
				/* used during resume */
				tb_port_info(port,
					     "is unplugged (state: 7), retrying...\n");
				msleep(100);
				continue;
			}
			tb_port_info(port, "is unplugged (state: 7)\n");
			return 0;
		}
		if (state == TB_PORT_UP) {
			tb_port_info(port,
				     "is connected, link is up (state: 2)\n");
			return 1;
		}

		/*
		 * After plug-in the state is TB_PORT_CONNECTING. Give it some
		 * time.
		 */
		tb_port_info(port,
			     "is connected, link is not up (state: %d), retrying...\n",
			     state);
		msleep(100);
	}
	tb_port_warn(port,
		     "failed to reach state TB_PORT_UP. Ignoring port...\n");
	return 0;
}

/**
 * tb_init_port() - initialize a port
 *
 * This is a helper method for tb_switch_alloc. Does not check or initialize
 * any downstream switches.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
static int tb_init_port(struct tb_switch *sw, u8 port_nr)
{
	int res;
	int cap;
	struct tb_port *port = &sw->ports[port_nr];
	port->sw = sw;
	port->port = port_nr;
	port->remote = NULL;
	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
	if (res)
		return res;

	/* Port 0 is the switch itself and has no PHY. */
	if (port->config.type == TB_TYPE_PORT && port_nr != 0) {
		cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY);

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

	tb_dump_port(sw->tb, &port->config);

	/* TODO: Read dual link port, DP port and more from EEPROM. */
	return 0;

}

/* switch utility functions */

static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
{
	tb_info(tb,
		" Switch: %x:%x (Revision: %d, TB Version: %d)\n",
		sw->vendor_id, sw->device_id, sw->revision,
		sw->thunderbolt_version);
	tb_info(tb, "  Max Port Number: %d\n", sw->max_port_number);
	tb_info(tb, "  Config:\n");
	tb_info(tb,
		"   Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
		sw->upstream_port_number, sw->depth,
		(((u64) sw->route_hi) << 32) | sw->route_lo,
		sw->enabled, sw->plug_events_delay);
	tb_info(tb,
		"   unknown1: %#x unknown4: %#x\n",
		sw->__unknown1, sw->__unknown4);
}

struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
{
	u8 next_port = route; /*
			       * Routes use a stride of 8 bits,
			       * eventhough a port index has 6 bits at most.
			       * */
	if (route == 0)
		return sw;
	if (next_port > sw->config.max_port_number)
		return 0;
	if (tb_is_upstream_port(&sw->ports[next_port]))
		return 0;
	if (!sw->ports[next_port].remote)
		return 0;
	return get_switch_at_route(sw->ports[next_port].remote->sw,
				   route >> TB_ROUTE_SHIFT);
}

/**
 * tb_plug_events_active() - enable/disable plug events on a switch
 *
 * Also configures a sane plug_events_delay of 255ms.
 *
 * Return: Returns 0 on success or an error code on failure.
 */
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
	u32 data;
	int res;

	sw->config.plug_events_delay = 0xff;
	res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
	if (res)
		return res;

	res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
	if (res)
		return res;

	if (active) {
		data = data & 0xFFFFFF83;
		switch (sw->config.device_id) {
		case 0x1513:
		case 0x151a:
		case 0x1549:
			break;
		default:
			data |= 4;
		}
	} else {
		data = data | 0x7c;
	}
	return tb_sw_write(sw, &data, TB_CFG_SWITCH,
			   sw->cap_plug_events + 1, 1);
}


/**
 * tb_switch_free() - free a tb_switch and all downstream switches
 */
void tb_switch_free(struct tb_switch *sw)
{
	int i;
	/* port 0 is the switch itself and never has a remote */
	for (i = 1; i <= sw->config.max_port_number; i++) {
		if (tb_is_upstream_port(&sw->ports[i]))
			continue;
		if (sw->ports[i].remote)
			tb_switch_free(sw->ports[i].remote->sw);
		sw->ports[i].remote = NULL;
	}

	if (!sw->is_unplugged)
		tb_plug_events_active(sw, false);

	kfree(sw->ports);
	kfree(sw);
}

/**
 * tb_switch_alloc() - allocate and initialize a switch
 *
 * Return: Returns a NULL on failure.
 */
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
{
	int i;
	int cap;
	struct tb_switch *sw;
	int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
	if (upstream_port < 0)
		return NULL;

	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
	if (!sw)
		return NULL;

	sw->tb = tb;
	if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5))
		goto err;
	tb_info(tb,
		"initializing Switch at %#llx (depth: %d, up port: %d)\n",
		route, tb_route_length(route), upstream_port);
	tb_info(tb, "old switch config:\n");
	tb_dump_switch(tb, &sw->config);

