1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> 4 */ 5 6 #include <linux/usb.h> 7 #include <linux/gfp.h> 8 9 #include "usb_stream.h" 10 11 12 /* setup */ 13 14 static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) 15 { 16 struct usb_stream *s = sk->s; 17 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; 18 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; 19 } 20 21 static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) 22 { 23 struct usb_stream *s = sk->s; 24 int pack, lb = 0; 25 26 for (pack = 0; pack < sk->n_o_ps; pack++) { 27 int l = usb_stream_next_packet_size(sk); 28 if (s->idle_outsize + lb + l > s->period_size) 29 goto check; 30 31 sk->out_phase = sk->out_phase_peeked; 32 urb->iso_frame_desc[pack].offset = lb; 33 urb->iso_frame_desc[pack].length = l; 34 lb += l; 35 } 36 snd_printdd(KERN_DEBUG "%i\n", lb); 37 38 check: 39 urb->number_of_packets = pack; 40 urb->transfer_buffer_length = lb; 41 s->idle_outsize += lb - s->period_size; 42 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, 43 lb, s->period_size); 44 } 45 46 static int init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 47 struct urb **urbs, char *transfer, 48 struct usb_device *dev, int pipe) 49 { 50 int u, p; 51 int maxpacket = use_packsize ? 52 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); 53 int transfer_length = maxpacket * sk->n_o_ps; 54 55 for (u = 0; u < USB_STREAM_NURBS; 56 ++u, transfer += transfer_length) { 57 struct urb *urb = urbs[u]; 58 struct usb_iso_packet_descriptor *desc; 59 urb->transfer_buffer = transfer; 60 urb->dev = dev; 61 urb->pipe = pipe; 62 urb->number_of_packets = sk->n_o_ps; 63 urb->context = sk; 64 urb->interval = 1; 65 if (usb_pipeout(pipe)) 66 continue; 67 if (usb_urb_ep_type_check(urb)) 68 return -EINVAL; 69 70 urb->transfer_buffer_length = transfer_length; 71 desc = urb->iso_frame_desc; 72 desc->offset = 0; 73 desc->length = maxpacket; 74 for (p = 1; p < sk->n_o_ps; ++p) { 75 desc[p].offset = desc[p - 1].offset + maxpacket; 76 desc[p].length = maxpacket; 77 } 78 } 79 80 return 0; 81 } 82 83 static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, 84 struct usb_device *dev, int in_pipe, int out_pipe) 85 { 86 struct usb_stream *s = sk->s; 87 char *indata = (char *)s + sizeof(*s) + 88 sizeof(struct usb_stream_packet) * 89 s->inpackets; 90 int u; 91 92 for (u = 0; u < USB_STREAM_NURBS; ++u) { 93 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 94 if (!sk->inurb[u]) 95 return -ENOMEM; 96 97 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); 98 if (!sk->outurb[u]) 99 return -ENOMEM; 100 } 101 102 if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe) || 103 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, 104 out_pipe)) 105 return -EINVAL; 106 107 return 0; 108 } 109 110 111 /* 112 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 113 * this will overflow at approx 524 kHz 114 */ 115 static inline unsigned get_usb_full_speed_rate(unsigned rate) 116 { 117 return ((rate << 13) + 62) / 125; 118 } 119 120 /* 121 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 122 * this will overflow at approx 4 MHz 123 */ 124 static inline unsigned get_usb_high_speed_rate(unsigned rate) 125 { 126 return ((rate << 10) + 62) / 125; 127 } 128 129 void usb_stream_free(struct usb_stream_kernel *sk) 130 { 131 struct usb_stream *s; 132 unsigned