1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * xHCI host controller driver
   4 *
   5 * Copyright (C) 2008 Intel Corp.
   6 *
   7 * Author: Sarah Sharp
   8 * Some code borrowed from the Linux EHCI driver.
   9 */
  10
  11
  12#include <linux/slab.h>
  13#include <asm/unaligned.h>
  14#include <linux/bitfield.h>
  15
  16#include "xhci.h"
  17#include "xhci-trace.h"
  18
  19#define	PORT_WAKE_BITS	(PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
  20#define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
  21			 PORT_RC | PORT_PLC | PORT_PE)
  22
  23/* Default sublink speed attribute of each lane */
  24static u32 ssp_cap_default_ssa[] = {
  25	0x00050034, /* USB 3.0 SS Gen1x1 id:4 symmetric rx 5Gbps */
  26	0x000500b4, /* USB 3.0 SS Gen1x1 id:4 symmetric tx 5Gbps */
  27	0x000a4035, /* USB 3.1 SSP Gen2x1 id:5 symmetric rx 10Gbps */
  28	0x000a40b5, /* USB 3.1 SSP Gen2x1 id:5 symmetric tx 10Gbps */
  29	0x00054036, /* USB 3.2 SSP Gen1x2 id:6 symmetric rx 5Gbps */
  30	0x000540b6, /* USB 3.2 SSP Gen1x2 id:6 symmetric tx 5Gbps */
  31	0x000a4037, /* USB 3.2 SSP Gen2x2 id:7 symmetric rx 10Gbps */
  32	0x000a40b7, /* USB 3.2 SSP Gen2x2 id:7 symmetric tx 10Gbps */
  33};
  34
  35static int xhci_create_usb3x_bos_desc(struct xhci_hcd *xhci, char *buf,
  36				      u16 wLength)
  37{
  38	struct usb_bos_descriptor	*bos;
  39	struct usb_ss_cap_descriptor	*ss_cap;
  40	struct usb_ssp_cap_descriptor	*ssp_cap;
  41	struct xhci_port_cap		*port_cap = NULL;
  42	u16				bcdUSB;
  43	u32				reg;
  44	u32				min_rate = 0;
  45	u8				min_ssid;
  46	u8				ssac;
  47	u8				ssic;
  48	int				offset;
  49	int				i;
  50
  51	/* BOS descriptor */
  52	bos = (struct usb_bos_descriptor *)buf;
  53	bos->bLength = USB_DT_BOS_SIZE;
  54	bos->bDescriptorType = USB_DT_BOS;
  55	bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE +
  56					USB_DT_USB_SS_CAP_SIZE);
  57	bos->bNumDeviceCaps = 1;
  58
  59	/* Create the descriptor for port with the highest revision */
  60	for (i = 0; i < xhci->num_port_caps; i++) {
  61		u8 major = xhci->port_caps[i].maj_rev;
  62		u8 minor = xhci->port_caps[i].min_rev;
  63		u16 rev = (major << 8) | minor;
  64
  65		if (i == 0 || bcdUSB < rev) {
  66			bcdUSB = rev;
  67			port_cap = &xhci->port_caps[i];
  68		}
  69	}
  70
  71	if (bcdUSB >= 0x0310) {
  72		if (port_cap->psi_count) {
  73			u8 num_sym_ssa = 0;
  74
  75			for (i = 0; i < port_cap->psi_count; i++) {
  76				if ((port_cap->psi[i] & PLT_MASK) == PLT_SYM)
  77					num_sym_ssa++;
  78			}
  79
  80			ssac = port_cap->psi_count + num_sym_ssa - 1;
  81			ssic = port_cap->psi_uid_count - 1;
  82		} else {
  83			if (bcdUSB >= 0x0320)
  84				ssac = 7;
  85			else
  86				ssac = 3;
  87
  88			ssic = (ssac + 1) / 2 - 1;
  89		}
  90
  91		bos->bNumDeviceCaps++;
  92		bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE +
  93						USB_DT_USB_SS_CAP_SIZE +
  94						USB_DT_USB_SSP_CAP_SIZE(ssac));
  95	}
  96
  97	if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
  98		return wLength;
  99
 100	/* SuperSpeed USB Device Capability */
 101	ss_cap = (struct usb_ss_cap_descriptor *)&buf[USB_DT_BOS_SIZE];
 102	ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
 103	ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
 104	ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
 105	ss_cap->bmAttributes = 0; /* set later */
 106	ss_cap->wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION);
 107	ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
 108	ss_cap->bU1devExitLat = 0; /* set later */
 109	ss_cap->bU2DevExitLat = 0; /* set later */
 110
 111	reg = readl(&xhci->cap_regs->hcc_params);
 112	if (HCC_LTC(reg))
 113		ss_cap->bmAttributes |= USB_LTM_SUPPORT;
 114
 115	if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
 116		reg = readl(&xhci->cap_regs->hcs_params3);
 117		ss_cap->bU1devExitLat = HCS_U1_LATENCY(reg);
 118		ss_cap->bU2DevExitLat = cpu_to_le16(HCS_U2_LATENCY(reg));
 119	}
 120
 121	if (wLength < le16_to_cpu(bos->wTotalLength))
 122		return wLength;
 123
 124	if (bcdUSB < 0x0310)
 125		return le16_to_cpu(bos->wTotalLength);
 126
 127	ssp_cap = (struct usb_ssp_cap_descriptor *)&buf[USB_DT_BOS_SIZE +
 128		USB_DT_USB_SS_CAP_SIZE];
 129	ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(ssac);
 130	ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
 131	ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
 132	ssp_cap->bReserved = 0;
 133	ssp_cap->wReserved = 0;
 134	ssp_cap->bmAttributes =
 135		cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_ATTRIBS, ssac) |
 136			    FIELD_PREP(USB_SSP_SUBLINK_SPEED_IDS, ssic));
 137
 138	if (!port_cap->psi_count) {
 139		for (i = 0; i < ssac + 1; i++)
 140			ssp_cap->bmSublinkSpeedAttr[i] =
 141				cpu_to_le32(ssp_cap_default_ssa[i]);
 142
 143		min_ssid = 4;
 144		goto out;
 145	}
 146
 147	offset = 0;
 148	for (i = 0; i < port_cap->psi_count; i++) {
 149		u32 psi;
 150		u32 attr;
 151		u8 ssid;
 152		u8 lp;
 153		u8 lse;
 154		u8 psie;
 155		u16 lane_mantissa;
 156		u16 psim;
 157		u16 plt;
 158
 159		psi = port_cap->psi[i];
 160		ssid = XHCI_EXT_PORT_PSIV(psi);
 161		lp = XHCI_EXT_PORT_LP(psi);
 162		psie = XHCI_EXT_PORT_PSIE(psi);
 163		psim = XHCI_EXT_PORT_PSIM(psi);
 164		plt = psi & PLT_MASK;
 165
 166		lse = psie;
 167		lane_mantissa = psim;
 168
 169		/* Shift to Gbps and set SSP Link Protocol if 10Gpbs */
 170		for (; psie < USB_SSP_SUBLINK_SPEED_LSE_GBPS; psie++)
 171			psim /= 1000;
 172
 173		if (!min_rate || psim < min_rate) {
 174			min_ssid = ssid;
 175			min_rate = psim;
 176		}
 177
 178		/* Some host controllers don't set the link protocol for SSP */
 179		if (psim >= 10)
 180			lp = USB_SSP_SUBLINK_SPEED_LP_SSP;
 181
 182		/*
 183		 * PSIM and PSIE represent the total speed of PSI. The BOS
 184		 * descriptor SSP sublink speed attribute lane mantissa
 185		 * describes the lane speed. E.g. PSIM and PSIE for gen2x2
 186		 * is 20Gbps, but the BOS descriptor lane speed mantissa is
 187		 * 10Gbps. Check and modify the mantissa value to match the
 188		 * lane speed.
 189		 */
 190		if (bcdUSB == 0x0320 && plt == PLT_SYM) {
 191			/*
 192			 * The PSI dword for gen1x2 and gen2x1 share the same
 193			 * values. But the lane speed for gen1x2 is 5Gbps while
 194			 * gen2x1 is 10Gbps. If the previous PSI dword SSID is
 195			 * 5 and the PSIE and PSIM match with SSID 6, let's
 196			 * assume that the controller follows the default speed
 197			 * id with SSID 6 for gen1x2.
