drivers/usb/host/xhci-hub.c

   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 */
  24 static 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
  35 static 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         }
 245 out:
 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
 255 static 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 */
 278 static 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 */
 333 static 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
 366 static 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
 377 static 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  * Given a port state, this function returns a value that would result in the
 431  * port being in the same state, if the value was written to the port status
 432  * control register.
 433  * Save Read Only (RO) bits and save read/write bits where
 434  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
 435  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
 436  */
 437 u32 xhci_port_state_to_neutral(u32 state)
 438 {
 439         /* Save read-only status and port state */
 440         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 441 }
 442
 443 /*
 444  * find slot id based on port number.
 445  * @port: The one-based port number from one of the two split roothubs.
 446  */
 447 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 448                 u16 port)
 449 {
 450         int slot_id;
 451         int i;
 452         enum usb_device_speed speed;
 453
 454         slot_id = 0;
 455         for (i = 0; i < MAX_HC_SLOTS; i++) {
 456                 if (!xhci->devs[i] || !xhci->devs[i]->udev)
 457                         continue;
 458                 speed = xhci->devs[i]->udev->speed;
 459                 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
 460                                 && xhci->devs[i]->fake_port == port) {
 461                         slot_id = i;
 462                         break;
 463                 }
 464         }
 465
 466         return slot_id;
 467 }
 468
 469 /*
 470  * Stop device
 471  * It issues stop endpoint command for EP 0 to 30. And wait the last command
 472  * to complete.
 473  * suspend will set to 1, if suspend bit need to set in command.
 474  */
 475 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
 476 {
 477         struct xhci_virt_device *virt_dev;
 478         struct xhci_command *cmd;
 479         unsigned long flags;
 480         int ret;
 481         int i;
 482
 483         ret = 0;
 484         virt_dev = xhci->devs[slot_id];
 485         if (!virt_dev)
 486                 return -ENODEV;
 487
 488         trace_xhci_stop_device(virt_dev);
 489
 490         cmd = xhci_alloc_command(xhci, true, GFP_NOIO);
 491         if (!cmd)
 492                 return -ENOMEM;
 493
 494         spin_lock_irqsave(&xhci->lock, flags);
 495         for (i = LAST_EP_INDEX; i > 0; i--) {
 496                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
 497                         struct xhci_ep_ctx *ep_ctx;
 498                         struct xhci_command *command;
 499
 500                         ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->out_ctx, i);
 501
 502                         /* Check ep is running, required by AMD SNPS 3.1 xHC */
 503                         if (GET_EP_CTX_STATE(ep_ctx) != EP_STATE_RUNNING)
 504                                 continue;
 505
 506                         command = xhci_alloc_command(xhci, false, GFP_NOWAIT);
 507                         if (!command) {
 508                                 spin_unlock_irqrestore(&xhci->lock, flags);
 509                                 ret = -ENOMEM;
 510                                 goto cmd_cleanup;
 511                         }
 512
 513                         ret = xhci_queue_stop_endpoint(xhci, command, slot_id,
 514                                                        i, suspend);
 515                         if (ret) {
 516                                 spin_unlock_irqrestore(&xhci->lock, flags);
 517                                 xhci_free_command(xhci, command);
 518                                 goto cmd_cleanup;
 519                         }
 520                 }
 521         }
 522         ret = xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
 523         if (ret) {
 524                 spin_unlock_irqrestore(&xhci->lock, flags);
 525                 goto cmd_cleanup;
 526         }
 527
 528         xhci_ring_cmd_db(xhci);
 529         spin_unlock_irqrestore(&xhci->lock, flags);
 530
 531         /* Wait for last stop endpoint command to finish */
 532         wait_for_completion(cmd->completion);
 533
 534         if (cmd->status == COMP_COMMAND_ABORTED ||
 535             cmd->status == COMP_COMMAND_RING_STOPPED) {
 536                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
 537                 ret = -ETIME;
 538         }
 539
 540 cmd_cleanup:
 541         xhci_free_command(xhci, cmd);
 542         return ret;
 543 }
 544
 545 /*
 546  * Ring device, it rings the all doorbells unconditionally.
 547  */
 548 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 549 {
 550         int i, s;
 551         struct xhci_virt_ep *ep;
 552
 553         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
 554                 ep = &xhci->devs[slot_id]->eps[i];
 555
 556                 if (ep->ep_state & EP_HAS_STREAMS) {
 557                         for (s = 1; s < ep->stream_info->num_streams; s++)
 558                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
 559                 } else if (ep->ring && ep->ring->dequeue) {
 560                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 561                 }
 562         }
 563
 564         return;
 565 }
 566
 567 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 568                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 569 {
 570         /* Don't allow the USB core to disable SuperSpeed ports. */
 571         if (hcd->speed >= HCD_USB3) {
 572                 xhci_dbg(xhci, "Ignoring request to disable "
 573                                 "SuperSpeed port.\n");
 574                 return;
 575         }
 576
 577         if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
 578                 xhci_dbg(xhci,
 579                          "Broken Port Enabled/Disabled, ignoring port disable request.\n");
 580                 return;
 581         }
 582
 583         /* Write 1 to disable the port */
 584         writel(port_status | PORT_PE, addr);
 585         port_status = readl(addr);
 586         xhci_dbg(xhci, "disable port %d-%d, portsc: 0x%x\n",
 587                  hcd->self.busnum, wIndex + 1, port_status);
 588 }
 589
 590 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
 591                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
 592 {
 593         char *port_change_bit;
 594         u32 status;
 595
 596         switch (wValue) {
 597         case USB_PORT_FEAT_C_RESET:
 598                 status = PORT_RC;
 599                 port_change_bit = "reset";
 600                 break;
 601         case USB_PORT_FEAT_C_BH_PORT_RESET:
 602                 status = PORT_WRC;
 603                 port_change_bit = "warm(BH) reset";
 604                 break;
 605         case USB_PORT_FEAT_C_CONNECTION:
 606                 status = PORT_CSC;
 607                 port_change_bit = "connect";
 608                 break;
 609         case USB_PORT_FEAT_C_OVER_CURRENT:
 610                 status = PORT_OCC;
 611                 port_change_bit = "over-current";
 612                 break;
 613         case USB_PORT_FEAT_C_ENABLE:
 614                 status = PORT_PEC;
 615                 port_change_bit = "enable/disable";
 616                 break;
 617         case USB_PORT_FEAT_C_SUSPEND:
 618                 status = PORT_PLC;
 619                 port_change_bit = "suspend/resume";
 620                 break;
 621         case USB_PORT_FEAT_C_PORT_LINK_STATE:
 622                 status = PORT_PLC;
 623                 port_change_bit = "link state";
 624                 break;
 625         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
 626                 status = PORT_CEC;
 627                 port_change_bit = "config error";
 628                 break;
 629         default:
 630                 /* Should never happen */
 631                 return;
 632         }
 633         /* Change bits are all write 1 to clear */
 634         writel(port_status | status, addr);
 635         port_status = readl(addr);
 636
 637         xhci_dbg(xhci, "clear port%d %s change, portsc: 0x%x\n",
 638                  wIndex + 1, port_change_bit, port_status);
 639 }
 640
 641 struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
 642 {
 643         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 644
 645         if (hcd->speed >= HCD_USB3)
 646                 return &xhci->usb3_rhub;
 647         return &xhci->usb2_rhub;
 648 }
 649
 650 /*
 651  * xhci_set_port_power() must be called with xhci->lock held.
 652  * It will release and re-aquire the lock while calling ACPI
 653  * method.