	/* configure switch */
	sw->config.upstream_port_number = upstream_port;
	sw->config.depth = tb_route_length(route);
	sw->config.route_lo = route;
	sw->config.route_hi = route >> 32;
	sw->config.enabled = 1;
	/* from here on we may use the tb_sw_* functions & macros */

	if (sw->config.vendor_id != 0x8086)
		tb_sw_warn(sw, "unknown switch vendor id %#x\n",
			   sw->config.vendor_id);

	if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549)
		tb_sw_warn(sw, "unsupported switch device id %#x\n",
			   sw->config.device_id);

	/* upload configuration */
	if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
		goto err;

	/* initialize ports */
	sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
	GFP_KERNEL);
	if (!sw->ports)
		goto err;

	for (i = 0; i <= sw->config.max_port_number; i++) {
		if (tb_init_port(sw, i))
			goto err;
		/* TODO: check if port is disabled (EEPROM) */
	}

	/* TODO: I2C, IECS, EEPROM, link controller */

	cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
	if (cap < 0) {
		tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
		goto err;
	}
	sw->cap_plug_events = cap;

	if (tb_plug_events_active(sw, true))
		goto err;

	return sw;
err:
	kfree(sw->ports);
	kfree(sw);
	return NULL;
}

/**
 * tb_sw_set_unpplugged() - set is_unplugged on switch and downstream switches
 */
void tb_sw_set_unpplugged(struct tb_switch *sw)
{
	int i;
	if (sw == sw->tb->root_switch) {
		tb_sw_WARN(sw, "cannot unplug root switch\n");
		return;
	}
	if (sw->is_unplugged) {
		tb_sw_WARN(sw, "is_unplugged already set\n");
		return;
	}
	sw->is_unplugged = true;
	for (i = 0; i <= sw->config.max_port_number; i++) {
		if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
			tb_sw_set_unpplugged(sw->ports[i].remote->sw);
	}
}
Commit	Line	Data
a25c8b2f AN	1	/*
	2	* Thunderbolt Cactus Ridge driver - switch/port utility functions
	3	*
	4	* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
	5	*/
	6
	7	#include <linux/delay.h>
	8
	9	#include "tb.h"
	10
	11	/* port utility functions */
	12
	13	static const char tb_port_type(struct tb_regs_port_header port)
	14	{
	15	switch (port->type >> 16) {
	16	case 0:
	17	switch ((u8) port->type) {
	18	case 0:
	19	return "Inactive";
	20	case 1:
	21	return "Port";
	22	case 2:
	23	return "NHI";
	24	default:
	25	return "unknown";
	26	}
	27	case 0x2:
	28	return "Ethernet";
	29	case 0x8:
	30	return "SATA";
	31	case 0xe:
	32	return "DP/HDMI";
	33	case 0x10:
	34	return "PCIe";
	35	case 0x20:
	36	return "USB";
	37	default:
	38	return "unknown";
	39	}
	40	}
	41
	42	static void tb_dump_port(struct tb tb, struct tb_regs_port_header port)
	43	{
	44	tb_info(tb,
	45	" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
	46	port->port_number, port->vendor_id, port->device_id,
	47	port->revision, port->thunderbolt_version, tb_port_type(port),
	48	port->type);
	49	tb_info(tb, " Max hop id (in/out): %d/%d\n",
	50	port->max_in_hop_id, port->max_out_hop_id);
	51	tb_info(tb, " Max counters: %d\n", port->max_counters);
	52	tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
	53	}
	54
9da672a4 AN	55	/**
	56	* tb_port_state() - get connectedness state of a port
	57	*
	58	* The port must have a TB_CAP_PHY (i.e. it should be a real port).
	59	*
	60	* Return: Returns an enum tb_port_state on success or an error code on failure.
	61	*/
	62	static int tb_port_state(struct tb_port *port)
	63	{
	64	struct tb_cap_phy phy;
	65	int res;
	66	if (port->cap_phy == 0) {
	67	tb_port_WARN(port, "does not have a PHY\n");
	68	return -EINVAL;
	69	}
	70	res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
	71	if (res)
	72	return res;
	73	return phy.state;
	74	}
	75
	76	/**
	77	* tb_wait_for_port() - wait for a port to become ready
	78	*
	79	* Wait up to 1 second for a port to reach state TB_PORT_UP. If
	80	* wait_if_unplugged is set then we also wait if the port is in state
	81	* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
	82	* switch resume). Otherwise we only wait if a device is registered but the link
	83	* has not yet been established.
	84	*
	85	* Return: Returns an error code on failure. Returns 0 if the port is not
