ALSA: pcm: allow for trigger_tstamp snapshot in .trigger

Don't use generic snapshot of trigger_tstamp if low-level driver or
hardware can get a more precise value for better audio/system time
synchronization.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 07299b295233..c0ddb7e69c28 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -285,6 +285,7 @@ struct snd_pcm_runtime {
         /* -- Status -- */
         struct snd_pcm_substream *trigger_master;
         struct timespec trigger_tstamp; /* trigger timestamp */
+        bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
         int overrange;
         snd_pcm_uframes_t avail_max;
         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */