sound/usb/clock.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Clock domain and sample rate management functions
   4  */
   5
   6 #include <linux/bitops.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12 #include <linux/usb/audio-v3.h>
  13
  14 #include <sound/core.h>
  15 #include <sound/info.h>
  16 #include <sound/pcm.h>
  17
  18 #include "usbaudio.h"
  19 #include "card.h"
  20 #include "helper.h"
  21 #include "clock.h"
  22 #include "quirks.h"
  23
  24 union uac23_clock_source_desc {
  25         struct uac_clock_source_descriptor v2;
  26         struct uac3_clock_source_descriptor v3;
  27 };
  28
  29 union uac23_clock_selector_desc {
  30         struct uac_clock_selector_descriptor v2;
  31         struct uac3_clock_selector_descriptor v3;
  32 };
  33
  34 union uac23_clock_multiplier_desc {
  35         struct uac_clock_multiplier_descriptor v2;
  36         struct uac_clock_multiplier_descriptor v3;
  37 };
  38
  39 #define GET_VAL(p, proto, field) \
  40         ((proto) == UAC_VERSION_3 ? (p)->v3.field : (p)->v2.field)
  41
  42 static void *find_uac_clock_desc(struct usb_host_interface *iface, int id,
  43                                  bool (*validator)(void *, int, int),
  44                                  u8 type, int proto)
  45 {
  46         void *cs = NULL;
  47
  48         while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen,
  49                                              cs, type))) {
  50                 if (validator(cs, id, proto))
  51                         return cs;
  52         }
  53
  54         return NULL;
  55 }
  56
  57 static bool validate_clock_source(void *p, int id, int proto)
  58 {
  59         union uac23_clock_source_desc *cs = p;
  60
  61         return GET_VAL(cs, proto, bClockID) == id;
  62 }
  63
  64 static bool validate_clock_selector(void *p, int id, int proto)
  65 {
  66         union uac23_clock_selector_desc *cs = p;
  67
  68         return GET_VAL(cs, proto, bClockID) == id;
  69 }
  70
  71 static bool validate_clock_multiplier(void *p, int id, int proto)
  72 {
  73         union uac23_clock_multiplier_desc *cs = p;
  74
  75         return GET_VAL(cs, proto, bClockID) == id;
  76 }
  77
  78 #define DEFINE_FIND_HELPER(name, obj, validator, type2, type3)          \
  79 static obj *name(struct snd_usb_audio *chip, int id,    \
  80                                 const struct audioformat *fmt)  \
  81 {                                                                       \
  82         struct usb_host_interface *ctrl_intf =  \
  83                 snd_usb_find_ctrl_interface(chip, fmt->iface); \
  84         return find_uac_clock_desc(ctrl_intf, id, validator,    \
  85                                    fmt->protocol == UAC_VERSION_3 ? (type3) : (type2), \
  86                                    fmt->protocol);                              \
  87 }
  88
  89 DEFINE_FIND_HELPER(snd_usb_find_clock_source,
  90                    union uac23_clock_source_desc, validate_clock_source,
  91                    UAC2_CLOCK_SOURCE, UAC3_CLOCK_SOURCE);
  92 DEFINE_FIND_HELPER(snd_usb_find_clock_selector,
  93                    union uac23_clock_selector_desc, validate_clock_selector,
  94                    UAC2_CLOCK_SELECTOR, UAC3_CLOCK_SELECTOR);
  95 DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier,
  96                    union uac23_clock_multiplier_desc, validate_clock_multiplier,
  97                    UAC2_CLOCK_MULTIPLIER, UAC3_CLOCK_MULTIPLIER);
  98
  99 static int uac_clock_selector_get_val(struct snd_usb_audio *chip,
 100                                 int selector_id, int iface_no)
 101 {
 102         struct usb_host_interface *ctrl_intf;
 103         unsigned char buf;
 104         int ret;
 105
 106         ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
 107         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
 108                               UAC2_CS_CUR,
 109                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 110                               UAC2_CX_CLOCK_SELECTOR << 8,
 111                               snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8),
 112                               &buf, sizeof(buf));
 113
 114         if (ret < 0)
 115                 return ret;
 116
 117         return buf;
 118 }
 119
 120 static int uac_clock_selector_set_val(struct snd_usb_audio *chip,
 121                                         int selector_id, unsigned char pin, int iface_no)
 122 {
 123         struct usb_host_interface *ctrl_intf;
 124         int ret;
 125
 126         ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
 127         ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
 128                               UAC2_CS_CUR,
 129                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 130                               UAC2_CX_CLOCK_SELECTOR << 8,
 131                               snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8),
 132                               &pin, sizeof(pin));
 133         if (ret < 0)
 134                 return ret;
 135
 136         if (ret != sizeof(pin)) {
 137                 usb_audio_err(chip,
 138                         "setting selector (id %d) unexpected length %d\n",
 139                         selector_id, ret);
 140                 return -EINVAL;
 141         }
 142
 143         ret = uac_clock_selector_get_val(chip, selector_id, iface_no);
 144         if (ret < 0)
 145                 return ret;
 146
 147         if (ret != pin) {
 148                 usb_audio_err(chip,
 149                         "setting selector (id %d) to %x failed (current: %d)\n",
 150                         selector_id, pin, ret);
 151                 return -EINVAL;
 152         }
 153
 154         return ret;
 155 }
 156
 157 static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
 158                                             const struct audioformat *fmt,