 654  */
 655 void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd,
 656                                 u16 index, bool on, unsigned long *flags)
 657         __must_hold(&xhci->lock)
 658 {
 659         struct xhci_hub *rhub;
 660         struct xhci_port *port;
 661         u32 temp;
 662
 663         rhub = xhci_get_rhub(hcd);
 664         port = rhub->ports[index];
 665         temp = readl(port->addr);
 666
 667         xhci_dbg(xhci, "set port power %d-%d %s, portsc: 0x%x\n",
 668                  hcd->self.busnum, index + 1, on ? "ON" : "OFF", temp);
 669
 670         temp = xhci_port_state_to_neutral(temp);
 671
 672         if (on) {
 673                 /* Power on */
 674                 writel(temp | PORT_POWER, port->addr);
 675                 readl(port->addr);
 676         } else {
 677                 /* Power off */
 678                 writel(temp & ~PORT_POWER, port->addr);
 679         }
 680
 681         spin_unlock_irqrestore(&xhci->lock, *flags);
 682         temp = usb_acpi_power_manageable(hcd->self.root_hub,
 683                                         index);
 684         if (temp)
 685                 usb_acpi_set_power_state(hcd->self.root_hub,
 686                         index, on);
 687         spin_lock_irqsave(&xhci->lock, *flags);
 688 }
 689
 690 static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
 691         u16 test_mode, u16 wIndex)
 692 {
 693         u32 temp;
 694         struct xhci_port *port;
 695
 696         /* xhci only supports test mode for usb2 ports */
 697         port = xhci->usb2_rhub.ports[wIndex];
 698         temp = readl(port->addr + PORTPMSC);
 699         temp |= test_mode << PORT_TEST_MODE_SHIFT;
 700         writel(temp, port->addr + PORTPMSC);
 701         xhci->test_mode = test_mode;
 702         if (test_mode == USB_TEST_FORCE_ENABLE)
 703                 xhci_start(xhci);
 704 }
 705
 706 static int xhci_enter_test_mode(struct xhci_hcd *xhci,
 707                                 u16 test_mode, u16 wIndex, unsigned long *flags)
 708         __must_hold(&xhci->lock)
 709 {
 710         struct usb_hcd *usb3_hcd = xhci_get_usb3_hcd(xhci);
 711         int i, retval;
 712
 713         /* Disable all Device Slots */
 714         xhci_dbg(xhci, "Disable all slots\n");
 715         spin_unlock_irqrestore(&xhci->lock, *flags);
 716         for (i = 1; i <= HCS_MAX_SLOTS(xhci->hcs_params1); i++) {
 717                 if (!xhci->devs[i])
 718                         continue;
 719
 720                 retval = xhci_disable_slot(xhci, i);
 721                 xhci_free_virt_device(xhci, i);
 722                 if (retval)
 723                         xhci_err(xhci, "Failed to disable slot %d, %d. Enter test mode anyway\n",
 724                                  i, retval);
 725         }
 726         spin_lock_irqsave(&xhci->lock, *flags);
 727         /* Put all ports to the Disable state by clear PP */
 728         xhci_dbg(xhci, "Disable all port (PP = 0)\n");
 729         /* Power off USB3 ports*/
 730         for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
 731                 xhci_set_port_power(xhci, usb3_hcd, i, false, flags);
 732         /* Power off USB2 ports*/
 733         for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
 734                 xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags);
 735         /* Stop the controller */
 736         xhci_dbg(xhci, "Stop controller\n");
 737         retval = xhci_halt(xhci);
 738         if (retval)
 739                 return retval;
 740         /* Disable runtime PM for test mode */
 741         pm_runtime_forbid(xhci_to_hcd(xhci)->self.controller);
 742         /* Set PORTPMSC.PTC field to enter selected test mode */
 743         /* Port is selected by wIndex. port_id = wIndex + 1 */
 744         xhci_dbg(xhci, "Enter Test Mode: %d, Port_id=%d\n",
 745                                         test_mode, wIndex + 1);
 746         xhci_port_set_test_mode(xhci, test_mode, wIndex);
 747         return retval;
 748 }
 749
 750 static int xhci_exit_test_mode(struct xhci_hcd *xhci)
 751 {
 752         int retval;
 753
 754         if (!xhci->test_mode) {
 755                 xhci_err(xhci, "Not in test mode, do nothing.\n");
 756                 return 0;
 757         }
 758         if (xhci->test_mode == USB_TEST_FORCE_ENABLE &&
 759                 !(xhci->xhc_state & XHCI_STATE_HALTED)) {
 760                 retval = xhci_halt(xhci);
 761                 if (retval)
 762                         return retval;
 763         }
 764         pm_runtime_allow(xhci_to_hcd(xhci)->self.controller);
 765         xhci->test_mode = 0;
 766         return xhci_reset(xhci, XHCI_RESET_SHORT_USEC);
 767 }
 768
 769 void xhci_set_link_state(struct xhci_hcd *xhci, struct xhci_port *port,
 770                          u32 link_state)
 771 {
 772         u32 temp;
 773         u32 portsc;
 774
 775         portsc = readl(port->addr);
 776         temp = xhci_port_state_to_neutral(portsc);
 777         temp &= ~PORT_PLS_MASK;
 778         temp |= PORT_LINK_STROBE | link_state;
 779         writel(temp, port->addr);
 780
 781         xhci_dbg(xhci, "Set port %d-%d link state, portsc: 0x%x, write 0x%x",
 782                  port->rhub->hcd->self.busnum, port->hcd_portnum + 1,
 783                  portsc, temp);
 784 }
 785
 786 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
 787                                       struct xhci_port *port, u16 wake_mask)
 788 {
 789         u32 temp;
 790
 791         temp = readl(port->addr);
 792         temp = xhci_port_state_to_neutral(temp);
 793
 794         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
 795                 temp |= PORT_WKCONN_E;
 796         else
 797                 temp &= ~PORT_WKCONN_E;
 798
 799         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
 800                 temp |= PORT_WKDISC_E;
 801         else
 802                 temp &= ~PORT_WKDISC_E;
 803
 804         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
 805                 temp |= PORT_WKOC_E;
 806         else
 807                 temp &= ~PORT_WKOC_E;
 808
 809         writel(temp, port->addr);
 810 }
 811
 812 /* Test and clear port RWC bit */
 813 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 814                              u32 port_bit)
 815 {
 816         u32 temp;
 817
 818         temp = readl(port->addr);
 819         if (temp & port_bit) {
 820                 temp = xhci_port_state_to_neutral(temp);
 821                 temp |= port_bit;
 822                 writel(temp, port->addr);
 823         }
 824 }
 825
 826 /* Updates Link Status for super Speed port */
 827 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 828                 u32 *status, u32 status_reg)
 829 {
 830         u32 pls = status_reg & PORT_PLS_MASK;
 831
 832         /* When the CAS bit is set then warm reset
 833          * should be performed on port
 834          */
 835         if (status_reg & PORT_CAS) {
 836                 /* The CAS bit can be set while the port is
 837                  * in any link state.
 838                  * Only roothubs have CAS bit, so we
 839                  * pretend to be in compliance mode
 840                  * unless we're already in compliance
 841                  * or the inactive state.
 842                  */
 843                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
 844                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
 845                         pls = USB_SS_PORT_LS_COMP_MOD;
 846                 }
 847                 /* Return also connection bit -
 848                  * hub state machine resets port
 849                  * when this bit is set.
 850                  */
 851                 pls |= USB_PORT_STAT_CONNECTION;
 852         } else {
 853                 /*
 854                  * Resume state is an xHCI internal state.  Do not report it to
 855                  * usb core, instead, pretend to be U3, thus usb core knows
 856                  * it's not ready for transfer.
