xref: /openbmc/linux/sound/usb/clock.c (revision 6a143a7c)
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 static void *find_uac_clock_desc(struct usb_host_interface *iface, int id,
25 				 bool (*validator)(void *, int), u8 type)
26 {
27 	void *cs = NULL;
28 
29 	while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen,
30 					     cs, type))) {
31 		if (validator(cs, id))
32 			return cs;
33 	}
34 
35 	return NULL;
36 }
37 
38 static bool validate_clock_source_v2(void *p, int id)
39 {
40 	struct uac_clock_source_descriptor *cs = p;
41 	return cs->bClockID == id;
42 }
43 
44 static bool validate_clock_source_v3(void *p, int id)
45 {
46 	struct uac3_clock_source_descriptor *cs = p;
47 	return cs->bClockID == id;
48 }
49 
50 static bool validate_clock_selector_v2(void *p, int id)
51 {
52 	struct uac_clock_selector_descriptor *cs = p;
53 	return cs->bClockID == id;
54 }
55 
56 static bool validate_clock_selector_v3(void *p, int id)
57 {
58 	struct uac3_clock_selector_descriptor *cs = p;
59 	return cs->bClockID == id;
60 }
61 
62 static bool validate_clock_multiplier_v2(void *p, int id)
63 {
64 	struct uac_clock_multiplier_descriptor *cs = p;
65 	return cs->bClockID == id;
66 }
67 
68 static bool validate_clock_multiplier_v3(void *p, int id)
69 {
70 	struct uac3_clock_multiplier_descriptor *cs = p;
71 	return cs->bClockID == id;
72 }
73 
74 #define DEFINE_FIND_HELPER(name, obj, validator, type)		\
75 static obj *name(struct usb_host_interface *iface, int id)	\
76 {								\
77 	return find_uac_clock_desc(iface, id, validator, type);	\
78 }
79 
80 DEFINE_FIND_HELPER(snd_usb_find_clock_source,
81 		   struct uac_clock_source_descriptor,
82 		   validate_clock_source_v2, UAC2_CLOCK_SOURCE);
83 DEFINE_FIND_HELPER(snd_usb_find_clock_source_v3,
84 		   struct uac3_clock_source_descriptor,
85 		   validate_clock_source_v3, UAC3_CLOCK_SOURCE);
86 
87 DEFINE_FIND_HELPER(snd_usb_find_clock_selector,
88 		   struct uac_clock_selector_descriptor,
89 		   validate_clock_selector_v2, UAC2_CLOCK_SELECTOR);
90 DEFINE_FIND_HELPER(snd_usb_find_clock_selector_v3,
91 		   struct uac3_clock_selector_descriptor,
92 		   validate_clock_selector_v3, UAC3_CLOCK_SELECTOR);
93 
94 DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier,
95 		   struct uac_clock_multiplier_descriptor,
96 		   validate_clock_multiplier_v2, UAC2_CLOCK_MULTIPLIER);
97 DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier_v3,
98 		   struct uac3_clock_multiplier_descriptor,
99 		   validate_clock_multiplier_v3, UAC3_CLOCK_MULTIPLIER);
100 
101 static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
102 {
103 	unsigned char buf;
104 	int ret;
105 
106 	ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
107 			      UAC2_CS_CUR,
108 			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
109 			      UAC2_CX_CLOCK_SELECTOR << 8,
110 			      snd_usb_ctrl_intf(chip) | (selector_id << 8),
111 			      &buf, sizeof(buf));
112 
113 	if (ret < 0)
114 		return ret;
115 
116 	return buf;
117 }
118 
119 static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
120 					unsigned char pin)
121 {
122 	int ret;
123 
124 	ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
125 			      UAC2_CS_CUR,
126 			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
127 			      UAC2_CX_CLOCK_SELECTOR << 8,
128 			      snd_usb_ctrl_intf(chip) | (selector_id << 8),
129 			      &pin, sizeof(pin));
130 	if (ret < 0)
131 		return ret;
132 
133 	if (ret != sizeof(pin)) {
134 		usb_audio_err(chip,
135 			"setting selector (id %d) unexpected length %d\n",
136 			selector_id, ret);
137 		return -EINVAL;
138 	}
139 
140 	ret = uac_clock_selector_get_val(chip, selector_id);
141 	if (ret < 0)
142 		return ret;
143 
144 	if (ret != pin) {
145 		usb_audio_err(chip,
146 			"setting selector (id %d) to %x failed (current: %d)\n",
147 			selector_id, pin, ret);
148 		return -EINVAL;
149 	}
150 
151 	return ret;
152 }
153 
154 static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
155 					    const struct audioformat *fmt,
156 					    int source_id)
157 {
158 	bool ret = false;
159 	int count;
160 	unsigned char data;
161 	struct usb_device *dev = chip->dev;
162 
163 	if (fmt->protocol == UAC_VERSION_2) {
164 		struct uac_clock_source_descriptor *cs_desc =
165 			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
166 
167 		if (!cs_desc)
168 			return false;
169 
170 		/*
171 		 * Assume the clock is valid if clock source supports only one
172 		 * single sample rate, the terminal is connected directly to it
173 		 * (there is no clock selector) and clock type is internal.