 159                                             int source_id)
 160 {
 161         bool ret = false;
 162         int count;
 163         unsigned char data;
 164         struct usb_device *dev = chip->dev;
 165         union uac23_clock_source_desc *cs_desc;
 166         struct usb_host_interface *ctrl_intf;
 167
 168         ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface);
 169         cs_desc = snd_usb_find_clock_source(chip, source_id, fmt);
 170         if (!cs_desc)
 171                 return false;
 172
 173         if (fmt->protocol == UAC_VERSION_2) {
 174                 /*
 175                  * Assume the clock is valid if clock source supports only one
 176                  * single sample rate, the terminal is connected directly to it
 177                  * (there is no clock selector) and clock type is internal.
 178                  * This is to deal with some Denon DJ controllers that always
 179                  * reports that clock is invalid.
 180                  */
 181                 if (fmt->nr_rates == 1 &&
 182                     (fmt->clock & 0xff) == cs_desc->v2.bClockID &&
 183                     (cs_desc->v2.bmAttributes & 0x3) !=
 184                                 UAC_CLOCK_SOURCE_TYPE_EXT)
 185                         return true;
 186         }
 187
 188         /*
 189          * MOTU MicroBook IIc
 190          * Sample rate changes takes more than 2 seconds for this device. Clock
 191          * validity request returns false during that period.
 192          */
 193         if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
 194                 count = 0;
 195
 196                 while ((!ret) && (count < 50)) {
 197                         int err;
 198
 199                         msleep(100);
 200
 201                         err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 202                                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 203                                               UAC2_CS_CONTROL_CLOCK_VALID << 8,
 204                                               snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8),
 205                                               &data, sizeof(data));
 206                         if (err < 0) {
 207                                 dev_warn(&dev->dev,
 208                                          "%s(): cannot get clock validity for id %d\n",
 209                                            __func__, source_id);
 210                                 return false;
 211                         }
 212
 213                         ret = !!data;
 214                         count++;
 215                 }
 216         }
 217
 218         return ret;
 219 }
 220
 221 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
 222                                       const struct audioformat *fmt,
 223                                       int source_id)
 224 {
 225         int err;
 226         unsigned char data;
 227         struct usb_device *dev = chip->dev;
 228         u32 bmControls;
 229         union uac23_clock_source_desc *cs_desc;
 230         struct usb_host_interface *ctrl_intf;
 231
 232         ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface);
 233         cs_desc = snd_usb_find_clock_source(chip, source_id, fmt);
 234         if (!cs_desc)
 235                 return false;
 236
 237         if (fmt->protocol == UAC_VERSION_3)
 238                 bmControls = le32_to_cpu(cs_desc->v3.bmControls);
 239         else
 240                 bmControls = cs_desc->v2.bmControls;
 241
 242         /* If a clock source can't tell us whether it's valid, we assume it is */
 243         if (!uac_v2v3_control_is_readable(bmControls,
 244                                       UAC2_CS_CONTROL_CLOCK_VALID))
 245                 return true;
 246
 247         err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 248                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 249                               UAC2_CS_CONTROL_CLOCK_VALID << 8,
 250                               snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8),
 251                               &data, sizeof(data));
 252
 253         if (err < 0) {
 254                 dev_warn(&dev->dev,
 255                          "%s(): cannot get clock validity for id %d\n",
 256                            __func__, source_id);
 257                 return false;
 258         }
 259
 260         if (data)
 261                 return true;
 262         else
 263                 return uac_clock_source_is_valid_quirk(chip, fmt, source_id);
 264 }
 265
 266 static int __uac_clock_find_source(struct snd_usb_audio *chip,
 267                                    const struct audioformat *fmt, int entity_id,
 268                                    unsigned long *visited, bool validate)
 269 {
 270         union uac23_clock_source_desc *source;
 271         union uac23_clock_selector_desc *selector;
 272         union uac23_clock_multiplier_desc *multiplier;
 273         int ret, i, cur, err, pins, clock_id;
 274         const u8 *sources;
 275         int proto = fmt->protocol;
 276         bool readable, writeable;
 277         u32 bmControls;
 278
 279         entity_id &= 0xff;
 280
 281         if (test_and_set_bit(entity_id, visited)) {
 282                 usb_audio_warn(chip,
 283                          "%s(): recursive clock topology detected, id %d.\n",
 284                          __func__, entity_id);
 285                 return -EINVAL;
 286         }
 287
 288         /* first, see if the ID we're looking at is a clock source already */
 289         source = snd_usb_find_clock_source(chip, entity_id, fmt);
 290         if (source) {
 291                 entity_id = GET_VAL(source, proto, bClockID);
 292                 if (validate && !uac_clock_source_is_valid(chip, fmt,
 293                                                                 entity_id)) {