 857                  */
 858                 if (pls == XDEV_RESUME) {
 859                         *status |= USB_SS_PORT_LS_U3;
 860                         return;
 861                 }
 862
 863                 /*
 864                  * If CAS bit isn't set but the Port is already at
 865                  * Compliance Mode, fake a connection so the USB core
 866                  * notices the Compliance state and resets the port.
 867                  * This resolves an issue generated by the SN65LVPE502CP
 868                  * in which sometimes the port enters compliance mode
 869                  * caused by a delay on the host-device negotiation.
 870                  */
 871                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 872                                 (pls == USB_SS_PORT_LS_COMP_MOD))
 873                         pls |= USB_PORT_STAT_CONNECTION;
 874         }
 875
 876         /* update status field */
 877         *status |= pls;
 878 }
 879
 880 /*
 881  * Function for Compliance Mode Quirk.
 882  *
 883  * This Function verifies if all xhc USB3 ports have entered U0, if so,
 884  * the compliance mode timer is deleted. A port won't enter
 885  * compliance mode if it has previously entered U0.
 886  */
 887 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
 888                                     u16 wIndex)
 889 {
 890         u32 all_ports_seen_u0 = ((1 << xhci->usb3_rhub.num_ports) - 1);
 891         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
 892
 893         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
 894                 return;
 895
 896         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
 897                 xhci->port_status_u0 |= 1 << wIndex;
 898                 if (xhci->port_status_u0 == all_ports_seen_u0) {
 899                         del_timer_sync(&xhci->comp_mode_recovery_timer);
 900                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 901                                 "All USB3 ports have entered U0 already!");
 902                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 903                                 "Compliance Mode Recovery Timer Deleted.");
 904                 }
 905         }
 906 }
 907
 908 static int xhci_handle_usb2_port_link_resume(struct xhci_port *port,
 909                                              u32 *status, u32 portsc,
 910                                              unsigned long *flags)
 911 {
 912         struct xhci_bus_state *bus_state;
 913         struct xhci_hcd *xhci;
 914         struct usb_hcd *hcd;
 915         int slot_id;
 916         u32 wIndex;
 917
 918         hcd = port->rhub->hcd;
 919         bus_state = &port->rhub->bus_state;
 920         xhci = hcd_to_xhci(hcd);
 921         wIndex = port->hcd_portnum;
 922
 923         if ((portsc & PORT_RESET) || !(portsc & PORT_PE)) {
 924                 *status = 0xffffffff;
 925                 return -EINVAL;
 926         }
 927         /* did port event handler already start resume timing? */
 928         if (!bus_state->resume_done[wIndex]) {
 929                 /* If not, maybe we are in a host initated resume? */
 930                 if (test_bit(wIndex, &bus_state->resuming_ports)) {
 931                         /* Host initated resume doesn't time the resume
 932                          * signalling using resume_done[].
 933                          * It manually sets RESUME state, sleeps 20ms
 934                          * and sets U0 state. This should probably be
 935                          * changed, but not right now.
 936                          */
 937                 } else {
 938                         /* port resume was discovered now and here,
 939                          * start resume timing
 940                          */
 941                         unsigned long timeout = jiffies +
 942                                 msecs_to_jiffies(USB_RESUME_TIMEOUT);
 943
 944                         set_bit(wIndex, &bus_state->resuming_ports);
 945                         bus_state->resume_done[wIndex] = timeout;
 946                         mod_timer(&hcd->rh_timer, timeout);
 947                         usb_hcd_start_port_resume(&hcd->self, wIndex);
 948                 }
 949         /* Has resume been signalled for USB_RESUME_TIME yet? */
 950         } else if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) {
 951                 int time_left;
 952
 953                 xhci_dbg(xhci, "resume USB2 port %d-%d\n",
 954                          hcd->self.busnum, wIndex + 1);
 955
 956                 bus_state->resume_done[wIndex] = 0;
 957                 clear_bit(wIndex, &bus_state->resuming_ports);
 958
 959                 set_bit(wIndex, &bus_state->rexit_ports);
 960
 961                 xhci_test_and_clear_bit(xhci, port, PORT_PLC);
 962                 xhci_set_link_state(xhci, port, XDEV_U0);
 963
 964                 spin_unlock_irqrestore(&xhci->lock, *flags);
 965                 time_left = wait_for_completion_timeout(
 966                         &bus_state->rexit_done[wIndex],
 967                         msecs_to_jiffies(XHCI_MAX_REXIT_TIMEOUT_MS));
 968                 spin_lock_irqsave(&xhci->lock, *flags);
 969
 970                 if (time_left) {
 971                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
 972                                                             wIndex + 1);
 973                         if (!slot_id) {
 974                                 xhci_dbg(xhci, "slot_id is zero\n");
 975                                 *status = 0xffffffff;
 976                                 return -ENODEV;
 977                         }
 978                         xhci_ring_device(xhci, slot_id);
 979                 } else {
 980                         int port_status = readl(port->addr);
 981
 982                         xhci_warn(xhci, "Port resume timed out, port %d-%d: 0x%x\n",
 983                                   hcd->self.busnum, wIndex + 1, port_status);
 984                         *status |= USB_PORT_STAT_SUSPEND;
 985                         clear_bit(wIndex, &bus_state->rexit_ports);
 986                 }
 987
 988                 usb_hcd_end_port_resume(&hcd->self, wIndex);
 989                 bus_state->port_c_suspend |= 1 << wIndex;
 990                 bus_state->suspended_ports &= ~(1 << wIndex);
 991         } else {
 992                 /*
 993                  * The resume has been signaling for less than
 994                  * USB_RESUME_TIME. Report the port status as SUSPEND,
 995                  * let the usbcore check port status again and clear
 996                  * resume signaling later.
 997                  */
 998                 *status |= USB_PORT_STAT_SUSPEND;
 999         }
1000         return 0;
1001 }
1002
1003 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
1004 {
1005         u32 ext_stat = 0;
1006         int speed_id;
1007
1008         /* only support rx and tx lane counts of 1 in usb3.1 spec */
1009         speed_id = DEV_PORT_SPEED(raw_port_status);
1010         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
1011         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
1012
1013         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
1014         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
1015
1016         return ext_stat;
1017 }
1018
1019 static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
1020                                       u32 portsc)
1021 {
1022         struct xhci_bus_state *bus_state;
1023         struct xhci_hcd *xhci;
1024         struct usb_hcd *hcd;
1025         u32 link_state;
1026         u32 portnum;
1027
1028         bus_state = &port->rhub->bus_state;
1029         xhci = hcd_to_xhci(port->rhub->hcd);
1030         hcd = port->rhub->hcd;
1031         link_state = portsc & PORT_PLS_MASK;
1032         portnum = port->hcd_portnum;
1033
1034         /* USB3 specific wPortChange bits
1035          *
1036          * Port link change with port in resume state should not be
1037          * reported to usbcore, as this is an internal state to be
1038          * handled by xhci driver. Reporting PLC to usbcore may
1039          * cause usbcore clearing PLC first and port change event
1040          * irq won't be generated.
