summaryrefslogtreecommitdiff
path: root/sound/hda/hdac_stream.c
blob: d01e691391648c43703eef7c818669fa8db098b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
// SPDX-License-Identifier: GPL-2.0-only
/*
 * HD-audio stream operations
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/clocksource.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/hdaudio.h>
#include <sound/hda_register.h>
#include "trace.h"

/**
 * snd_hdac_get_stream_stripe_ctl - get stripe control value
 * @bus: HD-audio core bus
 * @substream: PCM substream
 */
int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
				   struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int channels = runtime->channels,
		     rate = runtime->rate,
		     bits_per_sample = runtime->sample_bits,
		     max_sdo_lines, value, sdo_line;

	/* T_AZA_GCAP_NSDO is 1:2 bitfields in GCAP */
	max_sdo_lines = snd_hdac_chip_readl(bus, GCAP) & AZX_GCAP_NSDO;

	/* following is from HD audio spec */
	for (sdo_line = max_sdo_lines; sdo_line > 0; sdo_line >>= 1) {
		if (rate > 48000)
			value = (channels * bits_per_sample *
					(rate / 48000)) / sdo_line;
		else
			value = (channels * bits_per_sample) / sdo_line;

		if (value >= 8)
			break;
	}

	/* stripe value: 0 for 1SDO, 1 for 2SDO, 2 for 4SDO lines */
	return sdo_line >> 1;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_stream_stripe_ctl);

/**
 * snd_hdac_stream_init - initialize each stream (aka device)
 * @bus: HD-audio core bus
 * @azx_dev: HD-audio core stream object to initialize
 * @idx: stream index number
 * @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
 * @tag: the tag id to assign
 *
 * Assign the starting bdl address to each stream (device) and initialize.
 */
void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
			  int idx, int direction, int tag)
{
	azx_dev->bus = bus;
	/* offset: SDI0=0x80, SDI1=0xa0, ... SDO3=0x160 */
	azx_dev->sd_addr = bus->remap_addr + (0x20 * idx + 0x80);
	/* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */
	azx_dev->sd_int_sta_mask = 1 << idx;
	azx_dev->index = idx;
	azx_dev->direction = direction;
	azx_dev->stream_tag = tag;
	snd_hdac_dsp_lock_init(azx_dev);
	list_add_tail(&azx_dev->list, &bus->stream_list);
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_init);

/**
 * snd_hdac_stream_start - start a stream
 * @azx_dev: HD-audio core stream to start
 * @fresh_start: false = wallclock timestamp relative to period wallclock
 *
 * Start a stream, set start_wallclk and set the running flag.
 */
void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
{
	struct hdac_bus *bus = azx_dev->bus;
	int stripe_ctl;

	trace_snd_hdac_stream_start(bus, azx_dev);

	azx_dev->start_wallclk = snd_hdac_chip_readl(bus, WALLCLK);
	if (!fresh_start)
		azx_dev->start_wallclk -= azx_dev->period_wallclk;

	/* enable SIE */
	snd_hdac_chip_updatel(bus, INTCTL,
			      1 << azx_dev->index,
			      1 << azx_dev->index);
	/* set stripe control */
	if (azx_dev->stripe) {
		if (azx_dev->substream)
			stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
		else
			stripe_ctl = 0;
		snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK,
					stripe_ctl);
	}
	/* set DMA start and interrupt mask */
	snd_hdac_stream_updateb(azx_dev, SD_CTL,
				0, SD_CTL_DMA_START | SD_INT_MASK);
	azx_dev->running = true;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_start);

/**
 * snd_hdac_stream_clear - stop a stream DMA
 * @azx_dev: HD-audio core stream to stop
 */
void snd_hdac_stream_clear(struct hdac_stream *azx_dev)
{
	snd_hdac_stream_updateb(azx_dev, SD_CTL,
				SD_CTL_DMA_START | SD_INT_MASK, 0);
	snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); /* to be sure */
	if (azx_dev->stripe)
		snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK, 0);
	azx_dev->running = false;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_clear);