 198			 */
 199			if (ssid == 6 && psie == 3 && psim == 10 && i) {
 200				u32 prev = port_cap->psi[i - 1];
 201
 202				if ((prev & PLT_MASK) == PLT_SYM &&
 203				    XHCI_EXT_PORT_PSIV(prev) == 5 &&
 204				    XHCI_EXT_PORT_PSIE(prev) == 3 &&
 205				    XHCI_EXT_PORT_PSIM(prev) == 10) {
 206					lse = USB_SSP_SUBLINK_SPEED_LSE_GBPS;
 207					lane_mantissa = 5;
 208				}
 209			}
 210
 211			if (psie == 3 && psim > 10) {
 212				lse = USB_SSP_SUBLINK_SPEED_LSE_GBPS;
 213				lane_mantissa = 10;
 214			}
 215		}
 216
 217		attr = (FIELD_PREP(USB_SSP_SUBLINK_SPEED_SSID, ssid) |
 218			FIELD_PREP(USB_SSP_SUBLINK_SPEED_LP, lp) |
 219			FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSE, lse) |
 220			FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSM, lane_mantissa));
 221
 222		switch (plt) {
 223		case PLT_SYM:
 224			attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 225					   USB_SSP_SUBLINK_SPEED_ST_SYM_RX);
 226			ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 227
 228			attr &= ~USB_SSP_SUBLINK_SPEED_ST;
 229			attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 230					   USB_SSP_SUBLINK_SPEED_ST_SYM_TX);
 231			ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 232			break;
 233		case PLT_ASYM_RX:
 234			attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 235					   USB_SSP_SUBLINK_SPEED_ST_ASYM_RX);
 236			ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 237			break;
 238		case PLT_ASYM_TX:
 239			attr |= FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST,
 240					   USB_SSP_SUBLINK_SPEED_ST_ASYM_TX);
 241			ssp_cap->bmSublinkSpeedAttr[offset++] = cpu_to_le32(attr);
 242			break;
 243		}
 244	}
 245out:
 246	ssp_cap->wFunctionalitySupport =
 247		cpu_to_le16(FIELD_PREP(USB_SSP_MIN_SUBLINK_SPEED_ATTRIBUTE_ID,
 248				       min_ssid) |
 249			    FIELD_PREP(USB_SSP_MIN_RX_LANE_COUNT, 1) |
 250			    FIELD_PREP(USB_SSP_MIN_TX_LANE_COUNT, 1));
 251
 252	return le16_to_cpu(bos->wTotalLength);
 253}
 254
 255static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 256		struct usb_hub_descriptor *desc, int ports)
 257{
 258	u16 temp;
 259
 
 260	desc->bHubContrCurrent = 0;
 261
 262	desc->bNbrPorts = ports;
 263	temp = 0;
 264	/* Bits 1:0 - support per-port power switching, or power always on */
 265	if (HCC_PPC(xhci->hcc_params))
 266		temp |= HUB_CHAR_INDV_PORT_LPSM;
 267	else
 268		temp |= HUB_CHAR_NO_LPSM;
 269	/* Bit  2 - root hubs are not part of a compound device */
 270	/* Bits 4:3 - individual port over current protection */
 271	temp |= HUB_CHAR_INDV_PORT_OCPM;
 272	/* Bits 6:5 - no TTs in root ports */
 273	/* Bit  7 - no port indicators */
 274	desc->wHubCharacteristics = cpu_to_le16(temp);
 275}
 276
 277/* Fill in the USB 2.0 roothub descriptor */
 278static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 279		struct usb_hub_descriptor *desc)
 280{
 281	int ports;
 282	u16 temp;
 283	__u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
 284	u32 portsc;
 285	unsigned int i;
 286	struct xhci_hub *rhub;
 287
 288	rhub = &xhci->usb2_rhub;
 289	ports = rhub->num_ports;
 290	xhci_common_hub_descriptor(xhci, desc, ports);
 291	desc->bDescriptorType = USB_DT_HUB;
 292	temp = 1 + (ports / 8);
 293	desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
 294	desc->bPwrOn2PwrGood = 10;	/* xhci section 5.4.8 says 20ms */
 295
 296	/* The Device Removable bits are reported on a byte granularity.
 297	 * If the port doesn't exist within that byte, the bit is set to 0.
 298	 */
 299	memset(port_removable, 0, sizeof(port_removable));
 300	for (i = 0; i < ports; i++) {
 301		portsc = readl(rhub->ports[i]->addr);
 302		/* If a device is removable, PORTSC reports a 0, same as in the
 303		 * hub descriptor DeviceRemovable bits.
 304		 */
 305		if (portsc & PORT_DEV_REMOVE)
 306			/* This math is hairy because bit 0 of DeviceRemovable
 307			 * is reserved, and bit 1 is for port 1, etc.
 308			 */
 309			port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
 310	}
 311
 312	/* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
 313	 * ports on it.  The USB 2.0 specification says that there are two
 314	 * variable length fields at the end of the hub descriptor:
 315	 * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
 316	 * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
 317	 * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
 318	 * 0xFF, so we initialize the both arrays (DeviceRemovable and
 319	 * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
 320	 * set of ports that actually exist.
 321	 */
 322	memset(desc->u.hs.DeviceRemovable, 0xff,
 323			sizeof(desc->u.hs.DeviceRemovable));
 324	memset(desc->u.hs.PortPwrCtrlMask, 0xff,
 325			sizeof(desc->u.hs.PortPwrCtrlMask));
 326
 327	for (i = 0; i < (ports + 1 + 7) / 8; i++)
 328		memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
 329				sizeof(__u8));
 330}
 331
 332/* Fill in the USB 3.0 roothub descriptor */
 333static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 334		struct usb_hub_descriptor *desc)
 335{
 336	int ports;
 337	u16 port_removable;
 338	u32 portsc;
 339	unsigned int i;
 340	struct xhci_hub *rhub;
 341
 342	rhub = &xhci->usb3_rhub;
 343	ports = rhub->num_ports;
 344	xhci_common_hub_descriptor(xhci, desc, ports);
 345	desc->bDescriptorType = USB_DT_SS_HUB;
 346	desc->bDescLength = USB_DT_SS_HUB_SIZE;
 347	desc->bPwrOn2PwrGood = 50;	/* usb 3.1 may fail if less than 100ms */
 348
 349	/* header decode latency should be zero for roothubs,
 350	 * see section 4.23.5.2.
 351	 */
 352	desc->u.ss.bHubHdrDecLat = 0;
 353	desc->u.ss.wHubDelay = 0;
 354
 355	port_removable = 0;
 356	/* bit 0 is reserved, bit 1 is for port 1, etc. */
 357	for (i = 0; i < ports; i++) {
 358		portsc = readl(rhub->ports[i]->addr);
 359		if (portsc & PORT_DEV_REMOVE)
 360			port_removable |= 1 << (i + 1);
 361	}
 362
 363	desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
 364}
 365
 366static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 367		struct usb_hub_descriptor *desc)
 368{
 369
 370	if (hcd->speed >= HCD_USB3)
 371		xhci_usb3_hub_descriptor(hcd, xhci, desc);
 372	else
 373		xhci_usb2_hub_descriptor(hcd, xhci, desc);
 374
 375}
 376
 377static unsigned int xhci_port_speed(unsigned int port_status)
 378{
 379	if (DEV_LOWSPEED(port_status))
 380		return USB_PORT_STAT_LOW_SPEED;
 381	if (DEV_HIGHSPEED(port_status))
 382		return USB_PORT_STAT_HIGH_SPEED;
 383	/*
 384	 * FIXME: Yes, we should check for full speed, but the core uses that as
 385	 * a default in portspeed() in usb/core/hub.c (which is the only place
 386	 * USB_PORT_STAT_*_SPEED is used).
 387	 */
 388	return 0;
 389}
 390
 391/*
 392 * These bits are Read Only (RO) and should be saved and written to the
 393 * registers: 0, 3, 10:13, 30
 394 * connect status, over-current status, port speed, and device removable.
 395 * connect status and port speed are also sticky - meaning they're in
 396 * the AUX well and they aren't changed by a hot, warm, or cold reset.
 397 */
 398#define	XHCI_PORT_RO	((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
 399/*
 400 * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
 401 * bits 5:8, 9, 14:15, 25:27
 402 * link state, port power, port indicator state, "wake on" enable state
 403 */
 404#define XHCI_PORT_RWS	((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
 405/*
 406 * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
 407 * bit 4 (port reset)
 408 */
 409#define	XHCI_PORT_RW1S	((1<<4))
 410/*
 411 * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
 412 * bits 1, 17, 18, 19, 20, 21, 22, 23
 413 * port enable/disable, and
 414 * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
 415 * over-current, reset, link state, and L1 change
 416 */
 417#define XHCI_PORT_RW1CS	((1<<1) | (0x7f<<17))
 418/*
 419 * Bit 16 is RW, and writing a '1' to it causes the link state control to be
 420 * latched in
 421 */
 422#define	XHCI_PORT_RW	((1<<16))
 423/*
 424 * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
 425 * bits 2, 24, 28:31
 426 */
 427#define	XHCI_PORT_RZ	((1<<2) | (1<<24) | (0xf<<28))
 428
 429/**
 430 * xhci_port_state_to_neutral() - Clean up read portsc value back into writeable
 431 * @state: u32 port value read from portsc register to be cleanup up
 432 *
 433 * Given a port state, this function returns a value that would result in the
 434 * port being in the same state, if the value was written to the port status
 435 * control register.
 436 * Save Read Only (RO) bits and save read/write bits where
 437 * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 438 * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 439 *
 440 * Return: u32 value that can be written back to portsc register without
 441 * changing port state.
 442 */
 443
 444u32 xhci_port_state_to_neutral(u32 state)
 445{
 446	/* Save read-only status and port state */
 447	return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 448}
 449EXPORT_SYMBOL_GPL(xhci_port_state_to_neutral);
 450
 451/**
 452 * xhci_find_slot_id_by_port() - Find slot id of a usb device on a roothub port
 453 * @hcd: pointer to hcd of the roothub
 454 * @xhci: pointer to xhci structure
 455 * @port: one-based port number of the port in this roothub.