1041          */
1042
1043         if (portsc & PORT_PLC && (link_state != XDEV_RESUME))
1044                 *status |= USB_PORT_STAT_C_LINK_STATE << 16;
1045         if (portsc & PORT_WRC)
1046                 *status |= USB_PORT_STAT_C_BH_RESET << 16;
1047         if (portsc & PORT_CEC)
1048                 *status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
1049
1050         /* USB3 specific wPortStatus bits */
1051         if (portsc & PORT_POWER) {
1052                 *status |= USB_SS_PORT_STAT_POWER;
1053                 /* link state handling */
1054                 if (link_state == XDEV_U0)
1055                         bus_state->suspended_ports &= ~(1 << portnum);
1056         }
1057
1058         /* remote wake resume signaling complete */
1059         if (bus_state->port_remote_wakeup & (1 << portnum) &&
1060             link_state != XDEV_RESUME &&
1061             link_state != XDEV_RECOVERY) {
1062                 bus_state->port_remote_wakeup &= ~(1 << portnum);
1063                 usb_hcd_end_port_resume(&hcd->self, portnum);
1064         }
1065
1066         xhci_hub_report_usb3_link_state(xhci, status, portsc);
1067         xhci_del_comp_mod_timer(xhci, portsc, portnum);
1068 }
1069
1070 static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
1071                                       u32 portsc, unsigned long *flags)
1072 {
1073         struct xhci_bus_state *bus_state;
1074         u32 link_state;
1075         u32 portnum;
1076         int ret;
1077
1078         bus_state = &port->rhub->bus_state;
1079         link_state = portsc & PORT_PLS_MASK;
1080         portnum = port->hcd_portnum;
1081
1082         /* USB2 wPortStatus bits */
1083         if (portsc & PORT_POWER) {
1084                 *status |= USB_PORT_STAT_POWER;
1085
1086                 /* link state is only valid if port is powered */
1087                 if (link_state == XDEV_U3)
1088                         *status |= USB_PORT_STAT_SUSPEND;
1089                 if (link_state == XDEV_U2)
1090                         *status |= USB_PORT_STAT_L1;
1091                 if (link_state == XDEV_U0) {
1092                         if (bus_state->resume_done[portnum])
1093                                 usb_hcd_end_port_resume(&port->rhub->hcd->self,
1094                                                         portnum);
1095                         bus_state->resume_done[portnum] = 0;
1096                         clear_bit(portnum, &bus_state->resuming_ports);
1097                         if (bus_state->suspended_ports & (1 << portnum)) {
1098                                 bus_state->suspended_ports &= ~(1 << portnum);
1099                                 bus_state->port_c_suspend |= 1 << portnum;
1100                         }
1101                 }
1102                 if (link_state == XDEV_RESUME) {
1103                         ret = xhci_handle_usb2_port_link_resume(port, status,
1104                                                                 portsc, flags);
1105                         if (ret)
1106                                 return;
1107                 }
1108         }
1109 }
1110
1111 /*
1112  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
1113  * 3.0 hubs use.
1114  *
1115  * Possible side effects:
1116  *  - Mark a port as being done with device resume,
1117  *    and ring the endpoint doorbells.
1118  *  - Stop the Synopsys redriver Compliance Mode polling.
1119  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
1120  */
1121 static u32 xhci_get_port_status(struct usb_hcd *hcd,
1122                 struct xhci_bus_state *bus_state,
1123         u16 wIndex, u32 raw_port_status,
1124                 unsigned long *flags)
1125         __releases(&xhci->lock)
1126         __acquires(&xhci->lock)
1127 {
1128         u32 status = 0;
1129         struct xhci_hub *rhub;
1130         struct xhci_port *port;
1131
1132         rhub = xhci_get_rhub(hcd);
1133         port = rhub->ports[wIndex];
1134
1135         /* common wPortChange bits */
1136         if (raw_port_status & PORT_CSC)
1137                 status |= USB_PORT_STAT_C_CONNECTION << 16;
1138         if (raw_port_status & PORT_PEC)
1139                 status |= USB_PORT_STAT_C_ENABLE << 16;
1140         if ((raw_port_status & PORT_OCC))
1141                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1142         if ((raw_port_status & PORT_RC))
1143                 status |= USB_PORT_STAT_C_RESET << 16;
1144
1145         /* common wPortStatus bits */
1146         if (raw_port_status & PORT_CONNECT) {
1147                 status |= USB_PORT_STAT_CONNECTION;
1148                 status |= xhci_port_speed(raw_port_status);
1149         }
1150         if (raw_port_status & PORT_PE)
1151                 status |= USB_PORT_STAT_ENABLE;
1152         if (raw_port_status & PORT_OC)
1153                 status |= USB_PORT_STAT_OVERCURRENT;
1154         if (raw_port_status & PORT_RESET)
1155                 status |= USB_PORT_STAT_RESET;
1156
1157         /* USB2 and USB3 specific bits, including Port Link State */
1158         if (hcd->speed >= HCD_USB3)
1159                 xhci_get_usb3_port_status(port, &status, raw_port_status);
1160         else
1161                 xhci_get_usb2_port_status(port, &status, raw_port_status,
1162                                           flags);
1163         /*
1164          * Clear stale usb2 resume signalling variables in case port changed
1165          * state during resume signalling. For example on error
1166          */
1167         if ((bus_state->resume_done[wIndex] ||
1168              test_bit(wIndex, &bus_state->resuming_ports)) &&
1169             (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
1170             (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
1171                 bus_state->resume_done[wIndex] = 0;
1172                 clear_bit(wIndex, &bus_state->resuming_ports);
1173                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1174         }
1175
1176         if (bus_state->port_c_suspend & (1 << wIndex))
1177                 status |= USB_PORT_STAT_C_SUSPEND << 16;
1178
1179         return status;
1180 }
1181
1182 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
1183                 u16 wIndex, char *buf, u16 wLength)
1184 {
1185         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1186         int max_ports;
1187         unsigned long flags;
1188         u32 temp, status;
1189         int retval = 0;
1190         int slot_id;
1191         struct xhci_bus_state *bus_state;
1192         u16 link_state = 0;
1193         u16 wake_mask = 0;
1194         u16 timeout = 0;
1195         u16 test_mode = 0;
1196         struct xhci_hub *rhub;
1197         struct xhci_port **ports;
1198
1199         rhub = xhci_get_rhub(hcd);
1200         ports = rhub->ports;
1201         max_ports = rhub->num_ports;
1202         bus_state = &rhub->bus_state;
1203
1204         spin_lock_irqsave(&xhci->lock, flags);
1205         switch (typeReq) {
1206         case GetHubStatus:
1207                 /* No power source, over-current reported per port */
1208                 memset(buf, 0, 4);
1209                 break;
1210         case GetHubDescriptor:
1211                 /* Check to make sure userspace is asking for the USB 3.0 hub
1212                  * descriptor for the USB 3.0 roothub.  If not, we stall the
1213                  * endpoint, like external hubs do.