	86	* connected or failed to reach state TB_PORT_UP within one second. Returns 1
	87	* if the port is connected and in state TB_PORT_UP.
	88	*/
	89	int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
	90	{
	91	int retries = 10;
	92	int state;
	93	if (!port->cap_phy) {
	94	tb_port_WARN(port, "does not have PHY\n");
	95	return -EINVAL;
	96	}
	97	if (tb_is_upstream_port(port)) {
	98	tb_port_WARN(port, "is the upstream port\n");
	99	return -EINVAL;
	100	}
	101
	102	while (retries--) {
	103	state = tb_port_state(port);
	104	if (state < 0)
	105	return state;
	106	if (state == TB_PORT_DISABLED) {
	107	tb_port_info(port, "is disabled (state: 0)\n");
	108	return 0;
	109	}
	110	if (state == TB_PORT_UNPLUGGED) {
	111	if (wait_if_unplugged) {
	112	/* used during resume */
	113	tb_port_info(port,
	114	"is unplugged (state: 7), retrying...\n");
	115	msleep(100);
	116	continue;
	117	}
	118	tb_port_info(port, "is unplugged (state: 7)\n");
119	return 0;
120	}
121	if (state == TB_PORT_UP) {
122	tb_port_info(port,
123	"is connected, link is up (state: 2)\n");
124	return 1;
125	}
126
127	/*
128	* After plug-in the state is TB_PORT_CONNECTING. Give it some
129	* time.
130	*/
131	tb_port_info(port,
132	"is connected, link is not up (state: %d), retrying...\n",
133	state);
134	msleep(100);
135	}
136	tb_port_warn(port,
137	"failed to reach state TB_PORT_UP. Ignoring port...\n");
138	return 0;
139	}
140
a25c8b2f AN	141	/**
	142	* tb_init_port() - initialize a port
	143	*
	144	* This is a helper method for tb_switch_alloc. Does not check or initialize
	145	* any downstream switches.
	146	*
	147	* Return: Returns 0 on success or an error code on failure.
	148	*/
	149	static int tb_init_port(struct tb_switch *sw, u8 port_nr)
	150	{
	151	int res;
9da672a4	152	int cap;
a25c8b2f AN	153	struct tb_port *port = &sw->ports[port_nr];
	154	port->sw = sw;
	155	port->port = port_nr;
	156	port->remote = NULL;
	157	res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
	158	if (res)
	159	return res;
	160
9da672a4 AN	161	/* Port 0 is the switch itself and has no PHY. */
	162	if (port->config.type == TB_TYPE_PORT && port_nr != 0) {
	163	cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY);
	164
	165	if (cap > 0)
	166	port->cap_phy = cap;
	167	else
	168	tb_port_WARN(port, "non switch port without a PHY\n");
	169	}
	170
a25c8b2f AN	171	tb_dump_port(sw->tb, &port->config);
	172
	173	/* TODO: Read dual link port, DP port and more from EEPROM. */
	174	return 0;
	175
	176	}
	177
	178	/* switch utility functions */
	179
	180	static void tb_dump_switch(struct tb tb, struct tb_regs_switch_header sw)
	181	{
	182	tb_info(tb,
	183	" Switch: %x:%x (Revision: %d, TB Version: %d)\n",
	184	sw->vendor_id, sw->device_id, sw->revision,
	185	sw->thunderbolt_version);
	186	tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
	187	tb_info(tb, " Config:\n");
	188	tb_info(tb,
	189	" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
	190	sw->upstream_port_number, sw->depth,
	191	(((u64) sw->route_hi) << 32) \| sw->route_lo,
	192	sw->enabled, sw->plug_events_delay);
	193	tb_info(tb,
	194	" unknown1: %#x unknown4: %#x\n",
	195	sw->__unknown1, sw->__unknown4);
	196	}
	197
053596d9 AN	198	struct tb_switch get_switch_at_route(struct tb_switch sw, u64 route)
	199	{
	200	u8 next_port = route; /*
	201	* Routes use a stride of 8 bits,
	202	* eventhough a port index has 6 bits at most.
	203	* */
	204	if (route == 0)
	205	return sw;
	206	if (next_port > sw->config.max_port_number)
	207	return 0;
	208	if (tb_is_upstream_port(&sw->ports[next_port]))
	209	return 0;
	210	if (!sw->ports[next_port].remote)
	211	return 0;
	212	return get_switch_at_route(sw->ports[next_port].remote->sw,
	213	route >> TB_ROUTE_SHIFT);
	214	}
	215
ca389f71 AN	216	/**
	217	* tb_plug_events_active() - enable/disable plug events on a switch
	218	*
	219	* Also configures a sane plug_events_delay of 255ms.
	220	*
	221	* Return: Returns 0 on success or an error code on failure.
	222	*/
	223	static int tb_plug_events_active(struct tb_switch *sw, bool active)
	224	{
	225	u32 data;
