Currently ALSA core blocks userspace for about 10 seconds for PCM R/W IO.
This needs to be configurable for modern hardware like DSPs where no
pointer update in milliseconds can indicate terminal DSP errors.
Add a substream variable to set the wait time in ms. This allows userspace
and drivers to recover more quickly from terminal DSP errors.
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
/* -- timer section -- */
struct snd_timer *timer; /* timer */
unsigned timer_running: 1; /* time is running */
+ long wait_time; /* time in ms for R/W to wait for avail */
/* -- next substream -- */
struct snd_pcm_substream *next;
/* -- linked substreams -- */
if (runtime->no_period_wakeup)
wait_time = MAX_SCHEDULE_TIMEOUT;
else {
- wait_time = 10;
- if (runtime->rate) {
- long t = runtime->period_size * 2 / runtime->rate;
- wait_time = max(t, wait_time);
+ /* use wait time from substream if available */
+ if (substream->wait_time) {
+ wait_time = substream->wait_time;
+ } else {
+ wait_time = 10;
+
+ if (runtime->rate) {
+ long t = runtime->period_size * 2 /
+ runtime->rate;
+ wait_time = max(t, wait_time);
+ }
+ wait_time = msecs_to_jiffies(wait_time * 1000);
}
- wait_time = msecs_to_jiffies(wait_time * 1000);
}
for (;;) {