diff options
| author | Takashi Iwai <tiwai@suse.de> | 2021-08-29 09:38:30 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-08-29 09:41:27 +0200 |
| commit | 4801bee7d5a36c199b734a28cde5259183aff822 (patch) | |
| tree | 106e13cacf6d6263316ff0147734465037e90cd8 /sound/usb/pcm.c | |
| parent | 4267c5a8f3133db0572cd9abee059b42cafbbdad (diff) | |
ALSA: usb-audio: Add lowlatency module option
For making user to switch back to the old playback mode, this patch
adds a new module option 'lowlatency' to snd-usb-audio driver.
When user face a regression due to the recent low-latency playback
support, they can test easily by passing lowlatency=0 option without
rebuilding the kernel.
Fixes: 307cc9baac5c ("ALSA: usb-audio: Reduce latency at playback start, take#2")
Link: https://lore.kernel.org/r/20210829073830.22686-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/pcm.c')
| -rw-r--r-- | sound/usb/pcm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index f5cbf61ac366..5dc9266180e3 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -617,7 +617,8 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) /* check whether early start is needed for playback stream */ subs->early_playback_start = subs->direction == SNDRV_PCM_STREAM_PLAYBACK && - subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes; + (!chip->lowlatency || + (subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes)); if (subs->early_playback_start) ret = start_endpoints(subs); |