/**
 * snd_hdac_stream_stop - stop a stream
 * @azx_dev: HD-audio core stream to stop
 *
 * Stop a stream DMA and disable stream interrupt
 */
void snd_hdac_stream_stop(struct hdac_stream *azx_dev)
{
	trace_snd_hdac_stream_stop(azx_dev->bus, azx_dev);

	snd_hdac_stream_clear(azx_dev);
	/* disable SIE */
	snd_hdac_chip_updatel(azx_dev->bus, INTCTL, 1 << azx_dev->index, 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_stop);

/**
 * snd_hdac_stream_reset - reset a stream
 * @azx_dev: HD-audio core stream to reset
 */
void snd_hdac_stream_reset(struct hdac_stream *azx_dev)
{
	unsigned char val;
	int timeout;

	snd_hdac_stream_clear(azx_dev);

	snd_hdac_stream_updateb(azx_dev, SD_CTL, 0, SD_CTL_STREAM_RESET);
	udelay(3);
	timeout = 300;
	do {
		val = snd_hdac_stream_readb(azx_dev, SD_CTL) &
			SD_CTL_STREAM_RESET;
		if (val)
			break;
	} while (--timeout);
	val &= ~SD_CTL_STREAM_RESET;
	snd_hdac_stream_writeb(azx_dev, SD_CTL, val);
	udelay(3);

	timeout = 300;
	/* waiting for hardware to report that the stream is out of reset */
	do {
		val = snd_hdac_stream_readb(azx_dev, SD_CTL) &
			SD_CTL_STREAM_RESET;
		if (!val)
			break;
	} while (--timeout);

	/* reset first position - may not be synced with hw at this time */
	if (azx_dev->posbuf)
		*azx_dev->posbuf = 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_reset);

/**
 * snd_hdac_stream_setup -  set up the SD for streaming
 * @azx_dev: HD-audio core stream to set up
 */
int snd_hdac_stream_setup(struct hdac_stream *azx_dev)
{
	struct hdac_bus *bus = azx_dev->bus;
	struct snd_pcm_runtime *runtime;
	unsigned int val;

	if (azx_dev->substream)
		runtime = azx_dev->substream->runtime;
	else
		runtime = NULL;
	/* make sure the run bit is zero for SD */
	snd_hdac_stream_clear(azx_dev);
	/* program the stream_tag */
	val = snd_hdac_stream_readl(azx_dev, SD_CTL);
	val = (val & ~SD_CTL_STREAM_TAG_MASK) |
		(azx_dev->stream_tag << SD_CTL_STREAM_TAG_SHIFT);
	if (!bus->snoop)
		val |= SD_CTL_TRAFFIC_PRIO;
	snd_hdac_stream_writel(azx_dev, SD_CTL, val);

	/* program the length of samples in cyclic buffer */
	snd_hdac_stream_writel(azx_dev, SD_CBL, azx_dev->bufsize);

	/* program the stream format */
	/* this value needs to be the same as the one programmed */
	snd_hdac_stream_writew(azx_dev, SD_FORMAT, azx_dev->format_val);

	/* program the stream LVI (last valid index) of the BDL */
	snd_hdac_stream_writew(azx_dev, SD_LVI, azx_dev->frags - 1);

	/* program the BDL address */
	/* lower BDL address */
	snd_hdac_stream_writel(azx_dev, SD_BDLPL, (u32)azx_dev->bdl.addr);
	/* upper BDL address */
	snd_hdac_stream_writel(azx_dev, SD_BDLPU,
			       upper_32_bits(azx_dev->bdl.addr));

	/* enable the position buffer */
	if (bus->use_posbuf && bus->posbuf.addr) {
		if (!(snd_hdac_chip_readl(bus, DPLBASE) & AZX_DPLBASE_ENABLE))
			snd_hdac_chip_writel(bus, DPLBASE,
				(u32)bus->posbuf.addr | AZX_DPLBASE_ENABLE);
	}