	226	int res;
	227
	228	sw->config.plug_events_delay = 0xff;
	229	res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
	230	if (res)
	231	return res;
	232
	233	res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
	234	if (res)
	235	return res;
	236
	237	if (active) {
	238	data = data & 0xFFFFFF83;
	239	switch (sw->config.device_id) {
	240	case 0x1513:
	241	case 0x151a:
	242	case 0x1549:
	243	break;
	244	default:
	245	data \|= 4;
	246	}
	247	} else {
	248	data = data \| 0x7c;
	249	}
	250	return tb_sw_write(sw, &data, TB_CFG_SWITCH,
	251	sw->cap_plug_events + 1, 1);
	252	}
	253
	254
a25c8b2f AN	255	/**
	256	* tb_switch_free() - free a tb_switch and all downstream switches
	257	*/
	258	void tb_switch_free(struct tb_switch *sw)
	259	{
	260	int i;
	261	/* port 0 is the switch itself and never has a remote */
	262	for (i = 1; i <= sw->config.max_port_number; i++) {
	263	if (tb_is_upstream_port(&sw->ports[i]))
	264	continue;
	265	if (sw->ports[i].remote)
	266	tb_switch_free(sw->ports[i].remote->sw);
	267	sw->ports[i].remote = NULL;
	268	}
	269
053596d9 AN	270	if (!sw->is_unplugged)
053596d9 AN	271	tb_plug_events_active(sw, false);
ca389f71	272
a25c8b2f AN	273	kfree(sw->ports);
	274	kfree(sw);
	275	}
	276
	277	/**
	278	* tb_switch_alloc() - allocate and initialize a switch
	279	*
	280	* Return: Returns a NULL on failure.
	281	*/
	282	struct tb_switch tb_switch_alloc(struct tb tb, u64 route)
	283	{
	284	int i;
ca389f71	285	int cap;
a25c8b2f AN	286	struct tb_switch *sw;
	287	int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
	288	if (upstream_port < 0)
	289	return NULL;
	290
	291	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
	292	if (!sw)
	293	return NULL;
	294
	295	sw->tb = tb;
	296	if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5))
	297	goto err;
	298	tb_info(tb,
	299	"initializing Switch at %#llx (depth: %d, up port: %d)\n",
	300	route, tb_route_length(route), upstream_port);
	301	tb_info(tb, "old switch config:\n");
	302	tb_dump_switch(tb, &sw->config);
	303
	304	/* configure switch */
	305	sw->config.upstream_port_number = upstream_port;
	306	sw->config.depth = tb_route_length(route);
	307	sw->config.route_lo = route;
	308	sw->config.route_hi = route >> 32;
	309	sw->config.enabled = 1;
	310	/* from here on we may use the tb_sw_* functions & macros */
	311
	312	if (sw->config.vendor_id != 0x8086)
	313	tb_sw_warn(sw, "unknown switch vendor id %#x\n",
	314	sw->config.vendor_id);
	315
	316	if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549)
	317	tb_sw_warn(sw, "unsupported switch device id %#x\n",
	318	sw->config.device_id);
	319
	320	/* upload configuration */
	321	if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
	322	goto err;
	323
	324	/* initialize ports */
	325	sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
	326	GFP_KERNEL);
	327	if (!sw->ports)
	328	goto err;
	329
	330	for (i = 0; i <= sw->config.max_port_number; i++) {
	331	if (tb_init_port(sw, i))
	332	goto err;
	333	/* TODO: check if port is disabled (EEPROM) */
	334	}
	335
	336	/* TODO: I2C, IECS, EEPROM, link controller */
	337
ca389f71 AN	338	cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
	339	if (cap < 0) {
	340	tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
	341	goto err;
	342	}
	343	sw->cap_plug_events = cap;
	344
	345	if (tb_plug_events_active(sw, true))
	346	goto err;
	347
a25c8b2f AN	348	return sw;
	349	err:
	350	kfree(sw->ports);
	351	kfree(sw);
	352	return NULL;
	353	}
	354
053596d9 AN	355	/**
	356	* tb_sw_set_unpplugged() - set is_unplugged on switch and downstream switches
	357	*/
	358	void tb_sw_set_unpplugged(struct tb_switch *sw)
	359	{
	360	int i;
	361	if (sw == sw->tb->root_switch) {
	362	tb_sw_WARN(sw, "cannot unplug root switch\n");
	363	return;
	364	}
	365	if (sw->is_unplugged) {
	366	tb_sw_WARN(sw, "is_unplugged already set\n");
	367	return;
	368	}
	369	sw->is_unplugged = true;
	370	for (i = 0; i <= sw->config.max_port_number; i++) {
	371	if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
	372	tb_sw_set_unpplugged(sw->ports[i].remote->sw);
	373	}
	374	}
	375