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Diffstat (limited to 'sound/usb/pcm.c')
-rw-r--r--sound/usb/pcm.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 0d8aba5fe1a8..b4ef410e5a98 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1464,6 +1464,14 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
+ if (subs->trigger_tstamp_pending_update) {
+ /* this is the first actual URB submitted,
+ * update trigger timestamp to reflect actual start time
+ */
+ snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
+ subs->trigger_tstamp_pending_update = false;
+ }
+
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = bytes;
if (period_elapsed)
@@ -1550,6 +1558,7 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
+ subs->trigger_tstamp_pending_update = true;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
subs->data_endpoint->retire_data_urb = retire_playback_urb;