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Diffstat (limited to 'sound/usb/pcm.c')
-rw-r--r--sound/usb/pcm.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index e26d37365f02..4e5031a68064 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -611,13 +611,9 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
subs->hwptr_done = 0;
subs->transfer_done = 0;
subs->last_frame_number = 0;
+ subs->period_elapsed_pending = 0;
runtime->delay = 0;
- /* for playback, submit the URBs now; otherwise, the first hwptr_done
- * updates for all URBs would happen at the same time when starting */
- if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
- ret = start_endpoints(subs);
-
unlock:
snd_usb_unlock_shutdown(chip);
return ret;
@@ -1398,6 +1394,10 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
subs->trigger_tstamp_pending_update = false;
}
+ if (period_elapsed && !subs->running) {
+ subs->period_elapsed_pending = 1;
+ period_elapsed = 0;
+ }
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = bytes;
if (period_elapsed)
@@ -1413,6 +1413,7 @@ static void retire_playback_urb(struct snd_usb_substream *subs,
{
unsigned long flags;
struct snd_urb_ctx *ctx = urb->context;
+ bool period_elapsed = false;
spin_lock_irqsave(&subs->lock, flags);
if (ctx->queued) {
@@ -1423,13 +1424,20 @@ static void retire_playback_urb(struct snd_usb_substream *subs,
}
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
+ if (subs->running) {
+ period_elapsed = subs->period_elapsed_pending;
+ subs->period_elapsed_pending = 0;
+ }
spin_unlock_irqrestore(&subs->lock, flags);
+ if (period_elapsed)
+ snd_pcm_period_elapsed(subs->pcm_substream);
}
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
+ int err;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
@@ -1440,6 +1448,14 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea
prepare_playback_urb,
retire_playback_urb,
subs);
+ if (cmd == SNDRV_PCM_TRIGGER_START) {
+ err = start_endpoints(subs);
+ if (err < 0) {
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL, NULL, NULL);
+ return err;
+ }
+ }
subs->running = 1;
dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
subs->cur_audiofmt->iface,