Commit | Line | Data |
---|---|---|
31ef9134 CL |
1 | /* |
2 | * Audio and Music Data Transmission Protocol (IEC 61883-6) streams | |
3 | * with Common Isochronous Packet (IEC 61883-1) headers | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Licensed under the terms of the GNU General Public License, version 2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/firewire.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <sound/pcm.h> | |
15 | #include "amdtp.h" | |
16 | ||
17 | #define TICKS_PER_CYCLE 3072 | |
18 | #define CYCLES_PER_SECOND 8000 | |
19 | #define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) | |
20 | ||
21 | #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ | |
22 | ||
23 | #define TAG_CIP 1 | |
24 | ||
25 | #define CIP_EOH (1u << 31) | |
26 | #define CIP_FMT_AM (0x10 << 24) | |
27 | #define AMDTP_FDF_AM824 (0 << 19) | |
28 | #define AMDTP_FDF_SFC_SHIFT 16 | |
29 | ||
30 | /* TODO: make these configurable */ | |
31 | #define INTERRUPT_INTERVAL 16 | |
32 | #define QUEUE_LENGTH 48 | |
33 | ||
34 | /** | |
35 | * amdtp_out_stream_init - initialize an AMDTP output stream structure | |
36 | * @s: the AMDTP output stream to initialize | |
37 | * @unit: the target of the stream | |
38 | * @flags: the packet transmission method to use | |
39 | */ | |
40 | int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit, | |
41 | enum cip_out_flags flags) | |
42 | { | |
43 | if (flags != CIP_NONBLOCKING) | |
44 | return -EINVAL; | |
45 | ||
46 | s->unit = fw_unit_get(unit); | |
47 | s->flags = flags; | |
48 | s->context = ERR_PTR(-1); | |
49 | mutex_init(&s->mutex); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL(amdtp_out_stream_init); | |
54 | ||
55 | /** | |
56 | * amdtp_out_stream_destroy - free stream resources | |
57 | * @s: the AMDTP output stream to destroy | |
58 | */ | |
59 | void amdtp_out_stream_destroy(struct amdtp_out_stream *s) | |
60 | { | |
61 | WARN_ON(!IS_ERR(s->context)); | |
62 | mutex_destroy(&s->mutex); | |
63 | fw_unit_put(s->unit); | |
64 | } | |
65 | EXPORT_SYMBOL(amdtp_out_stream_destroy); | |
66 | ||
67 | /** | |
68 | * amdtp_out_stream_set_rate - set the sample rate | |
69 | * @s: the AMDTP output stream to configure | |
70 | * @rate: the sample rate | |
71 | * | |
72 | * The sample rate must be set before the stream is started, and must not be | |
73 | * changed while the stream is running. | |
74 | */ | |
75 | void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate) | |
76 | { | |
77 | static const struct { | |
78 | unsigned int rate; | |
79 | unsigned int syt_interval; | |
80 | } rate_info[] = { | |
81 | [CIP_SFC_32000] = { 32000, 8, }, | |
82 | [CIP_SFC_44100] = { 44100, 8, }, | |
83 | [CIP_SFC_48000] = { 48000, 8, }, | |
84 | [CIP_SFC_88200] = { 88200, 16, }, | |
85 | [CIP_SFC_96000] = { 96000, 16, }, | |
86 | [CIP_SFC_176400] = { 176400, 32, }, | |
87 | [CIP_SFC_192000] = { 192000, 32, }, | |
88 | }; | |
89 | unsigned int sfc; | |
90 | ||
91 | if (WARN_ON(!IS_ERR(s->context))) | |
92 | return; | |
93 | ||
94 | for (sfc = 0; sfc < ARRAY_SIZE(rate_info); ++sfc) | |
95 | if (rate_info[sfc].rate == rate) { | |
96 | s->sfc = sfc; | |
97 | s->syt_interval = rate_info[sfc].syt_interval; | |
98 | return; | |
99 | } | |
100 | WARN_ON(1); | |
101 | } | |
102 | EXPORT_SYMBOL(amdtp_out_stream_set_rate); | |
103 | ||
104 | /** | |
105 | * amdtp_out_stream_get_max_payload - get the stream's packet size | |
106 | * @s: the AMDTP output stream | |
107 | * | |
108 | * This function must not be called before the stream has been configured | |
109 | * with amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and | |
110 | * amdtp_out_stream_set_midi(). | |
111 | */ | |
112 | unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s) | |
113 | { | |
114 | static const unsigned int max_data_blocks[] = { | |