 456 *
 457 * Return: Slot id of the usb device connected to the root port, 0 if not found
 458 */
 459
 460int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 461		u16 port)
 462{
 463	int slot_id;
 464	int i;
 465	enum usb_device_speed speed;
 466
 467	slot_id = 0;
 468	for (i = 0; i < MAX_HC_SLOTS; i++) {
 469		if (!xhci->devs[i] || !xhci->devs[i]->udev)
 470			continue;
 471		speed = xhci->devs[i]->udev->speed;
 472		if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
 473				&& xhci->devs[i]->fake_port == port) {
 474			slot_id = i;
 475			break;
 476		}
 477	}
 478
 479	return slot_id;
 480}
 481EXPORT_SYMBOL_GPL(xhci_find_slot_id_by_port);
 482
 483/*
 484 * Stop device
 485 * It issues stop endpoint command for EP 0 to 30. And wait the last command
 486 * to complete.
 487 * suspend will set to 1, if suspend bit need to set in command.
 488 */
 489static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 490{
 491	struct xhci_virt_device *virt_dev;
 492	struct xhci_command *cmd;
 493	unsigned long flags;
 494	int ret;
 495	int i;
 496
 497	ret = 0;
 498	virt_dev = xhci->devs[slot_id];
 499	if (!virt_dev)
 500		return -ENODEV;
 501
 502	trace_xhci_stop_device(virt_dev);
 503
 504	cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
 505	if (!cmd)
 506		return -ENOMEM;
 507
 508	spin_lock_irqsave(&xhci->lock, flags);
 509	for (i = LAST_EP_INDEX; i > 0; i--) {
 510		if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 511			struct xhci_ep_ctx *ep_ctx;
 512			struct xhci_command *command;
 513
 514			ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i);
 515
 516			/* Check ep is running, required by AMD SNPS 3.1 xHC */
 517			if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING)
 518				continue;
 519
 520			command = xhci_alloc_command(xhci, false, GFP_NOWAIT);
 521			if (!command) {
 522				spin_unlock_irqrestore(&xhci->lock, flags);
 523				ret = -ENOMEM;
 524				goto cmd_cleanup;
 525			}
 526
 527			ret = xhci_queue_stop_endpoint(xhci, command, slot_id,
 528						       i, suspend);
 529			if (ret) {
 530				spin_unlock_irqrestore(&xhci->lock, flags);
 531				xhci_free_command(xhci, command);
 532				goto cmd_cleanup;
 533			}
 534		}
 535	}
 536	ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 537	if (ret) {
 538		spin_unlock_irqrestore(&xhci->lock, flags);
 539		goto cmd_cleanup;
 540	}
 541
 542	xhci_ring_cmd_db(xhci);
 543	spin_unlock_irqrestore(&xhci->lock, flags);
 544
 545	/* Wait for last stop endpoint command to finish */
 546	wait_for_completion(cmd->completion);
 547
 548	if (cmd->status == COMP_COMMAND_ABORTED ||
 549	    cmd->status == COMP_COMMAND_RING_STOPPED) {
 550		xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 551		ret = -ETIME;
 552	}
 553
 554cmd_cleanup:
 555	xhci_free_command(xhci, cmd);
 556	return ret;
 557}
 558
 559/*
 560 * Ring device, it rings the all doorbells unconditionally.
 561 */
 562void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 563{
 564	int i, s;
 565	struct xhci_virt_ep *ep;
 566
 567	for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 568		ep = &xhci->devs[slot_id]->eps[i];
 569
 570		if (ep->ep_state & EP_HAS_STREAMS) {
 571			for (s = 1; s < ep->stream_info->num_streams; s++)
 572				xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 573		} else if (ep->ring && ep->ring->dequeue) {
 574			xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 575		}
 576	}
 577
 578	return;
 579}
 580
 581static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 582		u16 wIndex, __le32 __iomem *addr, u32 port_status)
 583{
 584	/* Don't allow the USB core to disable SuperSpeed ports. */
 585	if (hcd->speed >= HCD_USB3) {
 586		xhci_dbg(xhci, "Ignoring request to disable "
 587				"SuperSpeed port.\n");
 588		return;
 589	}
 590
 591	if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
 592		xhci_dbg(xhci,
 593			 "Broken Port Enabled/Disabled, ignoring port disable request.\n");
 594		return;
 595	}
 596
 597	/* Write 1 to disable the port */
 598	writel(port_status | PORT_PE, addr);
 599	port_status = readl(addr);
 600	xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n",
 601		 hcd->self.busnum, wIndex + 1, port_status);
 602}
 603
 604static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 605		u16 wIndex, __le32 __iomem *addr, u32 port_status)
 606{
 607	char *port_change_bit;
 608	u32 status;
 609
 610	switch (wValue) {
 611	case USB_PORT_FEAT_C_RESET:
 612		status = PORT_RC;
 613		port_change_bit = "reset";
 614		break;
 615	case USB_PORT_FEAT_C_BH_PORT_RESET:
 616		status = PORT_WRC;
 617		port_change_bit = "warm(BH) reset";
 618		break;
 619	case USB_PORT_FEAT_C_CONNECTION:
 620		status = PORT_CSC;
 621		port_change_bit = "connect";
 622		break;
 623	case USB_PORT_FEAT_C_OVER_CURRENT:
 624		status = PORT_OCC;
 625		port_change_bit = "over-current";
 626		break;
 627	case USB_PORT_FEAT_C_ENABLE:
 628		status = PORT_PEC;
 629		port_change_bit = "enable/disable";
 630		break;
 631	case USB_PORT_FEAT_C_SUSPEND:
 632		status = PORT_PLC;
 633		port_change_bit = "suspend/resume";
 634		break;
 635	case USB_PORT_FEAT_C_PORT_LINK_STATE:
 636		status = PORT_PLC;
 637		port_change_bit = "link state";
 638		break;
 639	case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 640		status = PORT_CEC;
 641		port_change_bit = "config error";
 642		break;
 643	default:
 644		/* Should never happen */
 645		return;
 646	}
 647	/* Change bits are all write 1 to clear */
 648	writel(port_status | status, addr);
 649	port_status = readl(addr);
 650
 651	xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n",
 652		 wIndex + 1, port_change_bit, port_status);
 653}
 654
 655struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
 656{
 657	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 658
 659	if (hcd->speed >= HCD_USB3)
 660		return &xhci->usb3_rhub;
 661	return &xhci->usb2_rhub;
 662}
 663
 664/*
 665 * xhci_set_port_power() must be called with xhci->lock held.
 666 * It will release and re-aquire the lock while calling ACPI
 667 * method.
 668 */
 669static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd,
 670				u16 index, bool on, unsigned long *flags)
 671	__must_hold(&xhci->lock)
 672{
 673	struct xhci_hub *rhub;
 674	struct xhci_port *port;
 675	u32 temp;
 676
 677	rhub = xhci_get_rhub(hcd);
 678	port = rhub->ports[index];
 679	temp = readl(port->addr);
 680
 681	xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n",
 682		 hcd->self.busnum, index + 1, on ? "ON" : "OFF", temp);
 683
 684	temp = xhci_port_state_to_neutral(temp);
 685
 686	if (on) {
 687		/* Power on */
 688		writel(temp | PORT_POWER, port->addr);
 689		readl(port->addr);
 690	} else {
 691		/* Power off */
 692		writel(temp & ~PORT_POWER, port->addr);
 693	}
 694
 695	spin_unlock_irqrestore(&xhci->lock, *flags);
 696	temp = usb_acpi_power_manageable(hcd->self.root_hub,
 697					index);
 698	if (temp)
 699		usb_acpi_set_power_state(hcd->self.root_hub,
 700			index, on);
 701	spin_lock_irqsave(&xhci->lock, *flags);
 702}
 703
 704static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
 705	u16 test_mode, u16 wIndex)
 706{
 707	u32 temp;
 708	struct xhci_port *port;
 709
 710	/* xhci only supports test mode for usb2 ports */
 711	port = xhci->usb2_rhub.ports[wIndex];
 712	temp = readl(port->addr + PORTPMSC);
 713	temp |= test_mode << PORT_TEST_MODE_SHIFT;
 714	writel(temp, port->addr + PORTPMSC);
 715	xhci->test_mode = test_mode;
 716	if (test_mode == USB_TEST_FORCE_ENABLE)
 717		xhci_start(xhci);
 718}
 719
 720static int xhci_enter_test_mode(struct xhci_hcd *xhci,
 721				u16 test_mode, u16 wIndex, unsigned long *flags)
 722	__must_hold(&xhci->lock)
 723{
 724	struct usb_hcd *usb3_hcd = xhci_get_usb3_hcd(xhci);
 725	int i, retval;
 726
 727	/* Disable all Device Slots */
 728	xhci_dbg(xhci, "Disable all slots\n");
 729	spin_unlock_irqrestore(&xhci->lock, *flags);
 730	for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 731		if (!xhci->devs[i])
 732			continue;
 733
 734		retval = xhci_disable_slot(xhci, i);
 735		xhci_free_virt_device(xhci, i);
 736		if (retval)
 737			xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 738				 i, retval);
 739	}
 740	spin_lock_irqsave(&xhci->lock, *flags);
 741	/* Put all ports to the Disable state by clear PP */
 742	xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 743	/* Power off USB3 ports*/
 744	for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
 745		xhci_set_port_power(xhci, usb3_hcd, i, false, flags);
 746	/* Power off USB2 ports*/
 747	for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
 748		xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags);
 749	/* Stop the controller */
 750	xhci_dbg(xhci, "Stop controller\n");
 751	retval = xhci_halt(xhci);
 752	if (retval)
 753		return retval;
 754	/* Disable runtime PM for test mode */
 755	pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller);
 756	/* Set PORTPMSC.PTC field to enter selected test mode */
 757	/* Port is selected by wIndex. port_id = wIndex + 1 */
 758	xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n",
 759					test_mode, wIndex + 1);
 760	xhci_port_set_test_mode(xhci, test_mode, wIndex);
 761	return retval;
 762}
 763
 764static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 765{
 766	int retval;
 767
 768	if (!xhci->test_mode) {
 769		xhci_err(xhci, "Not in test mode, do nothing.\n");
 770		return 0;
 771	}
 772	if (xhci->test_mode == USB_TEST_FORCE_ENABLE &&
 773		!(xhci->xhc_state & XHCI_STATE_HALTED)) {
 774		retval = xhci_halt(xhci);
 775		if (retval)
 776			return retval;
 777	}
 778	pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 779	xhci->test_mode = 0;
 780	return xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 781}
 782
 783void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
 784			 u32 link_state)
 785{
 786	u32 temp;
 787	u32 portsc;
 788
 789	portsc = readl(port->addr);
 790	temp = xhci_port_state_to_neutral(portsc);
 791	temp &= ~PORT_PLS_MASK;
 792	temp |= PORT_LINK_STROBE | link_state;
 793	writel(temp, port->addr);
 794
 795	xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x",
 796		 port->rhub->hcd->self.busnum, port->hcd_portnum + 1,
 797		 portsc, temp);
 798}
 799
 800static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 801				      struct xhci_port *port, u16 wake_mask)
 802{
 803	u32 temp;
 804
 805	temp = readl(port->addr);
 806	temp = xhci_port_state_to_neutral(temp);
 807
 808	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 809		temp |= PORT_WKCONN_E;
 810	else
 811		temp &= ~PORT_WKCONN_E;
 812
 813	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 814		temp |= PORT_WKDISC_E;
 815	else
 816		temp &= ~PORT_WKDISC_E;
 817
 818	if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 819		temp |= PORT_WKOC_E;
 820	else
 821		temp &= ~PORT_WKOC_E;
 822
 823	writel(temp, port->addr);
 824}
 825
 826/* Test and clear port RWC bit */
 827void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 828			     u32 port_bit)
 829{
 830	u32 temp;
 831
 832	temp = readl(port->addr);
 833	if (temp & port_bit) {
 834		temp = xhci_port_state_to_neutral(temp);
 835		temp |= port_bit;
 836		writel(temp, port->addr);
 837	}
 838}
 839
 840/* Updates Link Status for super Speed port */
 841static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 842		u32 *status, u32 status_reg)
 843{
 844	u32 pls = status_reg & PORT_PLS_MASK;
 845
 846	/* When the CAS bit is set then warm reset
 847	 * should be performed on port
 848	 */
 849	if (status_reg & PORT_CAS) {
 850		/* The CAS bit can be set while the port is
 851		 * in any link state.
 852		 * Only roothubs have CAS bit, so we
 853		 * pretend to be in compliance mode
 854		 * unless we're already in compliance
 855		 * or the inactive state.
 856		 */
 857		if (pls != USB_SS_PORT_LS_COMP_MOD &&
 858		    pls != USB_SS_PORT_LS_SS_INACTIVE) {
 859			pls = USB_SS_PORT_LS_COMP_MOD;
 860		}
 861		/* Return also connection bit -
 862		 * hub state machine resets port
 863		 * when this bit is set.
 864		 */
 865		pls |= USB_PORT_STAT_CONNECTION;
 866	} else {
 867		/*
 868		 * Resume state is an xHCI internal state.  Do not report it to
 869		 * usb core, instead, pretend to be U3, thus usb core knows
 870		 * it's not ready for transfer.
 871		 */
 872		if (pls == XDEV_RESUME) {
 873			*status |= USB_SS_PORT_LS_U3;
 874			return;
 875		}
 876
 877		/*
 878		 * If CAS bit isn't set but the Port is already at
 879		 * Compliance Mode, fake a connection so the USB core
 880		 * notices the Compliance state and resets the port.
 881		 * This resolves an issue generated by the SN65LVPE502CP
 882		 * in which sometimes the port enters compliance mode
 883		 * caused by a delay on the host-device negotiation.
 884		 */
 885		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 886				(pls == USB_SS_PORT_LS_COMP_MOD))
 887			pls |= USB_PORT_STAT_CONNECTION;
 888	}
 889
 890	/* update status field */
 891	*status |= pls;
 892}
 893
 894/*
 895 * Function for Compliance Mode Quirk.
 896 *
 897 * This Function verifies if all xhc USB3 ports have entered U0, if so,
 898 * the compliance mode timer is deleted. A port won't enter
 899 * compliance mode if it has previously entered U0.
 900 */
 901static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 902				    u16 wIndex)
 903{
 904	u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1);
 905	bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 906
 907	if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 908		return;
 909
 910	if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 911		xhci->port_status_u0 |= 1 << wIndex;
 912		if (xhci->port_status_u0 == all_ports_seen_u0) {
 913			del_timer_sync(&xhci->comp_mode_recovery_timer);
 914			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 915				"All USB3 ports have entered U0 already!");
 916			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 917				"Compliance Mode Recovery Timer Deleted.");
 918		}
 919	}
 920}
 921
 922static int xhci_handle_usb2_port_link_resume(struct xhci_port *port,
 923					     u32 *status, u32 portsc,
 924					     unsigned long *flags)
 925{
 926	struct xhci_bus_state *bus_state;
 927	struct xhci_hcd	*xhci;
 928	struct usb_hcd *hcd;
 929	int slot_id;
 930	u32 wIndex;
 931
 932	hcd = port->rhub->hcd;
 933	bus_state = &port->rhub->bus_state;
 934	xhci = hcd_to_xhci(hcd);
 935	wIndex = port->hcd_portnum;
 936
 937	if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) {
 938		*status = 0xffffffff;
 939		return -EINVAL;
 940	}
 941	/* did port event handler already start resume timing? */
 942	if (!bus_state->resume_done[wIndex]) {
 943		/* If not, maybe we are in a host initated resume? */
 944		if (test_bit(wIndex, &bus_state->resuming_ports)) {
 945			/* Host initated resume doesn't time the resume
 946			 * signalling using resume_done[].
 947			 * It manually sets RESUME state, sleeps 20ms
 948			 * and sets U0 state. This should probably be
 949			 * changed, but not right now.
 950			 */
 951		} else {
 952			/* port resume was discovered now and here,
 953			 * start resume timing
 954			 */
 955			unsigned long timeout = jiffies +
 956				msecs_to_jiffies(USB_RESUME_TIMEOUT);
 957
 958			set_bit(wIndex, &bus_state->resuming_ports);
 959			bus_state->resume_done[wIndex] = timeout;
 960			mod_timer(&hcd->rh_timer, timeout);
 961			usb_hcd_start_port_resume(&hcd->self, wIndex);
 962		}
 963	/* Has resume been signalled for USB_RESUME_TIME yet? */
 964	} else if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) {
 965		int time_left;
 966
 967		xhci_dbg(xhci, "resume USB2 port %d-%d\n",
 968			 hcd->self.busnum, wIndex + 1);
 969
 970		bus_state->resume_done[wIndex] = 0;
 971		clear_bit(wIndex, &bus_state->resuming_ports);
 972
 973		set_bit(wIndex, &bus_state->rexit_ports);
 974
 975		xhci_test_and_clear_bit(xhci, port, PORT_PLC);
 976		xhci_set_link_state(xhci, port, XDEV_U0);
 977
 978		spin_unlock_irqrestore(&xhci->lock, *flags);
 979		time_left = wait_for_completion_timeout(
 980			&bus_state->rexit_done[wIndex],
 981			msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS));
 982		spin_lock_irqsave(&xhci->lock, *flags);
 983
 984		if (time_left) {
 985			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 986							    wIndex + 1);
 987			if (!slot_id) {
 988				xhci_dbg(xhci, "slot_id is zero\n");
 989				*status = 0xffffffff;
 990				return -ENODEV;
 991			}
 992			xhci_ring_device(xhci, slot_id);
 993		} else {
 994			int port_status = readl(port->addr);
 995
 996			xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n",
 997				  hcd->self.busnum, wIndex + 1, port_status);
 998			*status |= USB_PORT_STAT_SUSPEND;
 999			clear_bit(wIndex, &bus_state->rexit_ports);
1000		}
1001
1002		usb_hcd_end_port_resume(&hcd->self, wIndex);
1003		bus_state->port_c_suspend |= 1 << wIndex;
1004		bus_state->suspended_ports &= ~(1 << wIndex);
1005	} else {
1006		/*
1007		 * The resume has been signaling for less than
1008		 * USB_RESUME_TIME. Report the port status as SUSPEND,
1009		 * let the usbcore check port status again and clear
1010		 * resume signaling later.
1011		 */
1012		*status |= USB_PORT_STAT_SUSPEND;
1013	}
1014	return 0;
1015}
1016
1017static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
1018{
1019	u32 ext_stat = 0;
1020	int speed_id;
1021
1022	/* only support rx and tx lane counts of 1 in usb3.1 spec */
1023	speed_id = DEV_PORT_SPEED(raw_port_status);
1024	ext_stat |= speed_id;		/* bits 3:0, RX speed id */
1025	ext_stat |= speed_id << 4;	/* bits 7:4, TX speed id */
1026
1027	ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
1028	ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
1029
1030	return ext_stat;
1031}
1032
1033static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
1034				      u32 portsc)
1035{
1036	struct xhci_bus_state *bus_state;
1037	struct xhci_hcd	*xhci;
1038	struct usb_hcd *hcd;
1039	u32 link_state;
1040	u32 portnum;
1041
1042	bus_state = &port->rhub->bus_state;
1043	xhci = hcd_to_xhci(port->rhub->hcd);
1044	hcd = port->rhub->hcd;
1045	link_state = portsc & PORT_PLS_MASK;
1046	portnum = port->hcd_portnum;
1047
1048	/* USB3 specific wPortChange bits
1049	 *
1050	 * Port link change with port in resume state should not be
1051	 * reported to usbcore, as this is an internal state to be
1052	 * handled by xhci driver. Reporting PLC to usbcore may
1053	 * cause usbcore clearing PLC first and port change event
1054	 * irq won't be generated.