u; 133 134 for (u = 0; u < USB_STREAM_NURBS; ++u) { 135 usb_free_urb(sk->inurb[u]); 136 sk->inurb[u] = NULL; 137 usb_free_urb(sk->outurb[u]); 138 sk->outurb[u] = NULL; 139 } 140 141 s = sk->s; 142 if (!s) 143 return; 144 145 free_pages_exact(sk->write_page, s->write_size); 146 sk->write_page = NULL; 147 free_pages_exact(s, s->read_size); 148 sk->s = NULL; 149 } 150 151 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, 152 struct usb_device *dev, 153 unsigned in_endpoint, unsigned out_endpoint, 154 unsigned sample_rate, unsigned use_packsize, 155 unsigned period_frames, unsigned frame_size) 156 { 157 int packets, max_packsize; 158 int in_pipe, out_pipe; 159 int read_size = sizeof(struct usb_stream); 160 int write_size; 161 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; 162 163 in_pipe = usb_rcvisocpipe(dev, in_endpoint); 164 out_pipe = usb_sndisocpipe(dev, out_endpoint); 165 166 max_packsize = use_packsize ? 167 use_packsize : usb_maxpacket(dev, in_pipe, 0); 168 169 /* 170 t_period = period_frames / sample_rate 171 iso_packs = t_period / t_iso_frame 172 = (period_frames / sample_rate) * (1 / t_iso_frame) 173 */ 174 175 packets = period_frames * usb_frames / sample_rate + 1; 176 177 if (dev->speed == USB_SPEED_HIGH) 178 packets = (packets + 7) & ~7; 179 180 read_size += packets * USB_STREAM_URBDEPTH * 181 (max_packsize + sizeof(struct usb_stream_packet)); 182 183 max_packsize = usb_maxpacket(dev, out_pipe, 1); 184 write_size = max_packsize * packets * USB_STREAM_URBDEPTH; 185 186 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { 187 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); 188 goto out; 189 } 190 191 sk->s = alloc_pages_exact(read_size, 192 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 193 if (!sk->s) { 194 pr_warn("us122l: couldn't allocate read buffer\n"); 195 goto out; 196 } 197 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; 198 199 sk->s->read_size = read_size; 200 201 sk->s->cfg.sample_rate = sample_rate; 202 sk->s->cfg.frame_size = frame_size; 203 sk->n_o_ps = packets; 204 sk->s->inpackets = packets * USB_STREAM_URBDEPTH; 205 sk->s->cfg.period_frames = period_frames; 206 sk->s->period_size = frame_size * period_frames; 207 208 sk->s->write_size = write_size; 209 210 sk->write_page = alloc_pages_exact(write_size, 211 GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); 212 if (!sk->write_page) { 213 pr_warn("us122l: couldn't allocate write buffer\n"); 214 usb_stream_free(sk); 215 return NULL; 216 } 217 218 /* calculate the frequency in 16.16 format */ 219 if (dev->speed == USB_SPEED_FULL) 220 sk->freqn = get_usb_full_speed_rate(sample_rate); 221 else 222 sk->freqn = get_usb_high_speed_rate(sample_rate); 223 224 if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) { 225 usb_stream_free(sk); 226 return NULL; 227 } 228 229 sk->s->state = usb_stream_stopped; 230 out: 231 return sk->s; 232 } 233 234 235 /* start */ 236 237 static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) 238 { 239 bool r; 240 if (unlikely(urb->status)) { 241 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) 242 snd_printk(KERN_WARNING "status=%i\n", urb->status); 243 sk->iso_frame_balance = 0x7FFFFFFF; 244 return false; 245 } 246 r = sk->iso_frame_balance == 0; 247 if (!r) 248 sk->i_urb = urb; 249 return r; 250 } 251 252 static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) 