1214                  */
1215                 if (hcd->speed >= HCD_USB3 &&
1216                                 (wLength < USB_DT_SS_HUB_SIZE ||
1217                                  wValue != (USB_DT_SS_HUB << 8))) {
1218                         xhci_dbg(xhci, "Wrong hub descriptor type for "
1219                                         "USB 3.0 roothub.\n");
1220                         goto error;
1221                 }
1222                 xhci_hub_descriptor(hcd, xhci,
1223                                 (struct usb_hub_descriptor *) buf);
1224                 break;
1225         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
1226                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
1227                         goto error;
1228
1229                 if (hcd->speed < HCD_USB3)
1230                         goto error;
1231
1232                 retval = xhci_create_usb3x_bos_desc(xhci, buf, wLength);
1233                 spin_unlock_irqrestore(&xhci->lock, flags);
1234                 return retval;
1235         case GetPortStatus:
1236                 if (!wIndex || wIndex > max_ports)
1237                         goto error;
1238                 wIndex--;
1239                 temp = readl(ports[wIndex]->addr);
1240                 if (temp == ~(u32)0) {
1241                         xhci_hc_died(xhci);
1242                         retval = -ENODEV;
1243                         break;
1244                 }
1245                 trace_xhci_get_port_status(wIndex, temp);
1246                 status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
1247                                               &flags);
1248                 if (status == 0xffffffff)
1249                         goto error;
1250
1251                 xhci_dbg(xhci, "Get port status %d-%d read: 0x%x, return 0x%x",
1252                          hcd->self.busnum, wIndex + 1, temp, status);
1253
1254                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
1255                 /* if USB 3.1 extended port status return additional 4 bytes */
1256                 if (wValue == 0x02) {
1257                         u32 port_li;
1258
1259                         if (hcd->speed < HCD_USB31 || wLength != 8) {
1260                                 xhci_err(xhci, "get ext port status invalid parameter\n");
1261                                 retval = -EINVAL;
1262                                 break;
1263                         }
1264                         port_li = readl(ports[wIndex]->addr + PORTLI);
1265                         status = xhci_get_ext_port_status(temp, port_li);
1266                         put_unaligned_le32(status, &buf[4]);
1267                 }
1268                 break;
1269         case SetPortFeature:
1270                 if (wValue == USB_PORT_FEAT_LINK_STATE)
1271                         link_state = (wIndex & 0xff00) >> 3;
1272                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
1273                         wake_mask = wIndex & 0xff00;
1274                 if (wValue == USB_PORT_FEAT_TEST)
1275                         test_mode = (wIndex & 0xff00) >> 8;
1276                 /* The MSB of wIndex is the U1/U2 timeout */
1277                 timeout = (wIndex & 0xff00) >> 8;
1278                 wIndex &= 0xff;
1279                 if (!wIndex || wIndex > max_ports)
1280                         goto error;
1281                 wIndex--;
1282                 temp = readl(ports[wIndex]->addr);
1283                 if (temp == ~(u32)0) {
1284                         xhci_hc_died(xhci);
1285                         retval = -ENODEV;
1286                         break;
1287                 }
1288                 temp = xhci_port_state_to_neutral(temp);
1289                 /* FIXME: What new port features do we need to support? */
1290                 switch (wValue) {
1291                 case USB_PORT_FEAT_SUSPEND:
1292                         temp = readl(ports[wIndex]->addr);
1293                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
1294                                 /* Resume the port to U0 first */
1295                                 xhci_set_link_state(xhci, ports[wIndex],
1296                                                         XDEV_U0);
1297                                 spin_unlock_irqrestore(&xhci->lock, flags);
1298                                 msleep(10);
1299                                 spin_lock_irqsave(&xhci->lock, flags);
1300                         }
1301                         /* In spec software should not attempt to suspend
1302                          * a port unless the port reports that it is in the
1303                          * enabled (PED = ‘1’,PLS < ‘3’) state.
1304                          */
1305                         temp = readl(ports[wIndex]->addr);
1306                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1307                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
1308                                 xhci_warn(xhci, "USB core suspending port %d-%d not in U0/U1/U2\n",
1309                                           hcd->self.busnum, wIndex + 1);
1310                                 goto error;
1311                         }
1312
1313                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1314                                         wIndex + 1);
1315                         if (!slot_id) {
1316                                 xhci_warn(xhci, "slot_id is zero\n");
1317                                 goto error;
1318                         }
1319                         /* unlock to execute stop endpoint commands */
1320                         spin_unlock_irqrestore(&xhci->lock, flags);
1321                         xhci_stop_device(xhci, slot_id, 1);
1322                         spin_lock_irqsave(&xhci->lock, flags);
1323
1324                         xhci_set_link_state(xhci, ports[wIndex], XDEV_U3);
1325
1326                         spin_unlock_irqrestore(&xhci->lock, flags);
1327                         msleep(10); /* wait device to enter */
1328                         spin_lock_irqsave(&xhci->lock, flags);
1329
1330                         temp = readl(ports[wIndex]->addr);
1331                         bus_state->suspended_ports |= 1 << wIndex;
1332                         break;
1333                 case USB_PORT_FEAT_LINK_STATE:
1334                         temp = readl(ports[wIndex]->addr);
1335                         /* Disable port */
1336                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1337                                 xhci_dbg(xhci, "Disable port %d-%d\n",
1338                                          hcd->self.busnum, wIndex + 1);
1339                                 temp = xhci_port_state_to_neutral(temp);
1340                                 /*
1341                                  * Clear all change bits, so that we get a new
1342                                  * connection event.
1343                                  */
1344                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1345                                         PORT_OCC | PORT_RC | PORT_PLC |
1346                                         PORT_CEC;
1347                                 writel(temp | PORT_PE, ports[wIndex]->addr);
1348                                 temp = readl(ports[wIndex]->addr);
1349                                 break;
1350                         }
1351
1352                         /* Put link in RxDetect (enable port) */
1353                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1354                                 xhci_dbg(xhci, "Enable port %d-%d\n",
1355                                          hcd->self.busnum, wIndex + 1);
1356                                 xhci_set_link_state(xhci, ports[wIndex],
1357                                                         link_state);
1358                                 temp = readl(ports[wIndex]->addr);
1359                                 break;
1360                         }
1361
1362                         /*
1363                          * For xHCI 1.1 according to section 4.19.1.2.4.1 a
1364                          * root hub port's transition to compliance mode upon
1365                          * detecting LFPS timeout may be controlled by an
1366                          * Compliance Transition Enabled (CTE) flag (not
1367                          * software visible). This flag is set by writing 0xA
1368                          * to PORTSC PLS field which will allow transition to
1369                          * compliance mode the next time LFPS timeout is
1370                          * encountered. A warm reset will clear it.
1371                          *
1372                          * The CTE flag is only supported if the HCCPARAMS2 CTC
1373                          * flag is set, otherwise, the compliance substate is
1374                          * automatically entered as on 1.0 and prior.
1375                          */
1376                         if (link_state == USB_SS_PORT_LS_COMP_MOD) {
1377                                 if (!HCC2_CTC(xhci->hcc_params2)) {
1378                                         xhci_dbg(xhci, "CTC flag is 0, port already supports entering compliance mode\n");
1379                                         break;
1380                                 }
1381
1382                                 if ((temp & PORT_CONNECT)) {
1383                                         xhci_warn(xhci, "Can't set compliance mode when port is connected\n");
1384                                         goto error;
1385                                 }
1386
1387                                 xhci_dbg(xhci, "Enable compliance mode transition for port %d-%d\n",
1388                                          hcd->self.busnum, wIndex + 1);
1389                                 xhci_set_link_state(xhci, ports[wIndex],
1390                                                 link_state);
1391
1392                                 temp = readl(ports[wIndex]->addr);
1393                                 break;
1394                         }
1395                         /* Port must be enabled */
1396                         if (!(temp & PORT_PE)) {
1397                                 retval = -ENODEV;
1398                                 break;
1399                         }
1400                         /* Can't set port link state above '3' (U3) */
1401                         if (link_state > USB_SS_PORT_LS_U3) {
1402                                 xhci_warn(xhci, "Cannot set port %d-%d link state %d\n",
1403                                           hcd->self.busnum, wIndex + 1,
1404                                           link_state);
1405                                 goto error;
1406                         }
1407
1408                         /*
1409                          * set link to U0, steps depend on current link state.
1410                          * U3: set link to U0 and wait for u3exit completion.
1411                          * U1/U2:  no PLC complete event, only set link to U0.