1055	 */
1056
1057	if (portsc & PORT_PLC && (link_state != XDEV_RESUME))
1058		*status |= USB_PORT_STAT_C_LINK_STATE << 16;
1059	if (portsc & PORT_WRC)
1060		*status |= USB_PORT_STAT_C_BH_RESET << 16;
1061	if (portsc & PORT_CEC)
1062		*status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
1063
1064	/* USB3 specific wPortStatus bits */
1065	if (portsc & PORT_POWER) {
1066		*status |= USB_SS_PORT_STAT_POWER;
1067		/* link state handling */
1068		if (link_state == XDEV_U0)
1069			bus_state->suspended_ports &= ~(1 << portnum);
1070	}
1071
1072	/* remote wake resume signaling complete */
1073	if (bus_state->port_remote_wakeup & (1 << portnum) &&
1074	    link_state != XDEV_RESUME &&
1075	    link_state != XDEV_RECOVERY) {
1076		bus_state->port_remote_wakeup &= ~(1 << portnum);
1077		usb_hcd_end_port_resume(&hcd->self, portnum);
1078	}
1079
1080	xhci_hub_report_usb3_link_state(xhci, status, portsc);
1081	xhci_del_comp_mod_timer(xhci, portsc, portnum);
1082}
1083
1084static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
1085				      u32 portsc, unsigned long *flags)
1086{
1087	struct xhci_bus_state *bus_state;
1088	u32 link_state;
1089	u32 portnum;
1090	int ret;
1091
1092	bus_state = &port->rhub->bus_state;
1093	link_state = portsc & PORT_PLS_MASK;
1094	portnum = port->hcd_portnum;
1095
1096	/* USB2 wPortStatus bits */
1097	if (portsc & PORT_POWER) {
1098		*status |= USB_PORT_STAT_POWER;
1099
1100		/* link state is only valid if port is powered */
1101		if (link_state == XDEV_U3)
1102			*status |= USB_PORT_STAT_SUSPEND;
1103		if (link_state == XDEV_U2)
1104			*status |= USB_PORT_STAT_L1;
1105		if (link_state == XDEV_U0) {
1106			if (bus_state->resume_done[portnum])
1107				usb_hcd_end_port_resume(&port->rhub->hcd->self,
1108							portnum);
1109			bus_state->resume_done[portnum] = 0;
1110			clear_bit(portnum, &bus_state->resuming_ports);
1111			if (bus_state->suspended_ports & (1 << portnum)) {
1112				bus_state->suspended_ports &= ~(1 << portnum);
1113				bus_state->port_c_suspend |= 1 << portnum;
1114			}
1115		}
1116		if (link_state == XDEV_RESUME) {
1117			ret = xhci_handle_usb2_port_link_resume(port, status,
1118								portsc, flags);
1119			if (ret)
1120				return;
1121		}
1122	}
1123}
1124
1125/*
1126 * Converts a raw xHCI port status into the format that external USB 2.0 or USB
1127 * 3.0 hubs use.
1128 *
1129 * Possible side effects:
1130 *  - Mark a port as being done with device resume,
1131 *    and ring the endpoint doorbells.
1132 *  - Stop the Synopsys redriver Compliance Mode polling.
1133 *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
1134 */
1135static u32 xhci_get_port_status(struct usb_hcd *hcd,
1136		struct xhci_bus_state *bus_state,
1137	u16 wIndex, u32 raw_port_status,
1138		unsigned long *flags)
1139	__releases(&xhci->lock)
1140	__acquires(&xhci->lock)
1141{
1142	u32 status = 0;
1143	struct xhci_hub *rhub;
1144	struct xhci_port *port;
1145
1146	rhub = xhci_get_rhub(hcd);
1147	port = rhub->ports[wIndex];
1148
1149	/* common wPortChange bits */
1150	if (raw_port_status & PORT_CSC)
1151		status |= USB_PORT_STAT_C_CONNECTION << 16;
1152	if (raw_port_status & PORT_PEC)
1153		status |= USB_PORT_STAT_C_ENABLE << 16;
1154	if ((raw_port_status & PORT_OCC))
1155		status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1156	if ((raw_port_status & PORT_RC))
1157		status |= USB_PORT_STAT_C_RESET << 16;
1158
1159	/* common wPortStatus bits */
1160	if (raw_port_status & PORT_CONNECT) {
1161		status |= USB_PORT_STAT_CONNECTION;
1162		status |= xhci_port_speed(raw_port_status);
1163	}
1164	if (raw_port_status & PORT_PE)
1165		status |= USB_PORT_STAT_ENABLE;
1166	if (raw_port_status & PORT_OC)
1167		status |= USB_PORT_STAT_OVERCURRENT;
1168	if (raw_port_status & PORT_RESET)
1169		status |= USB_PORT_STAT_RESET;
1170
1171	/* USB2 and USB3 specific bits, including Port Link State */
1172	if (hcd->speed >= HCD_USB3)
1173		xhci_get_usb3_port_status(port, &status, raw_port_status);
1174	else
1175		xhci_get_usb2_port_status(port, &status, raw_port_status,
1176					  flags);
1177	/*
1178	 * Clear stale usb2 resume signalling variables in case port changed
1179	 * state during resume signalling. For example on error
1180	 */
1181	if ((bus_state->resume_done[wIndex] ||
1182	     test_bit(wIndex, &bus_state->resuming_ports)) &&
1183	    (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
1184	    (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
1185		bus_state->resume_done[wIndex] = 0;
1186		clear_bit(wIndex, &bus_state->resuming_ports);
1187		usb_hcd_end_port_resume(&hcd->self, wIndex);
1188	}
1189
1190	if (bus_state->port_c_suspend & (1 << wIndex))
1191		status |= USB_PORT_STAT_C_SUSPEND << 16;
1192
1193	return status;
1194}
1195
1196int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
1197		u16 wIndex, char *buf, u16 wLength)
1198{
1199	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1200	int max_ports;
1201	unsigned long flags;
1202	u32 temp, status;
1203	int retval = 0;
1204	int slot_id;
1205	struct xhci_bus_state *bus_state;
1206	u16 link_state = 0;
1207	u16 wake_mask = 0;
1208	u16 timeout = 0;
1209	u16 test_mode = 0;
1210	struct xhci_hub *rhub;
1211	struct xhci_port **ports;
1212
1213	rhub = xhci_get_rhub(hcd);
1214	ports = rhub->ports;
1215	max_ports = rhub->num_ports;
1216	bus_state = &rhub->bus_state;
1217
1218	spin_lock_irqsave(&xhci->lock, flags);
1219	switch (typeReq) {
1220	case GetHubStatus:
1221		/* No power source, over-current reported per port */
1222		memset(buf, 0, 4);
1223		break;
1224	case GetHubDescriptor:
1225		/* Check to make sure userspace is asking for the USB 3.0 hub
1226		 * descriptor for the USB 3.0 roothub.  If not, we stall the
1227		 * endpoint, like external hubs do.
