sound/usb/clock.c

21 #include "clock.h"
165 		 * Assume the clock is valid if clock source supports only one
167 		 * (there is no clock selector) and clock type is internal.
169 		 * reports that clock is invalid.
172 		    (fmt->clock & 0xff) == cs_desc->v2.bClockID &&
198 					 "%s(): cannot get clock validity for id %d\n",
230 	/* If a clock source can't tell us whether it's valid, we assume it is */
243 			 "%s(): cannot get clock validity for id %d\n",
271 			 "%s(): recursive clock topology detected, id %d.\n",
276 	/* first, see if the ID we're looking at is a clock source already */
283 				"clock source %d is not valid, cannot use\n",
315 				"%s(): clock selector control is not readable, id %d\n",
345 			/* Skip setting clock selector again for some devices */
369 		/* The current clock source is invalid, try others. */
385 				 "found and selected valid clock source %d\n",
405  * the clock source (end-leaf) must be used. However, clock selectors,
406  * clock multipliers and sample rate converters may be specified as
407  * clock source input to terminal. This functions walks the clock path
412  * Returns the clock source UnitID (>=0) on success, or an error.
423 		return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
489 			      int altsetting, int clock)
498 			      snd_usb_ctrl_intf(chip) | (clock << 8),
512  * Return 0 if the clock source is read-only, the actual rate on success,
520 				 int clock, int rate)
528 	cs_desc = snd_usb_find_clock_source(chip, clock, fmt->protocol);
547 			      snd_usb_ctrl_intf(chip) | (clock << 8),
552 	return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
559 	int clock;
561 	/* First, try to find a valid clock. This may trigger
562 	 * automatic clock selection if the current clock is not
565 	clock = snd_usb_clock_find_source(chip, fmt, true);
566 	if (clock < 0) {
567 		/* We did not find a valid clock, but that might be
569 		 * external clock source. Try again without validation
573 		clock = snd_usb_clock_find_source(chip, fmt, false);
579 		if (clock < 0)
580 			return clock;
583 	prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
587 	cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate);
600 			      "%d:%d: freq mismatch: req %d, clock runs @%d\n",
617 	/* validate clock after rate change */
618 	if (!uac_clock_source_is_valid(chip, fmt, clock))
626 	usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n",
627 		      fmt->iface, fmt->altsetting, rate, fmt->clock);