 294                         usb_audio_err(chip,
 295                                 "clock source %d is not valid, cannot use\n",
 296                                 entity_id);
 297                         return -ENXIO;
 298                 }
 299                 return entity_id;
 300         }
 301
 302         selector = snd_usb_find_clock_selector(chip, entity_id, fmt);
 303         if (selector) {
 304                 pins = GET_VAL(selector, proto, bNrInPins);
 305                 clock_id = GET_VAL(selector, proto, bClockID);
 306                 sources = GET_VAL(selector, proto, baCSourceID);
 307                 cur = 0;
 308
 309                 if (proto == UAC_VERSION_3)
 310                         bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins));
 311                 else
 312                         bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins);
 313
 314                 readable = uac_v2v3_control_is_readable(bmControls,
 315                                                         UAC2_CX_CLOCK_SELECTOR);
 316                 writeable = uac_v2v3_control_is_writeable(bmControls,
 317                                                           UAC2_CX_CLOCK_SELECTOR);
 318
 319                 if (pins == 1) {
 320                         ret = 1;
 321                         goto find_source;
 322                 }
 323
 324                 /* for now just warn about buggy device */
 325                 if (!readable)
 326                         usb_audio_warn(chip,
 327                                 "%s(): clock selector control is not readable, id %d\n",
 328                                 __func__, clock_id);
 329
 330                 /* the entity ID we are looking at is a selector.
 331                  * find out what it currently selects */
 332                 ret = uac_clock_selector_get_val(chip, clock_id, fmt->iface);
 333                 if (ret < 0) {
 334                         if (!chip->autoclock)
 335                                 return ret;
 336                         goto find_others;
 337                 }
 338
 339                 /* Selector values are one-based */
 340
 341                 if (ret > pins || ret < 1) {
 342                         usb_audio_err(chip,
 343                                 "%s(): selector reported illegal value, id %d, ret %d\n",
 344                                 __func__, clock_id, ret);
 345
 346                         if (!chip->autoclock)
 347                                 return -EINVAL;
 348                         goto find_others;
 349                 }
 350
 351         find_source:
 352                 cur = ret;
 353                 ret = __uac_clock_find_source(chip, fmt,
 354                                               sources[ret - 1],
 355                                               visited, validate);
 356                 if (ret > 0) {
 357                         /* Skip setting clock selector again for some devices */
 358                         if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR ||
 359                             !writeable)
 360                                 return ret;
 361                         err = uac_clock_selector_set_val(chip, entity_id, cur, fmt->iface);
 362                         if (err < 0) {
 363                                 if (pins == 1) {
 364                                         usb_audio_dbg(chip,
 365                                                       "%s(): selector returned an error, "
 366                                                       "assuming a firmware bug, id %d, ret %d\n",
 367                                                       __func__, clock_id, err);
 368                                         return ret;
 369                                 }
 370                                 return err;
 371                         }
 372                 }
 373
 374                 if (!validate || ret > 0 || !chip->autoclock)
 375                         return ret;
 376
 377         find_others:
 378                 if (!writeable)
 379                         return -ENXIO;
 380
 381                 /* The current clock source is invalid, try others. */
 382                 for (i = 1; i <= pins; i++) {
 383                         if (i == cur)
 384                                 continue;
 385
 386                         ret = __uac_clock_find_source(chip, fmt,
 387                                                       sources[i - 1],
 388                                                       visited, true);
 389                         if (ret < 0)
 390                                 continue;
 391
 392                         err = uac_clock_selector_set_val(chip, entity_id, i, fmt->iface);
 393                         if (err < 0)
 394                                 continue;
 395
 396                         usb_audio_info(chip,
 397                                  "found and selected valid clock source %d\n",
 398                                  ret);
 399                         return ret;
 400                 }
 401
 402                 return -ENXIO;
 403         }
 404
 405         /* FIXME: multipliers only act as pass-thru element for now */
 406         multiplier = snd_usb_find_clock_multiplier(chip, entity_id, fmt);
 407         if (multiplier)
 408                 return __uac_clock_find_source(chip, fmt,
 409                                                GET_VAL(multiplier, proto, bCSourceID),
 410                                                visited, validate);
 411
 412         return -EINVAL;
 413 }
 414
 415 /*
 416  * For all kinds of sample rate settings and other device queries,
 417  * the clock source (end-leaf) must be used. However, clock selectors,
 418  * clock multipliers and sample rate converters may be specified as
 419  * clock source input to terminal. This functions walks the clock path
 420  * to its end and tries to find the source.