115 | [CIP_SFC_32000] = 4, | |
116 | [CIP_SFC_44100] = 6, | |
117 | [CIP_SFC_48000] = 6, | |
118 | [CIP_SFC_88200] = 12, | |
119 | [CIP_SFC_96000] = 12, | |
120 | [CIP_SFC_176400] = 23, | |
121 | [CIP_SFC_192000] = 24, | |
122 | }; | |
123 | ||
124 | s->data_block_quadlets = s->pcm_channels; | |
125 | s->data_block_quadlets += DIV_ROUND_UP(s->midi_ports, 8); | |
126 | ||
127 | return 8 + max_data_blocks[s->sfc] * 4 * s->data_block_quadlets; | |
128 | } | |
129 | EXPORT_SYMBOL(amdtp_out_stream_get_max_payload); | |
130 | ||
131 | static void amdtp_write_s16(struct amdtp_out_stream *s, | |
132 | struct snd_pcm_substream *pcm, | |
133 | __be32 *buffer, unsigned int frames); | |
134 | static void amdtp_write_s32(struct amdtp_out_stream *s, | |
135 | struct snd_pcm_substream *pcm, | |
136 | __be32 *buffer, unsigned int frames); | |
137 | ||
138 | /** | |
139 | * amdtp_out_stream_set_pcm_format - set the PCM format | |
140 | * @s: the AMDTP output stream to configure | |
141 | * @format: the format of the ALSA PCM device | |
142 | * | |
143 | * The sample format must be set before the stream is started, and must not be | |
144 | * changed while the stream is running. | |
145 | */ | |
146 | void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s, | |
147 | snd_pcm_format_t format) | |
148 | { | |
149 | if (WARN_ON(!IS_ERR(s->context))) | |
150 | return; | |
151 | ||
152 | switch (format) { | |
153 | default: | |
154 | WARN_ON(1); | |
155 | /* fall through */ | |
156 | case SNDRV_PCM_FORMAT_S16: | |
157 | s->transfer_samples = amdtp_write_s16; | |
158 | break; | |
159 | case SNDRV_PCM_FORMAT_S32: | |
160 | s->transfer_samples = amdtp_write_s32; | |
161 | break; | |
162 | } | |
163 | } | |
164 | EXPORT_SYMBOL(amdtp_out_stream_set_pcm_format); | |
165 | ||
166 | static unsigned int calculate_data_blocks(struct amdtp_out_stream *s) | |
167 | { | |
168 | unsigned int phase, data_blocks; | |
169 | ||
170 | if (!cip_sfc_is_base_44100(s->sfc)) { | |
171 | /* Sample_rate / 8000 is an integer, and precomputed. */ | |
172 | data_blocks = s->data_block_state; | |
173 | } else { | |
174 | phase = s->data_block_state; | |
175 | ||
176 | /* | |
177 | * This calculates the number of data blocks per packet so that | |
178 | * 1) the overall rate is correct and exactly synchronized to | |
179 | * the bus clock, and | |
180 | * 2) packets with a rounded-up number of blocks occur as early | |
181 | * as possible in the sequence (to prevent underruns of the | |
182 | * device's buffer). | |
183 | */ | |
184 | if (s->sfc == CIP_SFC_44100) | |
185 | /* 6 6 5 6 5 6 5 ... */ | |
186 | data_blocks = 5 + ((phase & 1) ^ | |
187 | (phase == 0 || phase >= 40)); | |
188 | else | |
189 | /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ | |
190 | data_blocks = 11 * (s->sfc >> 1) + (phase == 0); | |
191 | if (++phase >= (80 >> (s->sfc >> 1))) | |
192 | phase = 0; | |
193 | s->data_block_state = phase; | |
194 | } | |
195 | ||
196 | return data_blocks; | |
197 | } | |
198 | ||
199 | static unsigned int calculate_syt(struct amdtp_out_stream *s, | |
200 | unsigned int cycle) | |
201 | { | |
202 | unsigned int syt_offset, phase, index, syt; | |
203 | ||
204 | if (s->last_syt_offset < TICKS_PER_CYCLE) { | |
205 | if (!cip_sfc_is_base_44100(s->sfc)) | |
206 | syt_offset = s->last_syt_offset + s->syt_offset_state; | |
207 | else { | |
208 | /* | |
209 | * The time, in ticks, of the n'th SYT_INTERVAL sample is: | |
210 | * n * SYT_INTERVAL * 24576000 / sample_rate | |
211 | * Modulo TICKS_PER_CYCLE, the difference between successive | |
212 | * elements is about 1386.23. Rounding the results of this | |
213 | * formula to the SYT precision results in a sequence of | |
214 | * differences that begins with: | |
215 | * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... | |
216 | * This code generates _exactly_ the same sequence. | |
217 | */ | |
218 | phase = s->syt_offset_state; | |
219 | index = phase % 13; | |
220 | syt_offset = s->last_syt_offset; | |
221 | syt_offset += 1386 + ((index && !(index & 3)) || | |
222 | phase == 146); | |
223 | if (++phase >= 147) | |
224 | phase = 0; | |
225 | s->syt_offset_state = phase; | |
226 | } | |
227 | } else | |
228 | syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; | |
229 | s->last_syt_offset = syt_offset; | |
230 | ||
231 | syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; | |
232 | syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; | |
233 | syt += syt_offset % TICKS_PER_CYCLE; | |
234 | ||
235 | return syt & 0xffff; | |
236 | } | |
237 | ||
238 | static void amdtp_write_s32(struct amdtp_out_stream *s, | |
239 | struct snd_pcm_substream *pcm, | |
240 | __be32 *buffer, unsigned int frames) | |
241 | { | |
242 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
243 | unsigned int channels, remaining_frames, frame_step, i, c; | |
244 | const u32 *src; | |
245 | ||
246 | channels = s->pcm_channels; | |
247 | src = (void *)runtime->dma_area + | |
248 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
249 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
250 | frame_step = s->data_block_quadlets - channels; | |
251 | ||
252 | for (i = 0; i < frames; ++i) { | |
253 | for (c = 0; c < channels; ++c) { | |
254 | *buffer = cpu_to_be32((*src >> 8) | 0x40000000); | |
255 | src++; | |
256 | buffer++; | |
257 | } | |
258 | buffer += frame_step; | |
259 | if (--remaining_frames == 0) | |
260 | src = (void *)runtime->dma_area; | |
261 | } | |
262 | } | |
263 | ||
264 | static void amdtp_write_s16(struct amdtp_out_stream *s, | |
265 | struct snd_pcm_substream *pcm, | |
266 | __be32 *buffer, unsigned int frames) | |
267 | { | |
268 | struct snd_pcm_runtime *runtime = pcm->runtime; | |
269 | unsigned int channels, remaining_frames, frame_step, i, c; | |
270 | const u16 *src; | |
271 | ||
272 | channels = s->pcm_channels; | |
273 | src = (void *)runtime->dma_area + | |
274 | s->pcm_buffer_pointer * (runtime->frame_bits / 8); | |
275 | remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; | |
276 | frame_step = s->data_block_quadlets - channels; | |
277 | ||
278 | for (i = 0; i < frames; ++i) { | |
279 | for (c = 0; c < channels; ++c) { | |
280 | *buffer = cpu_to_be32((*src << 8) | 0x40000000); | |
281 | src++; | |
282 | buffer++; | |
283 | } | |
284 | buffer += frame_step; | |
285 | if (--remaining_frames == 0) | |
286 | src = (void *)runtime->dma_area; | |
287 | } | |
288 | } | |
289 | ||
290 | static void amdtp_fill_pcm_silence(struct amdtp_out_stream *s, | |
291 | __be32 *buffer, unsigned int frames) | |
292 | { | |
293 | unsigned int i, c; | |
294 | ||
295 | for (i = 0; i < frames; ++i) { | |
296 | for (c = 0; c < s->pcm_channels; ++c) | |
297 | buffer[c] = cpu_to_be32(0x40000000); | |
298 | buffer += s->data_block_quadlets; | |
299 | } | |
300 | } | |
301 | ||
302 | static void amdtp_fill_midi(struct amdtp_out_stream *s, | |
303 | __be32 *buffer, unsigned int frames) | |
304 | { | |
305 | unsigned int i; | |
306 | ||
307 | for (i = 0; i < frames; ++i) | |
308 | buffer[s->pcm_channels + i * s->data_block_quadlets] = | |
309 | cpu_to_be32(0x80000000); | |
310 | } | |
311 | ||
312 | static void queue_out_packet(struct amdtp_out_stream *s, unsigned int cycle) | |
313 | { | |
314 | __be32 *buffer; | |
315 | unsigned int data_blocks, syt, ptr; | |
316 | struct snd_pcm_substream *pcm; | |
317 | struct fw_iso_packet packet; | |
318 | int err; | |
319 | ||
320 | data_blocks = calculate_data_blocks(s); | |
321 | syt = calculate_syt(s, cycle); | |
322 | ||
323 | buffer = s->buffer.packets[s->packet_counter].buffer; | |
324 | buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | | |
325 | (s->data_block_quadlets << 16) | | |