253 { 254 sk->iso_frame_balance += urb->number_of_packets; 255 return balance_check(sk, urb); 256 } 257 258 static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) 259 { 260 sk->iso_frame_balance -= urb->number_of_packets; 261 return balance_check(sk, urb); 262 } 263 264 static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) 265 { 266 int u; 267 268 for (u = 0; u < USB_STREAM_NURBS; u++) { 269 struct urb *urb = urbs[u]; 270 urb->complete = complete; 271 } 272 } 273 274 static int usb_stream_prepare_playback(struct usb_stream_kernel *sk, 275 struct urb *inurb) 276 { 277 struct usb_stream *s = sk->s; 278 struct urb *io; 279 struct usb_iso_packet_descriptor *id, *od; 280 int p = 0, lb = 0, l = 0; 281 282 io = sk->idle_outurb; 283 od = io->iso_frame_desc; 284 285 for (; s->sync_packet < 0; ++p, ++s->sync_packet) { 286 struct urb *ii = sk->completed_inurb; 287 id = ii->iso_frame_desc + 288 ii->number_of_packets + s->sync_packet; 289 l = id->actual_length; 290 291 od[p].length = l; 292 od[p].offset = lb; 293 lb += l; 294 } 295 296 for (; 297 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; 298 ++p, ++s->sync_packet) { 299 l = inurb->iso_frame_desc[s->sync_packet].actual_length; 300 301 if (s->idle_outsize + lb + l > s->period_size) 302 goto check_ok; 303 304 od[p].length = l; 305 od[p].offset = lb; 306 lb += l; 307 } 308 309 check_ok: 310 s->sync_packet -= inurb->number_of_packets; 311 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) { 312 snd_printk(KERN_WARNING "invalid sync_packet = %i;" 313 " p=%i nop=%i %i %x %x %x > %x\n", 314 s->sync_packet, p, inurb->number_of_packets, 315 s->idle_outsize + lb + l, 316 s->idle_outsize, lb, l, 317 s->period_size); 318 return -1; 319 } 320 if (unlikely(lb % s->cfg.frame_size)) { 321 snd_printk(KERN_WARNING"invalid outsize = %i\n", 322 lb); 323 return -1; 324 } 325 s->idle_outsize += lb - s->period_size; 326 io->number_of_packets = p; 327 io->transfer_buffer_length = lb; 328 if (s->idle_outsize <= 0) 329 return 0; 330 331 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); 332 return -1; 333 } 334 335 static void prepare_inurb(int number_of_packets, struct urb *iu) 336 { 337 struct usb_iso_packet_descriptor *id; 338 int p; 339 340 iu->number_of_packets = number_of_packets; 341 id = iu->iso_frame_desc; 342 id->offset = 0; 343 for (p = 0; p < iu->number_of_packets - 1; ++p) 344 id[p + 1].offset = id[p].offset + id[p].length; 345 346 iu->transfer_buffer_length = 347 id[0].length * iu->number_of_packets; 348 } 349 350 static int submit_urbs(struct usb_stream_kernel *sk, 351 struct urb *inurb, struct urb *outurb) 352 { 353 int err; 354 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); 355 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); 356 if (err < 0) 357 goto report_failure; 358 359 sk->idle_inurb = sk->completed_inurb; 360 sk->completed_inurb = inurb; 361 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); 362 if (err < 0) 363 goto report_failure; 364 365 sk->idle_outurb = sk->completed_outurb; 366 sk->completed_outurb = outurb; 367 return 0; 368 369 report_failure: 370 snd_printk(KERN_ERR "%i\n", err); 371 return err; 372 } 373 374 #ifdef DEBUG_LOOP_BACK 375 /* 376 This loop_back() shows how to read/write the period data. 377 */ 378 static void loop_back(struct usb_stream *s) 379 { 380 char *i, *o; 