	/* set the interrupt enable bits in the descriptor control register */
	snd_hdac_stream_updatel(azx_dev, SD_CTL, 0, SD_INT_MASK);

	azx_dev->fifo_size = snd_hdac_stream_readw(azx_dev, SD_FIFOSIZE) + 1;

	/* when LPIB delay correction gives a small negative value,
	 * we ignore it; currently set the threshold statically to
	 * 64 frames
	 */
	if (runtime && runtime->period_size > 64)
		azx_dev->delay_negative_threshold =
			-frames_to_bytes(runtime, 64);
	else
		azx_dev->delay_negative_threshold = 0;

	/* wallclk has 24Mhz clock source */
	if (runtime)
		azx_dev->period_wallclk = (((runtime->period_size * 24000) /
				    runtime->rate) * 1000);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_setup);

/**
 * snd_hdac_stream_cleanup - cleanup a stream
 * @azx_dev: HD-audio core stream to clean up
 */
void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev)
{
	snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0);
	snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0);
	snd_hdac_stream_writel(azx_dev, SD_CTL, 0);
	azx_dev->bufsize = 0;
	azx_dev->period_bytes = 0;
	azx_dev->format_val = 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_cleanup);

/**
 * snd_hdac_stream_assign - assign a stream for the PCM
 * @bus: HD-audio core bus
 * @substream: PCM substream to assign
 *
 * Look for an unused stream for the given PCM substream, assign it
 * and return the stream object.  If no stream is free, returns NULL.
 * The function tries to keep using the same stream object when it's used
 * beforehand.  Also, when bus->reverse_assign flag is set, the last free
 * or matching entry is returned.  This is needed for some strange codecs.
 */
struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
					   struct snd_pcm_substream *substream)
{
	struct hdac_stream *azx_dev;
	struct hdac_stream *res = NULL;

	/* make a non-zero unique key for the substream */
	int key = (substream->pcm->device << 16) | (substream->number << 2) |
		(substream->stream + 1);

	list_for_each_entry(azx_dev, &bus->stream_list, list) {
		if (azx_dev->direction != substream->stream)
			continue;
		if (azx_dev->opened)
			continue;
		if (azx_dev->assigned_key == key) {
			res = azx_dev;
			break;
		}
		if (!res || bus->reverse_assign)
			res = azx_dev;
	}
	if (res) {
		spin_lock_irq(&bus->reg_lock);
		res->opened = 1;
		res->running = 0;
		res->assigned_key = key;
		res->substream = substream;
		spin_unlock_irq(&bus->reg_lock);
	}
	return res;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_assign);

/**
 * snd_hdac_stream_release - release the assigned stream
 * @azx_dev: HD-audio core stream to release
 *
 * Release the stream that has been assigned by snd_hdac_stream_assign().
 */
void snd_hdac_stream_release(struct hdac_stream *azx_dev)
{
	struct hdac_bus *bus = azx_dev->bus;

	spin_lock_irq(&bus->reg_lock);
	azx_dev->opened = 0;
	azx_dev->running = 0;
	azx_dev->substream = NULL;
	spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_release);

/**
 * snd_hdac_get_stream - return hdac_stream based on stream_tag and
 * direction
 *
 * @bus: HD-audio core bus
 * @dir: direction for the stream to be found
 * @stream_tag: stream tag for stream to be found
 */
struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus,
					int dir, int stream_tag)
{
	struct hdac_stream *s;

	list_for_each_entry(s, &bus->stream_list, list) {
		if (s->direction == dir && s->stream_tag == stream_tag)
			return s;
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_stream);