1412                          * Resume/Recovery: device initiated U0, only wait for
1413                          * completion
1414                          */
1415                         if (link_state == USB_SS_PORT_LS_U0) {
1416                                 u32 pls = temp & PORT_PLS_MASK;
1417                                 bool wait_u0 = false;
1418
1419                                 /* already in U0 */
1420                                 if (pls == XDEV_U0)
1421                                         break;
1422                                 if (pls == XDEV_U3 ||
1423                                     pls == XDEV_RESUME ||
1424                                     pls == XDEV_RECOVERY) {
1425                                         wait_u0 = true;
1426                                         reinit_completion(&bus_state->u3exit_done[wIndex]);
1427                                 }
1428                                 if (pls <= XDEV_U3) /* U1, U2, U3 */
1429                                         xhci_set_link_state(xhci, ports[wIndex],
1430                                                             USB_SS_PORT_LS_U0);
1431                                 if (!wait_u0) {
1432                                         if (pls > XDEV_U3)
1433                                                 goto error;
1434                                         break;
1435                                 }
1436                                 spin_unlock_irqrestore(&xhci->lock, flags);
1437                                 if (!wait_for_completion_timeout(&bus_state->u3exit_done[wIndex],
1438                                                                  msecs_to_jiffies(500)))
1439                                         xhci_dbg(xhci, "missing U0 port change event for port %d-%d\n",
1440                                                  hcd->self.busnum, wIndex + 1);
1441                                 spin_lock_irqsave(&xhci->lock, flags);
1442                                 temp = readl(ports[wIndex]->addr);
1443                                 break;
1444                         }
1445
1446                         if (link_state == USB_SS_PORT_LS_U3) {
1447                                 int retries = 16;
1448                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1449                                                 wIndex + 1);
1450                                 if (slot_id) {
1451                                         /* unlock to execute stop endpoint
1452                                          * commands */
1453                                         spin_unlock_irqrestore(&xhci->lock,
1454                                                                 flags);
1455                                         xhci_stop_device(xhci, slot_id, 1);
1456                                         spin_lock_irqsave(&xhci->lock, flags);
1457                                 }
1458                                 xhci_set_link_state(xhci, ports[wIndex], USB_SS_PORT_LS_U3);
1459                                 spin_unlock_irqrestore(&xhci->lock, flags);
1460                                 while (retries--) {
1461                                         usleep_range(4000, 8000);
1462                                         temp = readl(ports[wIndex]->addr);
1463                                         if ((temp & PORT_PLS_MASK) == XDEV_U3)
1464                                                 break;
1465                                 }
1466                                 spin_lock_irqsave(&xhci->lock, flags);
1467                                 temp = readl(ports[wIndex]->addr);
1468                                 bus_state->suspended_ports |= 1 << wIndex;
1469                         }
1470                         break;
1471                 case USB_PORT_FEAT_POWER:
1472                         /*
1473                          * Turn on ports, even if there isn't per-port switching.
1474                          * HC will report connect events even before this is set.
1475                          * However, hub_wq will ignore the roothub events until
1476                          * the roothub is registered.
1477                          */
1478                         xhci_set_port_power(xhci, hcd, wIndex, true, &flags);
1479                         break;
1480                 case USB_PORT_FEAT_RESET:
1481                         temp = (temp | PORT_RESET);
1482                         writel(temp, ports[wIndex]->addr);
1483
1484                         temp = readl(ports[wIndex]->addr);
1485                         xhci_dbg(xhci, "set port reset, actual port %d-%d status  = 0x%x\n",
1486                                  hcd->self.busnum, wIndex + 1, temp);
1487                         break;
1488                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1489                         xhci_set_remote_wake_mask(xhci, ports[wIndex],
1490                                                   wake_mask);
1491                         temp = readl(ports[wIndex]->addr);
1492                         xhci_dbg(xhci, "set port remote wake mask, actual port %d-%d status  = 0x%x\n",
1493                                  hcd->self.busnum, wIndex + 1, temp);
1494                         break;
1495                 case USB_PORT_FEAT_BH_PORT_RESET:
1496                         temp |= PORT_WR;
1497                         writel(temp, ports[wIndex]->addr);
1498                         temp = readl(ports[wIndex]->addr);
1499                         break;
1500                 case USB_PORT_FEAT_U1_TIMEOUT:
1501                         if (hcd->speed < HCD_USB3)
1502                                 goto error;
1503                         temp = readl(ports[wIndex]->addr + PORTPMSC);
1504                         temp &= ~PORT_U1_TIMEOUT_MASK;
1505                         temp |= PORT_U1_TIMEOUT(timeout);
1506                         writel(temp, ports[wIndex]->addr + PORTPMSC);
1507                         break;
1508                 case USB_PORT_FEAT_U2_TIMEOUT:
1509                         if (hcd->speed < HCD_USB3)
1510                                 goto error;
1511                         temp = readl(ports[wIndex]->addr + PORTPMSC);
1512                         temp &= ~PORT_U2_TIMEOUT_MASK;
1513                         temp |= PORT_U2_TIMEOUT(timeout);
1514                         writel(temp, ports[wIndex]->addr + PORTPMSC);
1515                         break;
1516                 case USB_PORT_FEAT_TEST:
1517                         /* 4.19.6 Port Test Modes (USB2 Test Mode) */
1518                         if (hcd->speed != HCD_USB2)
1519                                 goto error;
1520                         if (test_mode > USB_TEST_FORCE_ENABLE ||
1521                             test_mode < USB_TEST_J)
1522                                 goto error;
1523                         retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
1524                                                       &flags);
1525                         break;
1526                 default:
1527                         goto error;
1528                 }
1529                 /* unblock any posted writes */
1530                 temp = readl(ports[wIndex]->addr);
1531                 break;
1532         case ClearPortFeature:
1533                 if (!wIndex || wIndex > max_ports)
1534                         goto error;
1535                 wIndex--;
1536                 temp = readl(ports[wIndex]->addr);
1537                 if (temp == ~(u32)0) {
1538                         xhci_hc_died(xhci);
1539                         retval = -ENODEV;
1540                         break;
1541                 }
1542                 /* FIXME: What new port features do we need to support? */
1543                 temp = xhci_port_state_to_neutral(temp);
1544                 switch (wValue) {
1545                 case USB_PORT_FEAT_SUSPEND:
1546                         temp = readl(ports[wIndex]->addr);
1547                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1548                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1549                         if (temp & PORT_RESET)
1550                                 goto error;
1551                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1552                                 if ((temp & PORT_PE) == 0)
1553                                         goto error;
1554
1555                                 set_bit(wIndex, &bus_state->resuming_ports);
1556                                 usb_hcd_start_port_resume(&hcd->self, wIndex);
1557                                 xhci_set_link_state(xhci, ports[wIndex],
1558                                                     XDEV_RESUME);
1559                                 spin_unlock_irqrestore(&xhci->lock, flags);
1560                                 msleep(USB_RESUME_TIMEOUT);
1561                                 spin_lock_irqsave(&xhci->lock, flags);
1562                                 xhci_set_link_state(xhci, ports[wIndex],
1563                                                         XDEV_U0);
1564                                 clear_bit(wIndex, &bus_state->resuming_ports);
1565                                 usb_hcd_end_port_resume(&hcd->self, wIndex);
1566                         }
1567                         bus_state->port_c_suspend |= 1 << wIndex;
1568
1569                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1570                                         wIndex + 1);
1571                         if (!slot_id) {
1572                                 xhci_dbg(xhci, "slot_id is zero\n");
1573                                 goto error;
1574                         }
1575                         xhci_ring_device(xhci, slot_id);
1576                         break;
1577                 case USB_PORT_FEAT_C_SUSPEND:
1578                         bus_state->port_c_suspend &= ~(1 << wIndex);
1579                         fallthrough;
1580                 case USB_PORT_FEAT_C_RESET:
1581                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1582                 case USB_PORT_FEAT_C_CONNECTION:
1583                 case USB_PORT_FEAT_C_OVER_CURRENT:
1584                 case USB_PORT_FEAT_C_ENABLE:
1585                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1586                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1587                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1588                                         ports[wIndex]->addr, temp);
1589                         break;
1590                 case USB_PORT_FEAT_ENABLE:
1591                         xhci_disable_port(hcd, xhci, wIndex,
1592                                         ports[wIndex]->addr, temp);
1593                         break;
1594                 case USB_PORT_FEAT_POWER:
1595                         xhci_set_port_power(xhci, hcd, wIndex, false, &flags);
1596                         break;
1597                 case USB_PORT_FEAT_TEST:
1598                         retval = xhci_exit_test_mode(xhci);
1599                         break;
1600                 default:
1601                         goto error;
1602                 }
1603                 break;
1604         default:
1605 error:
1606                 /* "stall" on error */
1607                 retval = -EPIPE;
1608         }
1609         spin_unlock_irqrestore(&xhci->lock, flags);
1610         return retval;
1611 }
1612
1613 /*
1614  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1615  * Ports are 0-indexed from the HCD point of view,
1616  * and 1-indexed from the USB core pointer of view.