381 int il, ol, l, p; 382 struct urb *iu; 383 struct usb_iso_packet_descriptor *id; 384 385 o = s->playback1st_to; 386 ol = s->playback1st_size; 387 l = 0; 388 389 if (s->insplit_pack >= 0) { 390 iu = sk->idle_inurb; 391 id = iu->iso_frame_desc; 392 p = s->insplit_pack; 393 } else 394 goto second; 395 loop: 396 for (; p < iu->number_of_packets && l < s->period_size; ++p) { 397 i = iu->transfer_buffer + id[p].offset; 398 il = id[p].actual_length; 399 if (l + il > s->period_size) 400 il = s->period_size - l; 401 if (il <= ol) { 402 memcpy(o, i, il); 403 o += il; 404 ol -= il; 405 } else { 406 memcpy(o, i, ol); 407 singen_6pack(o, ol); 408 o = s->playback_to; 409 memcpy(o, i + ol, il - ol); 410 o += il - ol; 411 ol = s->period_size - s->playback1st_size; 412 } 413 l += il; 414 } 415 if (iu == sk->completed_inurb) { 416 if (l != s->period_size) 417 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, 418 l/(int)s->cfg.frame_size); 419 420 return; 421 } 422 second: 423 iu = sk->completed_inurb; 424 id = iu->iso_frame_desc; 425 p = 0; 426 goto loop; 427 428 } 429 #else 430 static void loop_back(struct usb_stream *s) 431 { 432 } 433 #endif 434 435 static void stream_idle(struct usb_stream_kernel *sk, 436 struct urb *inurb, struct urb *outurb) 437 { 438 struct usb_stream *s = sk->s; 439 int l, p; 440 int insize = s->idle_insize; 441 int urb_size = 0; 442 443 s->inpacket_split = s->next_inpacket_split; 444 s->inpacket_split_at = s->next_inpacket_split_at; 445 s->next_inpacket_split = -1; 446 s->next_inpacket_split_at = 0; 447 448 for (p = 0; p < inurb->number_of_packets; ++p) { 449 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; 450 l = id[p].actual_length; 451 if (unlikely(l == 0 || id[p].status)) { 452 snd_printk(KERN_WARNING "underrun, status=%u\n", 453 id[p].status); 454 goto err_out; 455 } 456 s->inpacket_head++; 457 s->inpacket_head %= s->inpackets; 458 if (s->inpacket_split == -1) 459 s->inpacket_split = s->inpacket_head; 460 461 s->inpacket[s->inpacket_head].offset = 462 id[p].offset + (inurb->transfer_buffer - (void *)s); 463 s->inpacket[s->inpacket_head].length = l; 464 if (insize + l > s->period_size && 465 s->next_inpacket_split == -1) { 466 s->next_inpacket_split = s->inpacket_head; 467 s->next_inpacket_split_at = s->period_size - insize; 468 } 469 insize += l; 470 urb_size += l; 471 } 472 s->idle_insize += urb_size - s->period_size; 473 if (s->idle_insize < 0) { 474 snd_printk(KERN_WARNING "%i\n", 475 (s->idle_insize)/(int)s->cfg.frame_size); 476 goto err_out; 477 } 478 s->insize_done += urb_size; 479 480 l = s->idle_outsize; 481 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - 482 sk->write_page) - l; 483 484 if (usb_stream_prepare_playback(sk, inurb) < 0) 485 goto err_out; 486 487 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; 488 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - 489 sk->write_page; 490 491 if (submit_urbs(sk, inurb, outurb) < 0) 492 goto err_out; 493 494 loop_back(s); 495 s->periods_done++; 496 wake_up_all(&sk->sleep); 497 return; 498 err_out: 499 s->state = usb_stream_xrun; 500 wake_up_all(&sk->sleep); 501 } 502 503 static void i_capture_idle(struct urb *urb) 504 { 505 struct usb_stream_kernel *sk = urb->context; 506 if (balance_capture(sk, urb)) 507 stream_idle(sk, urb, sk->i_urb); 508 } 509 510 static void i_playback_idle(struct urb *urb) 511 { 512 struct usb_stream_kernel *sk = urb->context; 513 if (balance_playback(sk, urb)) 514 stream_idle(sk, sk->i_urb, urb); 515 } 516 517 static void stream_start(struct usb_stream_kernel *sk, 518 struct urb *inurb, struct urb *outurb) 519 { 520 struct usb_stream *s = sk->s; 521 if (s->state >= usb_stream_sync1) { 522 int l, p, max_diff, max_diff_0; 523 int urb_size = 0; 524 unsigned frames_per_packet, min_frames = 0; 525 frames_per_packet = (s->period_size - s->idle_insize); 526 frames_per_packet <<= 8; 527 frames_per_packet /= 528 s->cfg.frame_size * inurb->number_of_packets; 529 frames_per_packet++; 530 531 max_diff_0 = s->cfg.frame_size; 532 if (s->cfg.period_frames >= 256) 533 max_diff_0 <<= 1; 534 if (s->cfg.period_frames >= 1024) 535 max_diff_0 <<= 1; 536 max_diff = max_diff_0; 537 for (p = 0; p < inurb->number_of_packets; ++p) { 538 int diff; 539 l = inurb->iso_frame_desc[p].actual_length; 540 urb_size += l; 541 542 min_frames += frames_per_packet; 543 diff = urb_size - 544 (min_frames >> 8) * s->cfg.frame_size; 545 if (diff < max_diff) { 546 snd_printdd(KERN_DEBUG "%i %i %i %i\n", 547 s->insize_done, 548 urb_size / (int)s->cfg.frame_size, 549 inurb->number_of_packets, diff); 550 max_diff = diff; 551 } 552 } 553 s->idle_insize -= max_diff - max_diff_0; 554 s->idle_insize += urb_size - s->period_size; 555 if (s->idle_insize < 0) { 556 snd_printk(KERN_WARNING "%i %i %i\n", 557 s->idle_insize, urb_size, s->period_size); 558 return; 559 } else if (s->idle_insize == 0) { 560 s->next_inpacket_split = 561 (s->inpacket_head + 1) % s->inpackets; 562 s->next_inpacket_split_at = 0; 563 } else { 564 unsigned split = s->inpacket_head; 565 l = s->idle_insize; 566 while (l > s->inpacket[split].length) { 567 l -= s->inpacket[split].length; 568 if (split == 0) 569 split = s->inpackets - 1; 570 else 571 split--; 572 } 573 s->next_inpacket_split = split; 574 s->next_inpacket_split_at = 575 s->inpacket[split].length - l; 576 } 577 578 s->insize_done += urb_size; 579 580 if (usb_stream_prepare_playback(sk, inurb) < 0) 581 return; 582 583 } else 584 playback_prep_freqn(sk, sk->idle_outurb); 585 586 if (submit_urbs(sk, inurb, outurb) < 0) 587 return; 588 589 if (s->state == usb_stream_sync1 && s->insize_done > 360000) { 590 /* just guesswork ^^^^^^ */ 591 s->state = usb_stream_ready; 592 subs_set_complete(sk->inurb, i_capture_idle); 593 subs_set_complete(sk->outurb, i_playback_idle); 594 } 595 } 596 597 static void i_capture_start(struct urb *urb) 598 { 599 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; 600 struct usb_stream_kernel *sk = urb->context; 601 struct usb_stream *s = sk->s; 602 int p; 603 int empty = 0; 604 605 if (urb->status) { 606 snd_printk(KERN_WARNING "status=%i\n", urb->status); 607 return; 608 } 609 610 for (p = 0; p < urb->number_of_packets; ++p) { 611 int l = id[p].actual_length; 612 if (l < s->cfg.frame_size) { 613 ++empty; 614 if (s->state >= usb_stream_sync0) { 615 snd_printk(KERN_WARNING "%i\n", l); 616 return; 617 } 618 } 619 s->inpacket_head++; 620 s->inpacket_head %= s->inpackets; 621 s->inpacket[s->inpacket_head].offset = 622 id[p].offset + (urb->transfer_buffer - (void *)s); 623 s->inpacket[s->inpacket_head].length = l; 624 } 625 #ifdef SHOW_EMPTY 626 if (empty) { 627 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, 628 urb->iso_frame_desc[0].actual_length); 629 for (pack = 1; pack < urb->number_of_packets; ++pack) { 630 int l = urb->iso_frame_desc[pack].actual_length; 631 printk(KERN_CONT " %i", l); 632 } 633 printk(KERN_CONT "\n"); 634 } 635 #endif 636 if (!empty && s->state < usb_stream_sync1) 637 ++s->state; 638 639 if (balance_capture(sk, urb)) 640 stream_start(sk, urb, sk->i_urb); 641 } 642 643 static void i_playback_start(struct urb *urb) 644 { 645 struct usb_stream_kernel *sk = urb->context; 646 if (balance_playback(sk, urb)) 647 stream_start(sk, sk->i_urb, urb); 648 } 649 650 int usb_stream_start(struct usb_stream_kernel *sk) 651 { 652 struct usb_stream *s = sk->s; 653 int frame = 0, iters = 0; 654 int u, err; 655 int try = 0; 656 657 if (s->state != usb_stream_stopped) 658 return -EAGAIN; 659 660 subs_set_complete(sk->inurb, i_capture_start); 661 subs_set_complete(sk->outurb, i_playback_start); 662 memset(sk->write_page, 0, s->write_size); 663 dotry: 664 s->insize_done = 0; 665 s->idle_insize = 0; 666 s->idle_outsize = 0; 667 s->sync_packet = -1; 668 s->inpacket_head = -1; 669 sk->iso_frame_balance = 0; 670 ++try; 671 for (u = 0; u < 2; u++) { 672 struct urb *inurb = sk->inurb[u]; 673 struct urb *outurb = sk->outurb[u]; 674 playback_prep_freqn(sk, outurb); 675 inurb->number_of_packets = outurb->number_of_packets; 676 inurb->transfer_buffer_length = 677 inurb->number_of_packets * 678 inurb->iso_frame_desc[0].length; 679 680 if (u == 0) { 681 int now; 682 struct usb_device *dev = inurb->dev; 683 frame = usb_get_current_frame_number(dev); 684 do { 685 now = usb_get_current_frame_number(dev); 686 ++iters; 687 } while (now > -1 && now == frame); 688 } 689 err = usb_submit_urb(inurb, GFP_ATOMIC); 690 if (err < 0) { 691 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" 692 " returned %i\n", u, err); 693 return err; 694 } 695 err = usb_submit_urb(outurb, GFP_ATOMIC); 696 if (err < 0) { 697 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" 698 " returned %i\n", u, err); 699 return err; 700 } 701 702 if (inurb->start_frame != outurb->start_frame) { 703 snd_printd(KERN_DEBUG 704 "u[%i] start_frames differ in:%u out:%u\n", 705 u, inurb->start_frame, outurb->start_frame); 706 goto check_retry; 707 } 708 } 709 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); 710 try = 0; 711 check_retry: 712 if (try) { 713 usb_stream_stop(sk); 714 if (try < 5) { 715 msleep(1500); 716 snd_printd(KERN_DEBUG "goto dotry;\n"); 717 goto dotry; 718 } 719 snd_printk(KERN_WARNING"couldn't start" 720 " all urbs on the same start_frame.\n"); 721 return -EFAULT; 722 } 723 724 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; 725 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; 726 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; 727 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; 728 729 /* wait, check */ 730 { 731 int wait_ms = 3000; 732 while (s->state != usb_stream_ready && wait_ms > 0) { 733 snd_printdd(KERN_DEBUG "%i\n", s->state); 734 msleep(200); 735 wait_ms -= 200; 736 } 737 } 738 739 return s->state == usb_stream_ready ? 0 : -EFAULT; 740 } 741 742 743 /* stop */ 744 745 void usb_stream_stop(struct usb_stream_kernel *sk) 746 { 747 int u; 748 if (!sk->s) 749 return; 750 for (u = 0; u < USB_STREAM_NURBS; ++u) { 751 usb_kill_urb(sk->inurb[u]); 752 usb_kill_urb(sk->outurb[u]); 753 } 754 sk->s->state = usb_stream_stopped; 755 msleep(400); 756 } 757