1228		 */
1229		if (hcd->speed >= HCD_USB3 &&
1230				(wLength < USB_DT_SS_HUB_SIZE ||
1231				 wValue != (USB_DT_SS_HUB << 8))) {
1232			xhci_dbg(xhci, "Wrong hub descriptor type for "
1233					"USB 3.0 roothub.\n");
1234			goto error;
1235		}
1236		xhci_hub_descriptor(hcd, xhci,
1237				(struct usb_hub_descriptor *) buf);
1238		break;
1239	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1240		if ((wValue & 0xff00) != (USB_DT_BOS << 8))
1241			goto error;
1242
1243		if (hcd->speed < HCD_USB3)
1244			goto error;
1245
1246		retval = xhci_create_usb3x_bos_desc(xhci, buf, wLength);
1247		spin_unlock_irqrestore(&xhci->lock, flags);
1248		return retval;
1249	case GetPortStatus:
1250		if (!wIndex || wIndex > max_ports)
1251			goto error;
1252		wIndex--;
1253		temp = readl(ports[wIndex]->addr);
1254		if (temp == ~(u32)0) {
1255			xhci_hc_died(xhci);
1256			retval = -ENODEV;
1257			break;
1258		}
1259		trace_xhci_get_port_status(wIndex, temp);
1260		status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
1261					      &flags);
1262		if (status == 0xffffffff)
1263			goto error;
1264
1265		xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x",
1266			 hcd->self.busnum, wIndex + 1, temp, status);
1267
1268		put_unaligned(cpu_to_le32(status), (__le32 *) buf);
1269		/* if USB 3.1 extended port status return additional 4 bytes */
1270		if (wValue == 0x02) {
1271			u32 port_li;
1272
1273			if (hcd->speed < HCD_USB31 || wLength != 8) {
1274				xhci_err(xhci, "get ext port status invalid parameter\n");
1275				retval = -EINVAL;
1276				break;
1277			}
1278			port_li = readl(ports[wIndex]->addr + PORTLI);
1279			status = xhci_get_ext_port_status(temp, port_li);
1280			put_unaligned_le32(status, &buf[4]);
1281		}
1282		break;
1283	case SetPortFeature:
1284		if (wValue == USB_PORT_FEAT_LINK_STATE)
1285			link_state = (wIndex & 0xff00) >> 3;
1286		if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
1287			wake_mask = wIndex & 0xff00;
1288		if (wValue == USB_PORT_FEAT_TEST)
1289			test_mode = (wIndex & 0xff00) >> 8;
1290		/* The MSB of wIndex is the U1/U2 timeout */
1291		timeout = (wIndex & 0xff00) >> 8;
1292		wIndex &= 0xff;
1293		if (!wIndex || wIndex > max_ports)
1294			goto error;
1295		wIndex--;
1296		temp = readl(ports[wIndex]->addr);
1297		if (temp == ~(u32)0) {
1298			xhci_hc_died(xhci);
1299			retval = -ENODEV;
1300			break;
1301		}
1302		temp = xhci_port_state_to_neutral(temp);
1303		/* FIXME: What new port features do we need to support? */
1304		switch (wValue) {
1305		case USB_PORT_FEAT_SUSPEND:
1306			temp = readl(ports[wIndex]->addr);
1307			if ((temp & PORT_PLS_MASK) != XDEV_U0) {
1308				/* Resume the port to U0 first */
1309				xhci_set_link_state(xhci, ports[wIndex],
1310							XDEV_U0);
1311				spin_unlock_irqrestore(&xhci->lock, flags);
1312				msleep(10);
1313				spin_lock_irqsave(&xhci->lock, flags);
1314			}
1315			/* In spec software should not attempt to suspend
1316			 * a port unless the port reports that it is in the
1317			 * enabled (PED = ‘1’,PLS < ‘3’) state.
1318			 */
1319			temp = readl(ports[wIndex]->addr);
1320			if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1321				|| (temp & PORT_PLS_MASK) >= XDEV_U3) {
1322				xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n",
1323					  hcd->self.busnum, wIndex + 1);
1324				goto error;
1325			}
1326
1327			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1328					wIndex + 1);
1329			if (!slot_id) {
1330				xhci_warn(xhci, "slot_id is zero\n");
1331				goto error;
1332			}
1333			/* unlock to execute stop endpoint commands */
1334			spin_unlock_irqrestore(&xhci->lock, flags);
1335			xhci_stop_device(xhci, slot_id, 1);
1336			spin_lock_irqsave(&xhci->lock, flags);
1337
1338			xhci_set_link_state(xhci, ports[wIndex], XDEV_U3);
1339
1340			spin_unlock_irqrestore(&xhci->lock, flags);
1341			msleep(10); /* wait device to enter */
1342			spin_lock_irqsave(&xhci->lock, flags);
1343
1344			temp = readl(ports[wIndex]->addr);
1345			bus_state->suspended_ports |= 1 << wIndex;
1346			break;
1347		case USB_PORT_FEAT_LINK_STATE:
1348			temp = readl(ports[wIndex]->addr);
1349			/* Disable port */
1350			if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1351				xhci_dbg(xhci, "Disable port %d-%d\n",
1352					 hcd->self.busnum, wIndex + 1);
1353				temp = xhci_port_state_to_neutral(temp);
1354				/*
1355				 * Clear all change bits, so that we get a new
1356				 * connection event.
1357				 */
1358				temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1359					PORT_OCC | PORT_RC | PORT_PLC |
1360					PORT_CEC;
1361				writel(temp | PORT_PE, ports[wIndex]->addr);
1362				temp = readl(ports[wIndex]->addr);
1363				break;
1364			}
1365
1366			/* Put link in RxDetect (enable port) */
1367			if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1368				xhci_dbg(xhci, "Enable port %d-%d\n",
1369					 hcd->self.busnum, wIndex + 1);
1370				xhci_set_link_state(xhci, ports[wIndex],
1371							link_state);
1372				temp = readl(ports[wIndex]->addr);
1373				break;
1374			}
1375
1376			/*
1377			 * For xHCI 1.1 according to section 4.19.1.2.4.1 a
1378			 * root hub port's transition to compliance mode upon
1379			 * detecting LFPS timeout may be controlled by an
1380			 * Compliance Transition Enabled (CTE) flag (not
1381			 * software visible). This flag is set by writing 0xA
1382			 * to PORTSC PLS field which will allow transition to
1383			 * compliance mode the next time LFPS timeout is
1384			 * encountered. A warm reset will clear it.
1385			 *
1386			 * The CTE flag is only supported if the HCCPARAMS2 CTC
1387			 * flag is set, otherwise, the compliance substate is
1388			 * automatically entered as on 1.0 and prior.
1389			 */
1390			if (link_state == USB_SS_PORT_LS_COMP_MOD) {
1391				if (!HCC2_CTC(xhci->hcc_params2)) {
1392					xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
1393					break;
1394				}
1395
1396				if ((temp & PORT_CONNECT)) {
1397					xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
1398					goto error;
1399				}
1400
1401				xhci_dbg(xhci, "Enable compliance mode transition for port %d-%d\n",
1402					 hcd->self.busnum, wIndex + 1);
1403				xhci_set_link_state(xhci, ports[wIndex],
1404						link_state);
1405
1406				temp = readl(ports[wIndex]->addr);
1407				break;
1408			}
1409			/* Port must be enabled */
1410			if (!(temp & PORT_PE)) {
1411				retval = -ENODEV;
1412				break;
1413			}
1414			/* Can't set port link state above '3' (U3) */
1415			if (link_state > USB_SS_PORT_LS_U3) {
1416				xhci_warn(xhci, "Cannot set port %d-%d link state %d\n",
1417					  hcd->self.busnum, wIndex + 1,
1418					  link_state);
1419				goto error;
1420			}
1421
1422			/*
1423			 * set link to U0, steps depend on current link state.
1424			 * U3: set link to U0 and wait for u3exit completion.
1425			 * U1/U2:  no PLC complete event, only set link to U0.
1426			 * Resume/Recovery: device initiated U0, only wait for
1427			 * completion
1428			 */
1429			if (link_state == USB_SS_PORT_LS_U0) {
1430				u32 pls = temp & PORT_PLS_MASK;
1431				bool wait_u0 = false;
1432
1433				/* already in U0 */
1434				if (pls == XDEV_U0)
1435					break;
1436				if (pls == XDEV_U3 ||
1437				    pls == XDEV_RESUME ||
1438				    pls == XDEV_RECOVERY) {
1439					wait_u0 = true;
1440					reinit_completion(&bus_state->u3exit_done[wIndex]);
1441				}
1442				if (pls <= XDEV_U3) /* U1, U2, U3 */
1443					xhci_set_link_state(xhci, ports[wIndex],
1444							    USB_SS_PORT_LS_U0);
1445				if (!wait_u0) {
1446					if (pls > XDEV_U3)
1447						goto error;
1448					break;
1449				}
1450				spin_unlock_irqrestore(&xhci->lock, flags);
1451				if (!wait_for_completion_timeout(&bus_state->u3exit_done[wIndex],
1452								 msecs_to_jiffies(500)))
1453					xhci_dbg(xhci, "missing U0 port change event for port %d-%d\n",
1454						 hcd->self.busnum, wIndex + 1);
1455				spin_lock_irqsave(&xhci->lock, flags);
1456				temp = readl(ports[wIndex]->addr);
1457				break;
1458			}
1459
1460			if (link_state == USB_SS_PORT_LS_U3) {
1461				int retries = 16;
1462				slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1463						wIndex + 1);
1464				if (slot_id) {
1465					/* unlock to execute stop endpoint
1466					 * commands */
1467					spin_unlock_irqrestore(&xhci->lock,
1468								flags);
1469					xhci_stop_device(xhci, slot_id, 1);
1470					spin_lock_irqsave(&xhci->lock, flags);
1471				}
1472				xhci_set_link_state(xhci, ports[wIndex], USB_SS_PORT_LS_U3);
1473				spin_unlock_irqrestore(&xhci->lock, flags);
1474				while (retries--) {
1475					usleep_range(4000, 8000);
1476					temp = readl(ports[wIndex]->addr);
1477					if ((temp & PORT_PLS_MASK) == XDEV_U3)
1478						break;
1479				}
1480				spin_lock_irqsave(&xhci->lock, flags);
1481				temp = readl(ports[wIndex]->addr);
1482				bus_state->suspended_ports |= 1 << wIndex;
1483			}
1484			break;
1485		case USB_PORT_FEAT_POWER:
1486			/*
1487			 * Turn on ports, even if there isn't per-port switching.
1488			 * HC will report connect events even before this is set.
1489			 * However, hub_wq will ignore the roothub events until
1490			 * the roothub is registered.