174 		 * This is to deal with some Denon DJ controllers that always
175 		 * reports that clock is invalid.
176 		 */
177 		if (fmt->nr_rates == 1 &&
178 		    (fmt->clock & 0xff) == cs_desc->bClockID &&
179 		    (cs_desc->bmAttributes & 0x3) !=
180 				UAC_CLOCK_SOURCE_TYPE_EXT)
181 			return true;
182 	}
183 
184 	/*
185 	 * MOTU MicroBook IIc
186 	 * Sample rate changes takes more than 2 seconds for this device. Clock
187 	 * validity request returns false during that period.
188 	 */
189 	if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
190 		count = 0;
191 
192 		while ((!ret) && (count < 50)) {
193 			int err;
194 
195 			msleep(100);
196 
197 			err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
198 					      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
199 					      UAC2_CS_CONTROL_CLOCK_VALID << 8,
200 					      snd_usb_ctrl_intf(chip) | (source_id << 8),
201 					      &data, sizeof(data));
202 			if (err < 0) {
203 				dev_warn(&dev->dev,
204 					 "%s(): cannot get clock validity for id %d\n",
205 					   __func__, source_id);
206 				return false;
207 			}
208 
209 			ret = !!data;
210 			count++;
211 		}
212 	}
213 
214 	return ret;
215 }
216 
217 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
218 				      const struct audioformat *fmt,
219 				      int source_id)
220 {
221 	int err;
222 	unsigned char data;
223 	struct usb_device *dev = chip->dev;
224 	u32 bmControls;
225 
226 	if (fmt->protocol == UAC_VERSION_3) {
227 		struct uac3_clock_source_descriptor *cs_desc =
228 			snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
229 
230 		if (!cs_desc)
231 			return false;
232 		bmControls = le32_to_cpu(cs_desc->bmControls);
233 	} else { /* UAC_VERSION_1/2 */
234 		struct uac_clock_source_descriptor *cs_desc =
235 			snd_usb_find_clock_source(chip->ctrl_intf, source_id);
236 
237 		if (!cs_desc)
238 			return false;
239 		bmControls = cs_desc->bmControls;
240 	}
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(chip) | (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 	struct uac_clock_source_descriptor *source;
271 	struct uac_clock_selector_descriptor *selector;
272 	struct uac_clock_multiplier_descriptor *multiplier;
273 
274 	entity_id &= 0xff;
275 
276 	if (test_and_set_bit(entity_id, visited)) {
277 		usb_audio_warn(chip,
278 			 "%s(): recursive clock topology detected, id %d.\n",
279 			 __func__, entity_id);
280 		return -EINVAL;
281 	}
282 
283 	/* first, see if the ID we're looking for is a clock source already */
284 	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
285 	if (source) {
286 		entity_id = source->bClockID;
287 		if (validate && !uac_clock_source_is_valid(chip, fmt,
288 								entity_id)) {
289 			usb_audio_err(chip,
290 				"clock source %d is not valid, cannot use\n",
291 				entity_id);
292 			return -ENXIO;
293 		}
294 		return entity_id;
295 	}
296 
297 	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
298 	if (selector) {
299 		int ret, i, cur;
300 
301 		if (selector->bNrInPins == 1) {
302 			ret = 1;
303 			goto find_source;
304 		}
305 
306 		/* the entity ID we are looking for is a selector.