 421  *
 422  * The 'visited' bitfield is used internally to detect recursive loops.
 423  *
 424  * Returns the clock source UnitID (>=0) on success, or an error.
 425  */
 426 int snd_usb_clock_find_source(struct snd_usb_audio *chip,
 427                               const struct audioformat *fmt, bool validate)
 428 {
 429         DECLARE_BITMAP(visited, 256);
 430         memset(visited, 0, sizeof(visited));
 431
 432         switch (fmt->protocol) {
 433         case UAC_VERSION_2:
 434         case UAC_VERSION_3:
 435                 return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
 436                                                validate);
 437         default:
 438                 return -EINVAL;
 439         }
 440 }
 441
 442 static int set_sample_rate_v1(struct snd_usb_audio *chip,
 443                               const struct audioformat *fmt, int rate)
 444 {
 445         struct usb_device *dev = chip->dev;
 446         unsigned char data[3];
 447         int err, crate;
 448
 449         /* if endpoint doesn't have sampling rate control, bail out */
 450         if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
 451                 return 0;
 452
 453         data[0] = rate;
 454         data[1] = rate >> 8;
 455         data[2] = rate >> 16;
 456         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 457                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 458                               UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
 459                               fmt->endpoint, data, sizeof(data));
 460         if (err < 0) {
 461                 dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
 462                         fmt->iface, fmt->altsetting, rate, fmt->endpoint);
 463                 return err;
 464         }
 465
 466         /* Don't check the sample rate for devices which we know don't
 467          * support reading */
 468         if (chip->quirk_flags & QUIRK_FLAG_GET_SAMPLE_RATE)
 469                 return 0;
 470         /* the firmware is likely buggy, don't repeat to fail too many times */
 471         if (chip->sample_rate_read_error > 2)
 472                 return 0;
 473
 474         err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
 475                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
 476                               UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
 477                               fmt->endpoint, data, sizeof(data));
 478         if (err < 0) {
 479                 dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
 480                         fmt->iface, fmt->altsetting, fmt->endpoint);
 481                 chip->sample_rate_read_error++;
 482                 return 0; /* some devices don't support reading */
 483         }
 484
 485         crate = data[0] | (data[1] << 8) | (data[2] << 16);
 486         if (!crate) {
 487                 dev_info(&dev->dev, "failed to read current rate; disabling the check\n");
 488                 chip->sample_rate_read_error = 3; /* three strikes, see above */
 489                 return 0;
 490         }
 491
 492         if (crate != rate) {
 493                 dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
 494                 // runtime->rate = crate;
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
 501                               int altsetting, int clock)
 502 {
 503         struct usb_device *dev = chip->dev;
 504         __le32 data;
 505         int err;
 506         struct usb_host_interface *ctrl_intf;
 507
 508         ctrl_intf = snd_usb_find_ctrl_interface(chip, iface);
 509         err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 510                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 511                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 512                               snd_usb_ctrl_intf(ctrl_intf) | (clock << 8),
 513                               &data, sizeof(data));
 514         if (err < 0) {
 515                 dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n",
 516                          iface, altsetting, err);
 517                 return 0;
 518         }
 519
 520         return le32_to_cpu(data);
 521 }
 522
 523 /*
 524  * Try to set the given sample rate:
 525  *
 526  * Return 0 if the clock source is read-only, the actual rate on success,
 527  * or a negative error code.
 528  *
 529  * This function gets called from format.c to validate each sample rate, too.