/*
 * set up a BDL entry
 */
static int setup_bdle(struct hdac_bus *bus,
		      struct snd_dma_buffer *dmab,
		      struct hdac_stream *azx_dev, __le32 **bdlp,
		      int ofs, int size, int with_ioc)
{
	__le32 *bdl = *bdlp;

	while (size > 0) {
		dma_addr_t addr;
		int chunk;

		if (azx_dev->frags >= AZX_MAX_BDL_ENTRIES)
			return -EINVAL;

		addr = snd_sgbuf_get_addr(dmab, ofs);
		/* program the address field of the BDL entry */
		bdl[0] = cpu_to_le32((u32)addr);
		bdl[1] = cpu_to_le32(upper_32_bits(addr));
		/* program the size field of the BDL entry */
		chunk = snd_sgbuf_get_chunk_size(dmab, ofs, size);
		/* one BDLE cannot cross 4K boundary on CTHDA chips */
		if (bus->align_bdle_4k) {
			u32 remain = 0x1000 - (ofs & 0xfff);

			if (chunk > remain)
				chunk = remain;
		}
		bdl[2] = cpu_to_le32(chunk);
		/* program the IOC to enable interrupt
		 * only when the whole fragment is processed
		 */
		size -= chunk;
		bdl[3] = (size || !with_ioc) ? 0 : cpu_to_le32(0x01);
		bdl += 4;
		azx_dev->frags++;
		ofs += chunk;
	}
	*bdlp = bdl;
	return ofs;
}

/**
 * snd_hdac_stream_setup_periods - set up BDL entries
 * @azx_dev: HD-audio core stream to set up
 *
 * Set up the buffer descriptor table of the given stream based on the
 * period and buffer sizes of the assigned PCM substream.
 */
int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev)
{
	struct hdac_bus *bus = azx_dev->bus;
	struct snd_pcm_substream *substream = azx_dev->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	__le32 *bdl;
	int i, ofs, periods, period_bytes;
	int pos_adj, pos_align;

	/* reset BDL address */
	snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0);
	snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0);

	period_bytes = azx_dev->period_bytes;
	periods = azx_dev->bufsize / period_bytes;

	/* program the initial BDL entries */
	bdl = (__le32 *)azx_dev->bdl.area;
	ofs = 0;
	azx_dev->frags = 0;

	pos_adj = bus->bdl_pos_adj;
	if (!azx_dev->no_period_wakeup && pos_adj > 0) {
		pos_align = pos_adj;
		pos_adj = (pos_adj * runtime->rate + 47999) / 48000;
		if (!pos_adj)
			pos_adj = pos_align;
		else
			pos_adj = ((pos_adj + pos_align - 1) / pos_align) *
				pos_align;
		pos_adj = frames_to_bytes(runtime, pos_adj);
		if (pos_adj >= period_bytes) {
			dev_warn(bus->dev, "Too big adjustment %d\n",
				 pos_adj);
			pos_adj = 0;
		} else {
			ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream),
					 azx_dev,
					 &bdl, ofs, pos_adj, true);
			if (ofs < 0)
				goto error;
		}
	} else
		pos_adj = 0;

	for (i = 0; i < periods; i++) {
		if (i == periods - 1 && pos_adj)
			ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream),
					 azx_dev, &bdl, ofs,
					 period_bytes - pos_adj, 0);
		else
			ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream),
					 azx_dev, &bdl, ofs,
					 period_bytes,
					 !azx_dev->no_period_wakeup);
		if (ofs < 0)
			goto error;
	}
	return 0;

 error:
	dev_err(bus->dev, "Too many BDL entries: buffer=%d, period=%d\n",
		azx_dev->bufsize, period_bytes);
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods);

/**
 * snd_hdac_stream_set_params - set stream parameters
 * @azx_dev: HD-audio core stream for which parameters are to be set
 * @format_val: format value parameter
 *
 * Setup the HD-audio core stream parameters from substream of the stream
 * and passed format value
 */
int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
				 unsigned int format_val)
{

	unsigned int bufsize, period_bytes;
	struct snd_pcm_substream *substream = azx_dev->substream;
	struct snd_pcm_runtime *runtime;
	int err;

	if (!substream)
		return -EINVAL;
	runtime = substream->runtime;
	bufsize = snd_pcm_lib_buffer_bytes(substream);
	period_bytes = snd_pcm_lib_period_bytes(substream);

	if (bufsize != azx_dev->bufsize ||
	    period_bytes != azx_dev->period_bytes ||
	    format_val != azx_dev->format_val ||
	    runtime->no_period_wakeup != azx_dev->no_period_wakeup) {
		azx_dev->bufsize = bufsize;
		azx_dev->period_bytes = period_bytes;
		azx_dev->format_val = format_val;
		azx_dev->no_period_wakeup = runtime->no_period_wakeup;
		err = snd_hdac_stream_setup_periods(azx_dev);
		if (err < 0)
			return err;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_set_params);

static u64 azx_cc_read(const struct cyclecounter *cc)
{
	struct hdac_stream *azx_dev = container_of(cc, struct hdac_stream, cc);

	return snd_hdac_chip_readl(azx_dev->bus, WALLCLK);
}

static void azx_timecounter_init(struct hdac_stream *azx_dev,
				 bool force, u64 last)
{
	struct timecounter *tc = &azx_dev->tc;
	struct cyclecounter *cc = &azx_dev->cc;
	u64 nsec;

	cc->read = azx_cc_read;
	cc->mask = CLOCKSOURCE_MASK(32);

	/*
	 * Converting from 24 MHz to ns means applying a 125/3 factor.
	 * To avoid any saturation issues in intermediate operations,
	 * the 125 factor is applied first. The division is applied
	 * last after reading the timecounter value.
	 * Applying the 1/3 factor as part of the multiplication
	 * requires at least 20 bits for a decent precision, however
	 * overflows occur after about 4 hours or less, not a option.
	 */

	cc->mult = 125; /* saturation after 195 years */
	cc->shift = 0;

	nsec = 0; /* audio time is elapsed time since trigger */
	timecounter_init(tc, cc, nsec);
	if (force) {
		/*
		 * force timecounter to use predefined value,
		 * used for synchronized starts
		 */
		tc->cycle_last = last;
	}
}

/**
 * snd_hdac_stream_timecounter_init - initialize time counter
 * @azx_dev: HD-audio core stream (master stream)
 * @streams: bit flags of streams to set up
 *
 * Initializes the time counter of streams marked by the bit flags (each
 * bit corresponds to the stream index).
 * The trigger timestamp of PCM substream assigned to the given stream is
 * updated accordingly, too.
 */
void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
				      unsigned int streams)
{
	struct hdac_bus *bus = azx_dev->bus;
	struct snd_pcm_runtime *runtime = azx_dev->substream->runtime;
	struct hdac_stream *s;
	bool inited = false;
	u64 cycle_last = 0;
	int i = 0;

	list_for_each_entry(s, &bus->stream_list, list) {
		if (streams & (1 << i)) {
			azx_timecounter_init(s, inited, cycle_last);
			if (!inited) {
				inited = true;
				cycle_last = s->tc.cycle_last;
			}
		}
		i++;
	}

	snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
	runtime->trigger_tstamp_latched = true;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_timecounter_init);

/**
 * snd_hdac_stream_sync_trigger - turn on/off stream sync register
 * @azx_dev: HD-audio core stream (master stream)
 * @set: true = set, false = clear
 * @streams: bit flags of streams to sync
 * @reg: the stream sync register address
 */
void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
				  unsigned int streams, unsigned int reg)
{
	struct hdac_bus *bus = azx_dev->bus;
	unsigned int val;

	if (!reg)
		reg = AZX_REG_SSYNC;
	val = _snd_hdac_chip_readl(bus, reg);
	if (set)
		val |= streams;
	else
		val &= ~streams;
	_snd_hdac_chip_writel(bus, reg, val);
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_sync_trigger);

/**
 * snd_hdac_stream_sync - sync with start/strop trigger operation
 * @azx_dev: HD-audio core stream (master stream)
 * @start: true = start, false = stop
 * @streams: bit flags of streams to sync
 *
 * For @start = true, wait until all FIFOs get ready.
 * For @start = false, wait until all RUN bits are cleared.
 */
void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
			  unsigned int streams)
{
	struct hdac_bus *bus = azx_dev->bus;
	int i, nwait, timeout;
	struct hdac_stream *s;

	for (timeout = 5000; timeout; timeout--) {
		nwait = 0;
		i = 0;
		list_for_each_entry(s, &bus->stream_list, list) {
			if (streams & (1 << i)) {
				if (start) {
					/* check FIFO gets ready */
					if (!(snd_hdac_stream_readb(s, SD_STS) &
					      SD_STS_FIFO_READY))
						nwait++;
				} else {
					/* check RUN bit is cleared */
					if (snd_hdac_stream_readb(s, SD_CTL) &
					    SD_CTL_DMA_START)
						nwait++;
				}
			}
			i++;
		}
		if (!nwait)
			break;
		cpu_relax();
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_sync);