307 		 * find out what it currently selects */
308 		ret = uac_clock_selector_get_val(chip, selector->bClockID);
309 		if (ret < 0)
310 			return ret;
311 
312 		/* Selector values are one-based */
313 
314 		if (ret > selector->bNrInPins || ret < 1) {
315 			usb_audio_err(chip,
316 				"%s(): selector reported illegal value, id %d, ret %d\n",
317 				__func__, selector->bClockID, ret);
318 
319 			return -EINVAL;
320 		}
321 
322 	find_source:
323 		cur = ret;
324 		ret = __uac_clock_find_source(chip, fmt,
325 					      selector->baCSourceID[ret - 1],
326 					      visited, validate);
327 		if (!validate || ret > 0 || !chip->autoclock)
328 			return ret;
329 
330 		/* The current clock source is invalid, try others. */
331 		for (i = 1; i <= selector->bNrInPins; i++) {
332 			int err;
333 
334 			if (i == cur)
335 				continue;
336 
337 			ret = __uac_clock_find_source(chip, fmt,
338 						      selector->baCSourceID[i - 1],
339 						      visited, true);
340 			if (ret < 0)
341 				continue;
342 
343 			err = uac_clock_selector_set_val(chip, entity_id, i);
344 			if (err < 0)
345 				continue;
346 
347 			usb_audio_info(chip,
348 				 "found and selected valid clock source %d\n",
349 				 ret);
350 			return ret;
351 		}
352 
353 		return -ENXIO;
354 	}
355 
356 	/* FIXME: multipliers only act as pass-thru element for now */
357 	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
358 	if (multiplier)
359 		return __uac_clock_find_source(chip, fmt,
360 					       multiplier->bCSourceID,
361 					       visited, validate);
362 
363 	return -EINVAL;
364 }
365 
366 static int __uac3_clock_find_source(struct snd_usb_audio *chip,
367 				    const struct audioformat *fmt, int entity_id,
368 				    unsigned long *visited, bool validate)
369 {
370 	struct uac3_clock_source_descriptor *source;
371 	struct uac3_clock_selector_descriptor *selector;
372 	struct uac3_clock_multiplier_descriptor *multiplier;
373 
374 	entity_id &= 0xff;
375 
376 	if (test_and_set_bit(entity_id, visited)) {
377 		usb_audio_warn(chip,
378 			 "%s(): recursive clock topology detected, id %d.\n",
379 			 __func__, entity_id);
380 		return -EINVAL;
381 	}
382 
383 	/* first, see if the ID we're looking for is a clock source already */
384 	source = snd_usb_find_clock_source_v3(chip->ctrl_intf, entity_id);
385 	if (source) {
386 		entity_id = source->bClockID;
387 		if (validate && !uac_clock_source_is_valid(chip, fmt,
388 								entity_id)) {
389 			usb_audio_err(chip,
390 				"clock source %d is not valid, cannot use\n",
391 				entity_id);
392 			return -ENXIO;
393 		}
394 		return entity_id;
395 	}
396 
397 	selector = snd_usb_find_clock_selector_v3(chip->ctrl_intf, entity_id);
398 	if (selector) {
399 		int ret, i, cur;
400 
401 		/* the entity ID we are looking for is a selector.