326 | s->data_block_counter); | |
327 | buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | | |
328 | (s->sfc << AMDTP_FDF_SFC_SHIFT) | syt); | |
329 | buffer += 2; | |
330 | ||
331 | pcm = ACCESS_ONCE(s->pcm); | |
332 | if (pcm) | |
333 | s->transfer_samples(s, pcm, buffer, data_blocks); | |
334 | else | |
335 | amdtp_fill_pcm_silence(s, buffer, data_blocks); | |
336 | if (s->midi_ports) | |
337 | amdtp_fill_midi(s, buffer, data_blocks); | |
338 | ||
339 | s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; | |
340 | ||
341 | packet.payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; | |
342 | packet.interrupt = IS_ALIGNED(s->packet_counter + 1, | |
343 | INTERRUPT_INTERVAL); | |
344 | packet.skip = 0; | |
345 | packet.tag = TAG_CIP; | |
346 | packet.sy = 0; | |
347 | packet.header_length = 0; | |
348 | ||
349 | err = fw_iso_context_queue(s->context, &packet, &s->buffer.iso_buffer, | |
350 | s->buffer.packets[s->packet_counter].offset); | |
351 | if (err < 0) | |
352 | dev_err(&s->unit->device, "queueing error: %d\n", err); | |
353 | ||
354 | if (++s->packet_counter >= QUEUE_LENGTH) | |
355 | s->packet_counter = 0; | |
356 | ||
357 | if (pcm) { | |
358 | ptr = s->pcm_buffer_pointer + data_blocks; | |
359 | if (ptr >= pcm->runtime->buffer_size) | |
360 | ptr -= pcm->runtime->buffer_size; | |
361 | ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; | |
362 | ||
363 | s->pcm_period_pointer += data_blocks; | |
364 | if (s->pcm_period_pointer >= pcm->runtime->period_size) { | |
365 | s->pcm_period_pointer -= pcm->runtime->period_size; | |
366 | snd_pcm_period_elapsed(pcm); | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | static void out_packet_callback(struct fw_iso_context *context, u32 cycle, | |
372 | size_t header_length, void *header, void *data) | |
373 | { | |
374 | struct amdtp_out_stream *s = data; | |
375 | unsigned int i, packets = header_length / 4; | |
376 | ||
377 | /* | |
378 | * Compute the cycle of the last queued packet. | |
379 | * (We need only the four lowest bits for the SYT, so we can ignore | |
380 | * that bits 0-11 must wrap around at 3072.) | |
381 | */ | |
382 | cycle += QUEUE_LENGTH - packets; | |
383 | ||
384 | for (i = 0; i < packets; ++i) | |
385 | queue_out_packet(s, ++cycle); | |
386 | } | |
387 | ||
388 | static int queue_initial_skip_packets(struct amdtp_out_stream *s) | |
389 | { | |
390 | struct fw_iso_packet skip_packet = { | |
391 | .skip = 1, | |
392 | }; | |
393 | unsigned int i; | |
394 | int err; | |
395 | ||
396 | for (i = 0; i < QUEUE_LENGTH; ++i) { | |
397 | skip_packet.interrupt = IS_ALIGNED(s->packet_counter + 1, | |
398 | INTERRUPT_INTERVAL); | |
399 | err = fw_iso_context_queue(s->context, &skip_packet, NULL, 0); | |
400 | if (err < 0) | |
401 | return err; | |
402 | if (++s->packet_counter >= QUEUE_LENGTH) | |
403 | s->packet_counter = 0; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | /** | |
410 | * amdtp_out_stream_start - start sending packets | |
411 | * @s: the AMDTP output stream to start | |
412 | * @channel: the isochronous channel on the bus | |
413 | * @speed: firewire speed code | |
414 | * | |
415 | * The stream cannot be started until it has been configured with | |
416 | * amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and | |
417 | * amdtp_out_stream_set_midi(); and it must be started before any | |
418 | * PCM or MIDI device can be started. | |
419 | */ | |
420 | int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed) | |
421 | { | |
422 | static const struct { | |
423 | unsigned int data_block; | |
424 | unsigned int syt_offset; | |
425 | } initial_state[] = { | |
426 | [CIP_SFC_32000] = { 4, 3072 }, | |
427 | [CIP_SFC_48000] = { 6, 1024 }, | |
428 | [CIP_SFC_96000] = { 12, 1024 }, | |
429 | [CIP_SFC_192000] = { 24, 1024 }, | |
430 | [CIP_SFC_44100] = { 0, 67 }, | |