#ifdef CONFIG_SND_HDA_DSP_LOADER
/**
 * snd_hdac_dsp_prepare - prepare for DSP loading
 * @azx_dev: HD-audio core stream used for DSP loading
 * @format: HD-audio stream format
 * @byte_size: data chunk byte size
 * @bufp: allocated buffer
 *
 * Allocate the buffer for the given size and set up the given stream for
 * DSP loading.  Returns the stream tag (>= 0), or a negative error code.
 */
int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
			 unsigned int byte_size, struct snd_dma_buffer *bufp)
{
	struct hdac_bus *bus = azx_dev->bus;
	__le32 *bdl;
	int err;

	snd_hdac_dsp_lock(azx_dev);
	spin_lock_irq(&bus->reg_lock);
	if (azx_dev->running || azx_dev->locked) {
		spin_unlock_irq(&bus->reg_lock);
		err = -EBUSY;
		goto unlock;
	}
	azx_dev->locked = true;
	spin_unlock_irq(&bus->reg_lock);

	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, bus->dev,
				  byte_size, bufp);
	if (err < 0)
		goto err_alloc;

	azx_dev->substream = NULL;
	azx_dev->bufsize = byte_size;
	azx_dev->period_bytes = byte_size;
	azx_dev->format_val = format;

	snd_hdac_stream_reset(azx_dev);

	/* reset BDL address */
	snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0);
	snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0);

	azx_dev->frags = 0;
	bdl = (__le32 *)azx_dev->bdl.area;
	err = setup_bdle(bus, bufp, azx_dev, &bdl, 0, byte_size, 0);
	if (err < 0)
		goto error;

	snd_hdac_stream_setup(azx_dev);
	snd_hdac_dsp_unlock(azx_dev);
	return azx_dev->stream_tag;

 error:
	snd_dma_free_pages(bufp);
 err_alloc:
	spin_lock_irq(&bus->reg_lock);
	azx_dev->locked = false;
	spin_unlock_irq(&bus->reg_lock);
 unlock:
	snd_hdac_dsp_unlock(azx_dev);
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_dsp_prepare);

/**
 * snd_hdac_dsp_trigger - start / stop DSP loading
 * @azx_dev: HD-audio core stream used for DSP loading
 * @start: trigger start or stop
 */
void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
{
	if (start)
		snd_hdac_stream_start(azx_dev, true);
	else
		snd_hdac_stream_stop(azx_dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_dsp_trigger);

/**
 * snd_hdac_dsp_cleanup - clean up the stream from DSP loading to normal
 * @azx_dev: HD-audio core stream used for DSP loading
 * @dmab: buffer used by DSP loading
 */
void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
			  struct snd_dma_buffer *dmab)
{
	struct hdac_bus *bus = azx_dev->bus;

	if (!dmab->area || !azx_dev->locked)
		return;

	snd_hdac_dsp_lock(azx_dev);
	/* reset BDL address */
	snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0);
	snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0);
	snd_hdac_stream_writel(azx_dev, SD_CTL, 0);
	azx_dev->bufsize = 0;
	azx_dev->period_bytes = 0;
	azx_dev->format_val = 0;

	snd_dma_free_pages(dmab);
	dmab->area = NULL;

	spin_lock_irq(&bus->reg_lock);
	azx_dev->locked = false;
	spin_unlock_irq(&bus->reg_lock);
	snd_hdac_dsp_unlock(azx_dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_dsp_cleanup);
#endif /* CONFIG_SND_HDA_DSP_LOADER */