diff options
Diffstat (limited to 'sound/usb/pcm.c')
| -rw-r--r-- | sound/usb/pcm.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 95ec8eec1bb0..cec6e91afea2 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -581,6 +581,12 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream) return 0; } +/* free-wheeling mode? (e.g. dmix) */ +static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime) +{ + return runtime->stop_threshold > runtime->buffer_size; +} + /* check whether early start is needed for playback stream */ static int lowlatency_playback_available(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) @@ -592,8 +598,7 @@ static int lowlatency_playback_available(struct snd_pcm_runtime *runtime, /* disabled via module option? */ if (!chip->lowlatency) return false; - /* free-wheeling mode? (e.g. dmix) */ - if (runtime->stop_threshold > runtime->buffer_size) + if (in_free_wheeling_mode(runtime)) return false; /* implicit feedback mode has own operation mode */ if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) @@ -635,7 +640,8 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) runtime->delay = 0; subs->lowlatency_playback = lowlatency_playback_available(runtime, subs); - if (!subs->lowlatency_playback) + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && + !subs->lowlatency_playback) ret = start_endpoints(subs); unlock: @@ -1552,6 +1558,8 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea subs); if (subs->lowlatency_playback && cmd == SNDRV_PCM_TRIGGER_START) { + if (in_free_wheeling_mode(substream->runtime)) + subs->lowlatency_playback = false; err = start_endpoints(subs); if (err < 0) { snd_usb_endpoint_set_callback(subs->data_endpoint, |