1491			 */
1492			xhci_set_port_power(xhci, hcd, wIndex, true, &flags);
1493			break;
1494		case USB_PORT_FEAT_RESET:
1495			temp = (temp | PORT_RESET);
1496			writel(temp, ports[wIndex]->addr);
1497
1498			temp = readl(ports[wIndex]->addr);
1499			xhci_dbg(xhci, "set port reset, actual port %d-%d status  = 0x%x\n",
1500				 hcd->self.busnum, wIndex + 1, temp);
1501			break;
1502		case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1503			xhci_set_remote_wake_mask(xhci, ports[wIndex],
1504						  wake_mask);
1505			temp = readl(ports[wIndex]->addr);
1506			xhci_dbg(xhci, "set port remote wake mask, actual port %d-%d status  = 0x%x\n",
1507				 hcd->self.busnum, wIndex + 1, temp);
1508			break;
1509		case USB_PORT_FEAT_BH_PORT_RESET:
1510			temp |= PORT_WR;
1511			writel(temp, ports[wIndex]->addr);
1512			temp = readl(ports[wIndex]->addr);
1513			break;
1514		case USB_PORT_FEAT_U1_TIMEOUT:
1515			if (hcd->speed < HCD_USB3)
1516				goto error;
1517			temp = readl(ports[wIndex]->addr + PORTPMSC);
1518			temp &= ~PORT_U1_TIMEOUT_MASK;
1519			temp |= PORT_U1_TIMEOUT(timeout);
1520			writel(temp, ports[wIndex]->addr + PORTPMSC);
1521			break;
1522		case USB_PORT_FEAT_U2_TIMEOUT:
1523			if (hcd->speed < HCD_USB3)
1524				goto error;
1525			temp = readl(ports[wIndex]->addr + PORTPMSC);
1526			temp &= ~PORT_U2_TIMEOUT_MASK;
1527			temp |= PORT_U2_TIMEOUT(timeout);
1528			writel(temp, ports[wIndex]->addr + PORTPMSC);
1529			break;
1530		case USB_PORT_FEAT_TEST:
1531			/* 4.19.6 Port Test Modes (USB2 Test Mode) */
1532			if (hcd->speed != HCD_USB2)
1533				goto error;
1534			if (test_mode > USB_TEST_FORCE_ENABLE ||
1535			    test_mode < USB_TEST_J)
1536				goto error;
1537			retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
1538						      &flags);
1539			break;
1540		default:
1541			goto error;
1542		}
1543		/* unblock any posted writes */
1544		temp = readl(ports[wIndex]->addr);
1545		break;
1546	case ClearPortFeature:
1547		if (!wIndex || wIndex > max_ports)
1548			goto error;
1549		wIndex--;
1550		temp = readl(ports[wIndex]->addr);
1551		if (temp == ~(u32)0) {
1552			xhci_hc_died(xhci);
1553			retval = -ENODEV;
1554			break;
1555		}
1556		/* FIXME: What new port features do we need to support? */
1557		temp = xhci_port_state_to_neutral(temp);
1558		switch (wValue) {
1559		case USB_PORT_FEAT_SUSPEND:
1560			temp = readl(ports[wIndex]->addr);
1561			xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1562			xhci_dbg(xhci, "PORTSC %04x\n", temp);
1563			if (temp & PORT_RESET)
1564				goto error;
1565			if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1566				if ((temp & PORT_PE) == 0)
1567					goto error;
1568
1569				set_bit(wIndex, &bus_state->resuming_ports);
1570				usb_hcd_start_port_resume(&hcd->self, wIndex);
1571				xhci_set_link_state(xhci, ports[wIndex],
1572						    XDEV_RESUME);
1573				spin_unlock_irqrestore(&xhci->lock, flags);
1574				msleep(USB_RESUME_TIMEOUT);
1575				spin_lock_irqsave(&xhci->lock, flags);
1576				xhci_set_link_state(xhci, ports[wIndex],
1577							XDEV_U0);
1578				clear_bit(wIndex, &bus_state->resuming_ports);
1579				usb_hcd_end_port_resume(&hcd->self, wIndex);
1580			}
1581			bus_state->port_c_suspend |= 1 << wIndex;
1582
1583			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1584					wIndex + 1);
1585			if (!slot_id) {
1586				xhci_dbg(xhci, "slot_id is zero\n");
1587				goto error;
1588			}
1589			xhci_ring_device(xhci, slot_id);
1590			break;
1591		case USB_PORT_FEAT_C_SUSPEND:
1592			bus_state->port_c_suspend &= ~(1 << wIndex);
1593			fallthrough;
1594		case USB_PORT_FEAT_C_RESET:
1595		case USB_PORT_FEAT_C_BH_PORT_RESET:
1596		case USB_PORT_FEAT_C_CONNECTION:
1597		case USB_PORT_FEAT_C_OVER_CURRENT:
1598		case USB_PORT_FEAT_C_ENABLE:
1599		case USB_PORT_FEAT_C_PORT_LINK_STATE:
1600		case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1601			xhci_clear_port_change_bit(xhci, wValue, wIndex,
1602					ports[wIndex]->addr, temp);
1603			break;
1604		case USB_PORT_FEAT_ENABLE:
1605			xhci_disable_port(hcd, xhci, wIndex,
1606					ports[wIndex]->addr, temp);
1607			break;
1608		case USB_PORT_FEAT_POWER:
1609			xhci_set_port_power(xhci, hcd, wIndex, false, &flags);
1610			break;
1611		case USB_PORT_FEAT_TEST:
1612			retval = xhci_exit_test_mode(xhci);
1613			break;
1614		default:
1615			goto error;
1616		}
1617		break;
1618	default:
1619error:
1620		/* "stall" on error */
1621		retval = -EPIPE;
1622	}
1623	spin_unlock_irqrestore(&xhci->lock, flags);
1624	return retval;
1625}
1626
1627/*
1628 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1629 * Ports are 0-indexed from the HCD point of view,
1630 * and 1-indexed from the USB core pointer of view.
1631 *
1632 * Note that the status change bits will be cleared as soon as a port status
1633 * change event is generated, so we use the saved status from that event.
1634 */
1635int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1636{
1637	unsigned long flags;
1638	u32 temp, status;
1639	u32 mask;
1640	int i, retval;
1641	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1642	int max_ports;
1643	struct xhci_bus_state *bus_state;
1644	bool reset_change = false;
1645	struct xhci_hub *rhub;
1646	struct xhci_port **ports;
1647
1648	rhub = xhci_get_rhub(hcd);
1649	ports = rhub->ports;
1650	max_ports = rhub->num_ports;
1651	bus_state = &rhub->bus_state;
1652
1653	/* Initial status is no changes */
1654	retval = (max_ports + 8) / 8;
1655	memset(buf, 0, retval);
1656
1657	/*
1658	 * Inform the usbcore about resume-in-progress by returning
1659	 * a non-zero value even if there are no status changes.
1660	 */
1661	spin_lock_irqsave(&xhci->lock, flags);
1662
1663	status = bus_state->resuming_ports;
1664
1665	/*
1666	 * SS devices are only visible to roothub after link training completes.
1667	 * Keep polling roothubs for a grace period after xHC start
1668	 */
1669	if (xhci->run_graceperiod) {
1670		if (time_before(jiffies, xhci->run_graceperiod))
1671			status = 1;
1672		else
1673			xhci->run_graceperiod = 0;
1674	}
1675
1676	mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1677
1678	/* For each port, did anything change?  If so, set that bit in buf. */
1679	for (i = 0; i < max_ports; i++) {
1680		temp = readl(ports[i]->addr);
1681		if (temp == ~(u32)0) {
1682			xhci_hc_died(xhci);
1683			retval = -ENODEV;
1684			break;
1685		}
1686		trace_xhci_hub_status_data(i, temp);
1687
1688		if ((temp & mask) != 0 ||
1689			(bus_state->port_c_suspend & 1 << i) ||
1690			(bus_state->resume_done[i] && time_after_eq(
1691			    jiffies, bus_state->resume_done[i]))) {
1692			buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1693			status = 1;
1694		}
1695		if ((temp & PORT_RC))
1696			reset_change = true;
1697		if (temp & PORT_OC)
1698			status = 1;
1699	}
1700	if (!status && !reset_change) {
1701		xhci_dbg(xhci, "%s: stopping usb%d port polling\n",
1702			 __func__, hcd->self.busnum);
1703		clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1704	}
1705	spin_unlock_irqrestore(&xhci->lock, flags);
1706	return status ? retval : 0;
1707}
1708
1709#ifdef CONFIG_PM
1710
1711int xhci_bus_suspend(struct usb_hcd *hcd)
1712{
1713	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1714	int max_ports, port_index;
1715	struct xhci_bus_state *bus_state;
1716	unsigned long flags;
1717	struct xhci_hub *rhub;
1718	struct xhci_port **ports;
1719	u32 portsc_buf[USB_MAXCHILDREN];
1720	bool wake_enabled;
1721
1722	rhub = xhci_get_rhub(hcd);
1723	ports = rhub->ports;
1724	max_ports = rhub->num_ports;
1725	bus_state = &rhub->bus_state;
1726	wake_enabled = hcd->self.root_hub->do_remote_wakeup;
1727
1728	spin_lock_irqsave(&xhci->lock, flags);
1729
1730	if (wake_enabled) {
1731		if (bus_state->resuming_ports ||	/* USB2 */
1732		    bus_state->port_remote_wakeup) {	/* USB3 */
1733			spin_unlock_irqrestore(&xhci->lock, flags);
1734			xhci_dbg(xhci, "usb%d bus suspend to fail because a port is resuming\n",
1735				 hcd->self.busnum);
1736			return -EBUSY;
1737		}
1738	}
1739	/*
1740	 * Prepare ports for suspend, but don't write anything before all ports
1741	 * are checked and we know bus suspend can proceed
1742	 */
1743	bus_state->bus_suspended = 0;
1744	port_index = max_ports;
1745	while (port_index--) {
1746		u32 t1, t2;
1747		int retries = 10;
1748retry:
1749		t1 = readl(ports[port_index]->addr);
1750		t2 = xhci_port_state_to_neutral(t1);
1751		portsc_buf[port_index] = 0;
1752
1753		/*
1754		 * Give a USB3 port in link training time to finish, but don't
1755		 * prevent suspend as port might be stuck
1756		 */
1757		if ((hcd->speed >= HCD_USB3) && retries-- &&
1758		    (t1 & PORT_PLS_MASK) == XDEV_POLLING) {
1759			spin_unlock_irqrestore(&xhci->lock, flags);
1760			msleep(XHCI_PORT_POLLING_LFPS_TIME);
1761			spin_lock_irqsave(&xhci->lock, flags);
1762			xhci_dbg(xhci, "port %d-%d polling in bus suspend, waiting\n",
1763				 hcd->self.busnum, port_index + 1);
1764			goto retry;
1765		}
1766		/* bail out if port detected a over-current condition */
1767		if (t1 & PORT_OC) {
1768			bus_state->bus_suspended = 0;
1769			spin_unlock_irqrestore(&xhci->lock, flags);
1770			xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n");
1771			return -EBUSY;
1772		}
1773		/* suspend ports in U0, or bail out for new connect changes */
1774		if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
1775			if ((t1 & PORT_CSC) && wake_enabled) {
1776				bus_state->bus_suspended = 0;
1777				spin_unlock_irqrestore(&xhci->lock, flags);
1778				xhci_dbg(xhci, "Bus suspend bailout, port connect change\n");
1779				return -EBUSY;
1780			}
1781			xhci_dbg(xhci, "port %d-%d not suspended\n",
1782				 hcd->self.busnum, port_index + 1);
1783			t2 &= ~PORT_PLS_MASK;
1784			t2 |= PORT_LINK_STROBE | XDEV_U3;
1785			set_bit(port_index, &bus_state->bus_suspended);
1786		}
1787		/* USB core sets remote wake mask for USB 3.0 hubs,
1788		 * including the USB 3.0 roothub, but only if CONFIG_PM
1789		 * is enabled, so also enable remote wake here.