1617  *
1618  * Note that the status change bits will be cleared as soon as a port status
1619  * change event is generated, so we use the saved status from that event.
1620  */
1621 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1622 {
1623         unsigned long flags;
1624         u32 temp, status;
1625         u32 mask;
1626         int i, retval;
1627         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1628         int max_ports;
1629         struct xhci_bus_state *bus_state;
1630         bool reset_change = false;
1631         struct xhci_hub *rhub;
1632         struct xhci_port **ports;
1633
1634         rhub = xhci_get_rhub(hcd);
1635         ports = rhub->ports;
1636         max_ports = rhub->num_ports;
1637         bus_state = &rhub->bus_state;
1638
1639         /* Initial status is no changes */
1640         retval = (max_ports + 8) / 8;
1641         memset(buf, 0, retval);
1642
1643         /*
1644          * Inform the usbcore about resume-in-progress by returning
1645          * a non-zero value even if there are no status changes.
1646          */
1647         spin_lock_irqsave(&xhci->lock, flags);
1648
1649         status = bus_state->resuming_ports;
1650
1651         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1652
1653         /* For each port, did anything change?  If so, set that bit in buf. */
1654         for (i = 0; i < max_ports; i++) {
1655                 temp = readl(ports[i]->addr);
1656                 if (temp == ~(u32)0) {
1657                         xhci_hc_died(xhci);
1658                         retval = -ENODEV;
1659                         break;
1660                 }
1661                 trace_xhci_hub_status_data(i, temp);
1662
1663                 if ((temp & mask) != 0 ||
1664                         (bus_state->port_c_suspend & 1 << i) ||
1665                         (bus_state->resume_done[i] && time_after_eq(
1666                             jiffies, bus_state->resume_done[i]))) {
1667                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1668                         status = 1;
1669                 }
1670                 if ((temp & PORT_RC))
1671                         reset_change = true;
1672                 if (temp & PORT_OC)
1673                         status = 1;
1674         }
1675         if (!status && !reset_change) {
1676                 xhci_dbg(xhci, "%s: stopping usb%d port polling\n",
1677                          __func__, hcd->self.busnum);
1678                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1679         }
1680         spin_unlock_irqrestore(&xhci->lock, flags);
1681         return status ? retval : 0;
1682 }
1683
1684 #ifdef CONFIG_PM
1685
1686 int xhci_bus_suspend(struct usb_hcd *hcd)
1687 {
1688         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1689         int max_ports, port_index;
1690         struct xhci_bus_state *bus_state;
1691         unsigned long flags;
1692         struct xhci_hub *rhub;
1693         struct xhci_port **ports;
1694         u32 portsc_buf[USB_MAXCHILDREN];
1695         bool wake_enabled;
1696
1697         rhub = xhci_get_rhub(hcd);
1698         ports = rhub->ports;
1699         max_ports = rhub->num_ports;
1700         bus_state = &rhub->bus_state;
1701         wake_enabled = hcd->self.root_hub->do_remote_wakeup;
1702
1703         spin_lock_irqsave(&xhci->lock, flags);
1704
1705         if (wake_enabled) {
1706                 if (bus_state->resuming_ports ||        /* USB2 */
1707                     bus_state->port_remote_wakeup) {    /* USB3 */
1708                         spin_unlock_irqrestore(&xhci->lock, flags);
1709                         xhci_dbg(xhci, "usb%d bus suspend to fail because a port is resuming\n",
1710                                  hcd->self.busnum);
1711                         return -EBUSY;
1712                 }
1713         }
1714         /*
1715          * Prepare ports for suspend, but don't write anything before all ports
1716          * are checked and we know bus suspend can proceed
1717          */
1718         bus_state->bus_suspended = 0;
1719         port_index = max_ports;
1720         while (port_index--) {
1721                 u32 t1, t2;
1722                 int retries = 10;
1723 retry:
1724                 t1 = readl(ports[port_index]->addr);
1725                 t2 = xhci_port_state_to_neutral(t1);
1726                 portsc_buf[port_index] = 0;
1727
1728                 /*
1729                  * Give a USB3 port in link training time to finish, but don't
1730                  * prevent suspend as port might be stuck
1731                  */
1732                 if ((hcd->speed >= HCD_USB3) && retries-- &&
1733                     (t1 & PORT_PLS_MASK) == XDEV_POLLING) {
1734                         spin_unlock_irqrestore(&xhci->lock, flags);
1735                         msleep(XHCI_PORT_POLLING_LFPS_TIME);
1736                         spin_lock_irqsave(&xhci->lock, flags);
1737                         xhci_dbg(xhci, "port %d-%d polling in bus suspend, waiting\n",
1738                                  hcd->self.busnum, port_index + 1);
1739                         goto retry;
1740                 }
1741                 /* bail out if port detected a over-current condition */
1742                 if (t1 & PORT_OC) {
1743                         bus_state->bus_suspended = 0;
1744                         spin_unlock_irqrestore(&xhci->lock, flags);
1745                         xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n");
1746                         return -EBUSY;
1747                 }
1748                 /* suspend ports in U0, or bail out for new connect changes */
1749                 if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
1750                         if ((t1 & PORT_CSC) && wake_enabled) {
1751                                 bus_state->bus_suspended = 0;
1752                                 spin_unlock_irqrestore(&xhci->lock, flags);
1753                                 xhci_dbg(xhci, "Bus suspend bailout, port connect change\n");
1754                                 return -EBUSY;
1755                         }
1756                         xhci_dbg(xhci, "port %d-%d not suspended\n",
1757                                  hcd->self.busnum, port_index + 1);
1758                         t2 &= ~PORT_PLS_MASK;
1759                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1760                         set_bit(port_index, &bus_state->bus_suspended);
1761                 }
1762                 /* USB core sets remote wake mask for USB 3.0 hubs,
1763                  * including the USB 3.0 roothub, but only if CONFIG_PM
1764                  * is enabled, so also enable remote wake here.