431 | [CIP_SFC_88200] = { 0, 67 }, | |
432 | [CIP_SFC_176400] = { 0, 67 }, | |
433 | }; | |
434 | int err; | |
435 | ||
436 | mutex_lock(&s->mutex); | |
437 | ||
438 | if (WARN_ON(!IS_ERR(s->context) || | |
439 | (!s->pcm_channels && !s->midi_ports))) { | |
440 | err = -EBADFD; | |
441 | goto err_unlock; | |
442 | } | |
443 | ||
444 | s->data_block_state = initial_state[s->sfc].data_block; | |
445 | s->syt_offset_state = initial_state[s->sfc].syt_offset; | |
446 | s->last_syt_offset = TICKS_PER_CYCLE; | |
447 | ||
448 | err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, | |
449 | amdtp_out_stream_get_max_payload(s), | |
450 | DMA_TO_DEVICE); | |
451 | if (err < 0) | |
452 | goto err_unlock; | |
453 | ||
454 | s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, | |
455 | FW_ISO_CONTEXT_TRANSMIT, | |
456 | channel, speed, 0, | |
457 | out_packet_callback, s); | |
458 | if (IS_ERR(s->context)) { | |
459 | err = PTR_ERR(s->context); | |
460 | if (err == -EBUSY) | |
461 | dev_err(&s->unit->device, | |
462 | "no free output stream on this controller\n"); | |
463 | goto err_buffer; | |
464 | } | |
465 | ||
466 | amdtp_out_stream_update(s); | |
467 | ||
468 | s->packet_counter = 0; | |
469 | s->data_block_counter = 0; | |
470 | err = queue_initial_skip_packets(s); | |
471 | if (err < 0) | |
472 | goto err_context; | |
473 | ||
474 | err = fw_iso_context_start(s->context, -1, 0, 0); | |
475 | if (err < 0) | |
476 | goto err_context; | |
477 | ||
478 | mutex_unlock(&s->mutex); | |
479 | ||
480 | return 0; | |
481 | ||
482 | err_context: | |
483 | fw_iso_context_destroy(s->context); | |
484 | s->context = ERR_PTR(-1); | |
485 | err_buffer: | |
486 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
487 | err_unlock: | |
488 | mutex_unlock(&s->mutex); | |
489 | ||
490 | return err; | |
491 | } | |
492 | EXPORT_SYMBOL(amdtp_out_stream_start); | |
493 | ||
494 | /** | |
495 | * amdtp_out_stream_update - update the stream after a bus reset | |
496 | * @s: the AMDTP output stream | |
497 | */ | |
498 | void amdtp_out_stream_update(struct amdtp_out_stream *s) | |
499 | { | |
500 | ACCESS_ONCE(s->source_node_id_field) = | |
501 | (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; | |
502 | } | |
503 | EXPORT_SYMBOL(amdtp_out_stream_update); | |
504 | ||
505 | /** | |
506 | * amdtp_out_stream_stop - stop sending packets | |
507 | * @s: the AMDTP output stream to stop | |
508 | * | |
509 | * All PCM and MIDI devices of the stream must be stopped before the stream | |
510 | * itself can be stopped. | |
511 | */ | |
512 | void amdtp_out_stream_stop(struct amdtp_out_stream *s) | |
513 | { | |
514 | mutex_lock(&s->mutex); | |
515 | ||
516 | if (IS_ERR(s->context)) { | |
517 | mutex_unlock(&s->mutex); | |
518 | return; | |
519 | } | |
520 | ||
521 | fw_iso_context_stop(s->context); | |
522 | fw_iso_context_destroy(s->context); | |
523 | s->context = ERR_PTR(-1); | |
524 | iso_packets_buffer_destroy(&s->buffer, s->unit); | |
525 | ||
526 | mutex_unlock(&s->mutex); | |
527 | } | |
528 | EXPORT_SYMBOL(amdtp_out_stream_stop); | |
529 | ||
530 | /** | |
531 | * amdtp_out_stream_pcm_abort - abort the running PCM device | |
532 | * @s: the AMDTP stream about to be stopped | |
533 | * | |
534 | * If the isochronous stream needs to be stopped asynchronously, call this | |
535 | * function first to stop the PCM device. | |
536 | */ | |
537 | void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s) | |
538 | { | |
539 | struct snd_pcm_substream *pcm; | |
540 | ||
541 | pcm = ACCESS_ONCE(s->pcm); | |
542 | if (pcm) { | |
543 | snd_pcm_stream_lock_irq(pcm); | |
544 | if (snd_pcm_running(pcm)) | |
545 | snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); | |
546 | snd_pcm_stream_unlock_irq(pcm); | |
547 | } | |
548 | } | |
549 | EXPORT_SYMBOL(amdtp_out_stream_pcm_abort); |