2011/5/24 Takashi Iwai tiwai@suse.de:
ALSA hda_intel.c:1680: azx_pcm_prepare: bufsize=0x1aeb00, format=0x4111 ... ALSA pcm_native.c:1531: playback drain error (DMA or IRQ trouble?)
Wouldn't it be better to fix the PCM timeout itself? Does the patch below work?
thanks,
Takashi
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index abfeff16..a754722 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1756,8 +1756,16 @@ static int wait_for_avail(struct snd_pcm_substream *substream, wait_queue_t wait; int err = 0; snd_pcm_uframes_t avail = 0;
- long wait_time = 10; /* 10 seconds timeout as default */
long tout;
- if (runtime->rate) {
- long t = (runtime->period_size * 2 + runtime->rate - 1) /
- runtime->rate;
- wait_time = max(t, wait_time);
- }
- wait_time = msecs_to_jiffies(wait_time * 1000);
init_waitqueue_entry(&wait, current); add_wait_queue(&runtime->tsleep, &wait); for (;;) { @@ -1767,7 +1775,7 @@ static int wait_for_avail(struct snd_pcm_substream *substream, } set_current_state(TASK_INTERRUPTIBLE); snd_pcm_stream_unlock_irq(substream);
- tout = schedule_timeout(msecs_to_jiffies(10000));
- tout = schedule_timeout(wait_time);
snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_SUSPENDED:
you patch only fix the playback write/capture read error .
does it mean that even when the application (e.g. PA server) set stop_threshold to boundary can only freerun for 10 seconds only ?
The drain error in pcm_native.c still occur when application use a period time longer than 10 seconds and some of the audio signal at the end seem lost in snd_pcm_drain()
tout = schedule_timeout(10 * HZ);
...
if (tout == 0) { if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) result = -ESTRPIPE; else { snd_printd("playback drain error (DMA or IRQ trouble?)\n"); snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); result = -EIO; } break; }