1765                  */
1766                 if (wake_enabled) {
1767                         if (t1 & PORT_CONNECT) {
1768                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1769                                 t2 &= ~PORT_WKCONN_E;
1770                         } else {
1771                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1772                                 t2 &= ~PORT_WKDISC_E;
1773                         }
1774
1775                         if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
1776                             (hcd->speed < HCD_USB3)) {
1777                                 if (usb_amd_pt_check_port(hcd->self.controller,
1778                                                           port_index))
1779                                         t2 &= ~PORT_WAKE_BITS;
1780                         }
1781                 } else
1782                         t2 &= ~PORT_WAKE_BITS;
1783
1784                 t1 = xhci_port_state_to_neutral(t1);
1785                 if (t1 != t2)
1786                         portsc_buf[port_index] = t2;
1787         }
1788
1789         /* write port settings, stopping and suspending ports if needed */
1790         port_index = max_ports;
1791         while (port_index--) {
1792                 if (!portsc_buf[port_index])
1793                         continue;
1794                 if (test_bit(port_index, &bus_state->bus_suspended)) {
1795                         int slot_id;
1796
1797                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1798                                                             port_index + 1);
1799                         if (slot_id) {
1800                                 spin_unlock_irqrestore(&xhci->lock, flags);
1801                                 xhci_stop_device(xhci, slot_id, 1);
1802                                 spin_lock_irqsave(&xhci->lock, flags);
1803                         }
1804                 }
1805                 writel(portsc_buf[port_index], ports[port_index]->addr);
1806         }
1807         hcd->state = HC_STATE_SUSPENDED;
1808         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1809         spin_unlock_irqrestore(&xhci->lock, flags);
1810
1811         if (bus_state->bus_suspended)
1812                 usleep_range(5000, 10000);
1813
1814         return 0;
1815 }
1816
1817 /*
1818  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1819  * warm reset a USB3 device stuck in polling or compliance mode after resume.
1820  * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1821  */
1822 static bool xhci_port_missing_cas_quirk(struct xhci_port *port)
1823 {
1824         u32 portsc;
1825
1826         portsc = readl(port->addr);
1827
1828         /* if any of these are set we are not stuck */
1829         if (portsc & (PORT_CONNECT | PORT_CAS))
1830                 return false;
1831
1832         if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1833             ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1834                 return false;
1835
1836         /* clear wakeup/change bits, and do a warm port reset */
1837         portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1838         portsc |= PORT_WR;
1839         writel(portsc, port->addr);
1840         /* flush write */
1841         readl(port->addr);
1842         return true;
1843 }
1844
1845 int xhci_bus_resume(struct usb_hcd *hcd)
1846 {
1847         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1848         struct xhci_bus_state *bus_state;
1849         unsigned long flags;
1850         int max_ports, port_index;
1851         int slot_id;
1852         int sret;
1853         u32 next_state;
1854         u32 temp, portsc;
1855         struct xhci_hub *rhub;
1856         struct xhci_port **ports;
1857
1858         rhub = xhci_get_rhub(hcd);
1859         ports = rhub->ports;
1860         max_ports = rhub->num_ports;
1861         bus_state = &rhub->bus_state;
1862
1863         if (time_before(jiffies, bus_state->next_statechange))
1864                 msleep(5);
1865
1866         spin_lock_irqsave(&xhci->lock, flags);
1867         if (!HCD_HW_ACCESSIBLE(hcd)) {
1868                 spin_unlock_irqrestore(&xhci->lock, flags);
1869                 return -ESHUTDOWN;
1870         }
1871
1872         /* delay the irqs */
1873         temp = readl(&xhci->op_regs->command);
1874         temp &= ~CMD_EIE;
1875         writel(temp, &xhci->op_regs->command);
1876
1877         /* bus specific resume for ports we suspended at bus_suspend */
1878         if (hcd->speed >= HCD_USB3)
1879                 next_state = XDEV_U0;
1880         else
1881                 next_state = XDEV_RESUME;
1882
1883         port_index = max_ports;
1884         while (port_index--) {
1885                 portsc = readl(ports[port_index]->addr);
1886
1887                 /* warm reset CAS limited ports stuck in polling/compliance */
1888                 if ((xhci->quirks & XHCI_MISSING_CAS) &&
1889                     (hcd->speed >= HCD_USB3) &&
1890                     xhci_port_missing_cas_quirk(ports[port_index])) {
1891                         xhci_dbg(xhci, "reset stuck port %d-%d\n",
1892                                  hcd->self.busnum, port_index + 1);
1893                         clear_bit(port_index, &bus_state->bus_suspended);
1894                         continue;
1895                 }
1896                 /* resume if we suspended the link, and it is still suspended */
1897                 if (test_bit(port_index, &bus_state->bus_suspended))
1898                         switch (portsc & PORT_PLS_MASK) {
1899                         case XDEV_U3:
1900                                 portsc = xhci_port_state_to_neutral(portsc);
1901                                 portsc &= ~PORT_PLS_MASK;
1902                                 portsc |= PORT_LINK_STROBE | next_state;
1903                                 break;
1904                         case XDEV_RESUME:
1905                                 /* resume already initiated */
1906                                 break;
1907                         default:
1908                                 /* not in a resumeable state, ignore it */
1909                                 clear_bit(port_index,
1910                                           &bus_state->bus_suspended);
1911                                 break;
1912                         }
1913                 /* disable wake for all ports, write new link state if needed */
1914                 portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1915                 writel(portsc, ports[port_index]->addr);
1916         }
1917
1918         /* USB2 specific resume signaling delay and U0 link state transition */
1919         if (hcd->speed < HCD_USB3) {
1920                 if (bus_state->bus_suspended) {
1921                         spin_unlock_irqrestore(&xhci->lock, flags);
1922                         msleep(USB_RESUME_TIMEOUT);
1923                         spin_lock_irqsave(&xhci->lock, flags);
1924                 }
1925                 for_each_set_bit(port_index, &bus_state->bus_suspended,
1926                                  BITS_PER_LONG) {
1927                         /* Clear PLC to poll it later for U0 transition */
1928                         xhci_test_and_clear_bit(xhci, ports[port_index],
1929                                                 PORT_PLC);
1930                         xhci_set_link_state(xhci, ports[port_index], XDEV_U0);
1931                 }
1932         }
1933
1934         /* poll for U0 link state complete, both USB2 and USB3 */
1935         for_each_set_bit(port_index, &bus_state->bus_suspended, BITS_PER_LONG) {
1936                 sret = xhci_handshake(ports[port_index]->addr, PORT_PLC,
1937                                       PORT_PLC, 10 * 1000);
1938                 if (sret) {
1939                         xhci_warn(xhci, "port %d-%d resume PLC timeout\n",
1940                                   hcd->self.busnum, port_index + 1);
1941                         continue;
1942                 }
1943                 xhci_test_and_clear_bit(xhci, ports[port_index], PORT_PLC);
1944                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1945                 if (slot_id)
1946                         xhci_ring_device(xhci, slot_id);
1947         }
1948         (void) readl(&xhci->op_regs->command);
1949
1950         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1951         /* re-enable irqs */
1952         temp = readl(&xhci->op_regs->command);
1953         temp |= CMD_EIE;
1954         writel(temp, &xhci->op_regs->command);
1955         temp = readl(&xhci->op_regs->command);
1956
1957         spin_unlock_irqrestore(&xhci->lock, flags);
1958         return 0;
1959 }
1960
1961 unsigned long xhci_get_resuming_ports(struct usb_hcd *hcd)
1962 {
1963         struct xhci_hub *rhub = xhci_get_rhub(hcd);
1964
1965         /* USB3 port wakeups are reported via usb_wakeup_notification() */
1966         return rhub->bus_state.resuming_ports;  /* USB2 ports only */
1967 }
1968
1969 #endif  /* CONFIG_PM */