402 		 * find out what it currently selects */
403 		ret = uac_clock_selector_get_val(chip, selector->bClockID);
404 		if (ret < 0)
405 			return ret;
406 
407 		/* Selector values are one-based */
408 
409 		if (ret > selector->bNrInPins || ret < 1) {
410 			usb_audio_err(chip,
411 				"%s(): selector reported illegal value, id %d, ret %d\n",
412 				__func__, selector->bClockID, ret);
413 
414 			return -EINVAL;
415 		}
416 
417 		cur = ret;
418 		ret = __uac3_clock_find_source(chip, fmt,
419 					       selector->baCSourceID[ret - 1],
420 					       visited, validate);
421 		if (!validate || ret > 0 || !chip->autoclock)
422 			return ret;
423 
424 		/* The current clock source is invalid, try others. */
425 		for (i = 1; i <= selector->bNrInPins; i++) {
426 			int err;
427 
428 			if (i == cur)
429 				continue;
430 
431 			ret = __uac3_clock_find_source(chip, fmt,
432 						       selector->baCSourceID[i - 1],
433 						       visited, true);
434 			if (ret < 0)
435 				continue;
436 
437 			err = uac_clock_selector_set_val(chip, entity_id, i);
438 			if (err < 0)
439 				continue;
440 
441 			usb_audio_info(chip,
442 				 "found and selected valid clock source %d\n",
443 				 ret);
444 			return ret;
445 		}
446 
447 		return -ENXIO;
448 	}
449 
450 	/* FIXME: multipliers only act as pass-thru element for now */
451 	multiplier = snd_usb_find_clock_multiplier_v3(chip->ctrl_intf,
452 						      entity_id);
453 	if (multiplier)
454 		return __uac3_clock_find_source(chip, fmt,
455 						multiplier->bCSourceID,
456 						visited, validate);
457 
458 	return -EINVAL;
459 }
460 
461 /*
462  * For all kinds of sample rate settings and other device queries,
463  * the clock source (end-leaf) must be used. However, clock selectors,
464  * clock multipliers and sample rate converters may be specified as
465  * clock source input to terminal. This functions walks the clock path
466  * to its end and tries to find the source.
467  *
468  * The 'visited' bitfield is used internally to detect recursive loops.
469  *
470  * Returns the clock source UnitID (>=0) on success, or an error.
471  */
472 int snd_usb_clock_find_source(struct snd_usb_audio *chip,
473 			      const struct audioformat *fmt, bool validate)
474 {
475 	DECLARE_BITMAP(visited, 256);
476 	memset(visited, 0, sizeof(visited));
477 
478 	switch (fmt->protocol) {
479 	case UAC_VERSION_2:
480 		return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
481 					       validate);
482 	case UAC_VERSION_3:
483 		return __uac3_clock_find_source(chip, fmt, fmt->clock, visited,
484 					       validate);
485 	default:
486 		return -EINVAL;
487 	}
488 }
489 
490 static int set_sample_rate_v1(struct snd_usb_audio *chip,
491 			      const struct audioformat *fmt, int rate)
492 {
493 	struct usb_device *dev = chip->dev;
494 	unsigned char data[3];
495 	int err, crate;
496 
497 	/* if endpoint doesn't have sampling rate control, bail out */
498 	if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
499 		return 0;
500 
501 	data[0] = rate;
502 	data[1] = rate >> 8;
503 	data[2] = rate >> 16;
504 	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
505 			      USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
506 			      UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
507 			      fmt->endpoint, data, sizeof(data));
508 	if (err < 0) {
509 		dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
510 			fmt->iface, fmt->altsetting, rate, fmt->endpoint);
511 		return err;
512 	}
513 
514 	/* Don't check the sample rate for devices which we know don't
515 	 * support reading */
516 	if (snd_usb_get_sample_rate_quirk(chip))
517 		return 0;
518 	/* the firmware is likely buggy, don't repeat to fail too many times */
519 	if (chip->sample_rate_read_error > 2)
520 		return 0;
521 
522 	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
523 			      USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
524 			      UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
525 			      fmt->endpoint, data, sizeof(data));
526 	if (err < 0) {
527 		dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
528 			fmt->iface, fmt->altsetting, fmt->endpoint);
529 		chip->sample_rate_read_error++;
530 		return 0; /* some devices don't support reading */
531 	}
532 
533 	crate = data[0] | (data[1] << 8) | (data[2] << 16);
534 	if (!crate) {
535 		dev_info(&dev->dev, "failed to read current rate; disabling the check\n");
536 		chip->sample_rate_read_error = 3; /* three strikes, see above */
537 		return 0;
538 	}
539 
540 	if (crate != rate) {
541 		dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
542 		// runtime->rate = crate;
543 	}
544 
545 	return 0;
546 }
547 
548 static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
549 			      int altsetting, int clock)
550 {
551 	struct usb_device *dev = chip->dev;
552 	__le32 data;
553 	int err;
554 
555 	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
556 			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
557 			      UAC2_CS_CONTROL_SAM_FREQ << 8,
558 			      snd_usb_ctrl_intf(chip) | (clock << 8),
559 			      &data, sizeof(data));
560 	if (err < 0) {
561 		dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n",
562 			 iface, altsetting, err);
563 		return 0;
564 	}
565 
566 	return le32_to_cpu(data);
567 }
568 
569 /*
570  * Try to set the given sample rate:
571  *
572  * Return 0 if the clock source is read-only, the actual rate on success,
573  * or a negative error code.