 530  * Hence no message is shown upon error
 531  */
 532 int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
 533                                  const struct audioformat *fmt,
 534                                  int clock, int rate)
 535 {
 536         bool writeable;
 537         u32 bmControls;
 538         __le32 data;
 539         int err;
 540         union uac23_clock_source_desc *cs_desc;
 541         struct usb_host_interface *ctrl_intf;
 542
 543         ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface);
 544         cs_desc = snd_usb_find_clock_source(chip, clock, fmt);
 545
 546         if (!cs_desc)
 547                 return 0;
 548
 549         if (fmt->protocol == UAC_VERSION_3)
 550                 bmControls = le32_to_cpu(cs_desc->v3.bmControls);
 551         else
 552                 bmControls = cs_desc->v2.bmControls;
 553
 554         writeable = uac_v2v3_control_is_writeable(bmControls,
 555                                                   UAC2_CS_CONTROL_SAM_FREQ);
 556         if (!writeable)
 557                 return 0;
 558
 559         data = cpu_to_le32(rate);
 560         err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
 561                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 562                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 563                               snd_usb_ctrl_intf(ctrl_intf) | (clock << 8),
 564                               &data, sizeof(data));
 565         if (err < 0)
 566                 return err;
 567
 568         return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
 569 }
 570
 571 static int set_sample_rate_v2v3(struct snd_usb_audio *chip,
 572                                 const struct audioformat *fmt, int rate)
 573 {
 574         int cur_rate, prev_rate;
 575         int clock;
 576
 577         /* First, try to find a valid clock. This may trigger
 578          * automatic clock selection if the current clock is not
 579          * valid.
 580          */
 581         clock = snd_usb_clock_find_source(chip, fmt, true);
 582         if (clock < 0) {
 583                 /* We did not find a valid clock, but that might be
 584                  * because the current sample rate does not match an
 585                  * external clock source. Try again without validation
 586                  * and we will do another validation after setting the
 587                  * rate.
 588                  */
 589                 clock = snd_usb_clock_find_source(chip, fmt, false);
 590
 591                 /* Hardcoded sample rates */
 592                 if (chip->quirk_flags & QUIRK_FLAG_IGNORE_CLOCK_SOURCE)
 593                         return 0;
 594
 595                 if (clock < 0)
 596                         return clock;
 597         }
 598
 599         prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
 600         if (prev_rate == rate)
 601                 goto validation;
 602
 603         cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate);
 604         if (cur_rate < 0) {
 605                 usb_audio_err(chip,
 606                               "%d:%d: cannot set freq %d (v2/v3): err %d\n",
 607                               fmt->iface, fmt->altsetting, rate, cur_rate);
 608                 return cur_rate;
 609         }
 610
 611         if (!cur_rate)
 612                 cur_rate = prev_rate;
 613
 614         if (cur_rate != rate) {
 615                 usb_audio_dbg(chip,
 616                               "%d:%d: freq mismatch: req %d, clock runs @%d\n",
 617                               fmt->iface, fmt->altsetting, rate, cur_rate);
 618                 /* continue processing */
 619         }
 620
 621         /* FIXME - TEAC devices require the immediate interface setup */
 622         if (USB_ID_VENDOR(chip->usb_id) == 0x0644) {
 623                 bool cur_base_48k = (rate % 48000 == 0);
 624                 bool prev_base_48k = (prev_rate % 48000 == 0);
 625                 if (cur_base_48k != prev_base_48k) {
 626                         usb_set_interface(chip->dev, fmt->iface, fmt->altsetting);
 627                         if (chip->quirk_flags & QUIRK_FLAG_IFACE_DELAY)
 628                                 msleep(50);
 629                 }
 630         }
 631
 632 validation:
 633         /* validate clock after rate change */
 634         if (!uac_clock_source_is_valid(chip, fmt, clock))
 635                 return -ENXIO;
 636         return 0;
 637 }
 638
 639 int snd_usb_init_sample_rate(struct snd_usb_audio *chip,
 640                              const struct audioformat *fmt, int rate)
 641 {
 642         usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n",
 643                       fmt->iface, fmt->altsetting, rate, fmt->clock);
 644
 645         switch (fmt->protocol) {
 646         case UAC_VERSION_1:
 647         default:
 648                 return set_sample_rate_v1(chip, fmt, rate);
 649
 650         case UAC_VERSION_3:
 651                 if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 652                         if (rate != UAC3_BADD_SAMPLING_RATE)
 653                                 return -ENXIO;
 654                         else
 655                                 return 0;
 656                 }
 657                 fallthrough;
 658         case UAC_VERSION_2:
 659                 return set_sample_rate_v2v3(chip, fmt, rate);
 660         }
 661 }
 662