1790		 */
1791		if (wake_enabled) {
1792			if (t1 & PORT_CONNECT) {
1793				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1794				t2 &= ~PORT_WKCONN_E;
1795			} else {
1796				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1797				t2 &= ~PORT_WKDISC_E;
1798			}
1799
1800			if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
1801			    (hcd->speed < HCD_USB3)) {
1802				if (usb_amd_pt_check_port(hcd->self.controller,
1803							  port_index))
1804					t2 &= ~PORT_WAKE_BITS;
1805			}
1806		} else
1807			t2 &= ~PORT_WAKE_BITS;
1808
1809		t1 = xhci_port_state_to_neutral(t1);
1810		if (t1 != t2)
1811			portsc_buf[port_index] = t2;
1812	}
1813
1814	/* write port settings, stopping and suspending ports if needed */
1815	port_index = max_ports;
1816	while (port_index--) {
1817		if (!portsc_buf[port_index])
1818			continue;
1819		if (test_bit(port_index, &bus_state->bus_suspended)) {
1820			int slot_id;
1821
1822			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1823							    port_index + 1);
1824			if (slot_id) {
1825				spin_unlock_irqrestore(&xhci->lock, flags);
1826				xhci_stop_device(xhci, slot_id, 1);
1827				spin_lock_irqsave(&xhci->lock, flags);
1828			}
1829		}
1830		writel(portsc_buf[port_index], ports[port_index]->addr);
1831	}
1832	hcd->state = HC_STATE_SUSPENDED;
1833	bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1834	spin_unlock_irqrestore(&xhci->lock, flags);
1835
1836	if (bus_state->bus_suspended)
1837		usleep_range(5000, 10000);
1838
1839	return 0;
1840}
1841
1842/*
1843 * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1844 * warm reset a USB3 device stuck in polling or compliance mode after resume.
1845 * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1846 */
1847static bool xhci_port_missing_cas_quirk(struct xhci_port *port)
1848{
1849	u32 portsc;
1850
1851	portsc = readl(port->addr);
1852
1853	/* if any of these are set we are not stuck */
1854	if (portsc & (PORT_CONNECT | PORT_CAS))
1855		return false;
1856
1857	if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1858	    ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1859		return false;
1860
1861	/* clear wakeup/change bits, and do a warm port reset */
1862	portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1863	portsc |= PORT_WR;
1864	writel(portsc, port->addr);
1865	/* flush write */
1866	readl(port->addr);
1867	return true;
1868}
1869
1870int xhci_bus_resume(struct usb_hcd *hcd)
1871{
1872	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
1873	struct xhci_bus_state *bus_state;
1874	unsigned long flags;
1875	int max_ports, port_index;
1876	int slot_id;
1877	int sret;
1878	u32 next_state;
1879	u32 temp, portsc;
1880	struct xhci_hub *rhub;
1881	struct xhci_port **ports;
1882
1883	rhub = xhci_get_rhub(hcd);
1884	ports = rhub->ports;
1885	max_ports = rhub->num_ports;
1886	bus_state = &rhub->bus_state;
1887
1888	if (time_before(jiffies, bus_state->next_statechange))
1889		msleep(5);
1890
1891	spin_lock_irqsave(&xhci->lock, flags);
1892	if (!HCD_HW_ACCESSIBLE(hcd)) {
1893		spin_unlock_irqrestore(&xhci->lock, flags);
1894		return -ESHUTDOWN;
1895	}
1896
1897	/* delay the irqs */
1898	temp = readl(&xhci->op_regs->command);
1899	temp &= ~CMD_EIE;
1900	writel(temp, &xhci->op_regs->command);
1901
1902	/* bus specific resume for ports we suspended at bus_suspend */
1903	if (hcd->speed >= HCD_USB3)
1904		next_state = XDEV_U0;
1905	else
1906		next_state = XDEV_RESUME;
1907
1908	port_index = max_ports;
1909	while (port_index--) {
1910		portsc = readl(ports[port_index]->addr);
1911
1912		/* warm reset CAS limited ports stuck in polling/compliance */
1913		if ((xhci->quirks & XHCI_MISSING_CAS) &&
1914		    (hcd->speed >= HCD_USB3) &&
1915		    xhci_port_missing_cas_quirk(ports[port_index])) {
1916			xhci_dbg(xhci, "reset stuck port %d-%d\n",
1917				 hcd->self.busnum, port_index + 1);
1918			clear_bit(port_index, &bus_state->bus_suspended);
1919			continue;
1920		}
1921		/* resume if we suspended the link, and it is still suspended */
1922		if (test_bit(port_index, &bus_state->bus_suspended))
1923			switch (portsc & PORT_PLS_MASK) {
1924			case XDEV_U3:
1925				portsc = xhci_port_state_to_neutral(portsc);
1926				portsc &= ~PORT_PLS_MASK;
1927				portsc |= PORT_LINK_STROBE | next_state;
1928				break;
1929			case XDEV_RESUME:
1930				/* resume already initiated */
1931				break;
1932			default:
1933				/* not in a resumeable state, ignore it */
1934				clear_bit(port_index,
1935					  &bus_state->bus_suspended);
1936				break;
1937			}
1938		/* disable wake for all ports, write new link state if needed */
1939		portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1940		writel(portsc, ports[port_index]->addr);
1941	}
1942
1943	/* USB2 specific resume signaling delay and U0 link state transition */
1944	if (hcd->speed < HCD_USB3) {
1945		if (bus_state->bus_suspended) {
1946			spin_unlock_irqrestore(&xhci->lock, flags);
1947			msleep(USB_RESUME_TIMEOUT);
1948			spin_lock_irqsave(&xhci->lock, flags);
1949		}
1950		for_each_set_bit(port_index, &bus_state->bus_suspended,
1951				 BITS_PER_LONG) {
1952			/* Clear PLC to poll it later for U0 transition */
1953			xhci_test_and_clear_bit(xhci, ports[port_index],
1954						PORT_PLC);
1955			xhci_set_link_state(xhci, ports[port_index], XDEV_U0);
1956		}
1957	}
1958
1959	/* poll for U0 link state complete, both USB2 and USB3 */
1960	for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) {
1961		sret = xhci_handshake(ports[port_index]->addr, PORT_PLC,
1962				      PORT_PLC, 10 * 1000);
1963		if (sret) {
1964			xhci_warn(xhci, "port %d-%d resume PLC timeout\n",
1965				  hcd->self.busnum, port_index + 1);
1966			continue;
1967		}
1968		xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC);
1969		slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1970		if (slot_id)
1971			xhci_ring_device(xhci, slot_id);
1972	}
1973	(void) readl(&xhci->op_regs->command);
1974
1975	bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1976	/* re-enable irqs */
1977	temp = readl(&xhci->op_regs->command);
1978	temp |= CMD_EIE;
1979	writel(temp, &xhci->op_regs->command);
1980	temp = readl(&xhci->op_regs->command);
1981
1982	spin_unlock_irqrestore(&xhci->lock, flags);
1983	return 0;
1984}
1985
1986unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
1987{
1988	struct xhci_hub *rhub = xhci_get_rhub(hcd);
1989
1990	/* USB3 port wakeups are reported via usb_wakeup_notification() */
1991	return rhub->bus_state.resuming_ports;	/* USB2 ports only */
1992}
1993
1994#endif	/* CONFIG_PM */