574  *
575  * This function gets called from format.c to validate each sample rate, too.
576  * Hence no message is shown upon error
577  */
578 int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
579 				 const struct audioformat *fmt,
580 				 int clock, int rate)
581 {
582 	bool writeable;
583 	u32 bmControls;
584 	__le32 data;
585 	int err;
586 
587 	if (fmt->protocol == UAC_VERSION_3) {
588 		struct uac3_clock_source_descriptor *cs_desc;
589 
590 		cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
591 		bmControls = le32_to_cpu(cs_desc->bmControls);
592 	} else {
593 		struct uac_clock_source_descriptor *cs_desc;
594 
595 		cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
596 		bmControls = cs_desc->bmControls;
597 	}
598 
599 	writeable = uac_v2v3_control_is_writeable(bmControls,
600 						  UAC2_CS_CONTROL_SAM_FREQ);
601 	if (!writeable)
602 		return 0;
603 
604 	data = cpu_to_le32(rate);
605 	err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
606 			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
607 			      UAC2_CS_CONTROL_SAM_FREQ << 8,
608 			      snd_usb_ctrl_intf(chip) | (clock << 8),
609 			      &data, sizeof(data));
610 	if (err < 0)
611 		return err;
612 
613 	return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
614 }
615 
616 static int set_sample_rate_v2v3(struct snd_usb_audio *chip,
617 				const struct audioformat *fmt, int rate)
618 {
619 	int cur_rate, prev_rate;
620 	int clock;
621 
622 	/* First, try to find a valid clock. This may trigger
623 	 * automatic clock selection if the current clock is not
624 	 * valid.
625 	 */
626 	clock = snd_usb_clock_find_source(chip, fmt, true);
627 	if (clock < 0) {
628 		/* We did not find a valid clock, but that might be
629 		 * because the current sample rate does not match an
630 		 * external clock source. Try again without validation
631 		 * and we will do another validation after setting the
632 		 * rate.
633 		 */
634 		clock = snd_usb_clock_find_source(chip, fmt, false);
635 		if (clock < 0)
636 			return clock;
637 	}
638 
639 	prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
640 	if (prev_rate == rate)
641 		goto validation;
642 
643 	cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate);
644 	if (cur_rate < 0) {
645 		usb_audio_err(chip,
646 			      "%d:%d: cannot set freq %d (v2/v3): err %d\n",
647 			      fmt->iface, fmt->altsetting, rate, cur_rate);
648 		return cur_rate;
649 	}
650 
651 	if (!cur_rate)
652 		cur_rate = prev_rate;
653 
654 	if (cur_rate != rate) {
655 		usb_audio_dbg(chip,
656 			      "%d:%d: freq mismatch: req %d, clock runs @%d\n",
657 			      fmt->iface, fmt->altsetting, rate, cur_rate);
658 		/* continue processing */
659 	}
660 
661 validation:
662 	/* validate clock after rate change */
663 	if (!uac_clock_source_is_valid(chip, fmt, clock))
664 		return -ENXIO;
665 	return 0;
666 }
667 
668 int snd_usb_init_sample_rate(struct snd_usb_audio *chip,
669 			     const struct audioformat *fmt, int rate)
670 {
671 	usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n",
672 		      fmt->iface, fmt->altsetting, rate, fmt->clock);
673 
674 	switch (fmt->protocol) {
675 	case UAC_VERSION_1:
676 	default:
677 		return set_sample_rate_v1(chip, fmt, rate);
678 
679 	case UAC_VERSION_3:
680 		if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
681 			if (rate != UAC3_BADD_SAMPLING_RATE)
682 				return -ENXIO;
683 			else
684 				return 0;
685 		}
686 		fallthrough;
687 	case UAC_VERSION_2:
688 		return set_sample_rate_v2v3(chip, fmt, rate);
689 	}
690 }
691 
692