[PATCH 4/9] ALSA: usb-audio: Disable low-latency playback for free-wheel mode

[Takashi Iwai <tiwai@suse.de>]

The free-wheel stream operation like dmix may not update the appl_ptr
appropriately, and it doesn't fit with the low-latency playback mode.
Disable the low-latency playback operation when the stream is set up
in such a mode.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/usb/pcm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 4dd7f1c9e2af..84b03a32ee23 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -582,7 +582,8 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 }
 
 /* check whether early start is needed for playback stream */
-static int lowlatency_playback_available(struct snd_usb_substream *subs)
+static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
+					 struct snd_usb_substream *subs)
 {
 	struct snd_usb_audio *chip = subs->stream->chip;
 
@@ -591,6 +592,9 @@ static int lowlatency_playback_available(struct snd_usb_substream *subs)
 	/* disabled via module option? */
 	if (!chip->lowlatency)
 		return false;
+	/* free-wheeling mode? (e.g. dmix) */
+	if (runtime->stop_threshold > runtime->buffer_size)
+		return false;
 	/* too short periods? */
 	if (subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes)
 		return false;
@@ -630,7 +634,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 	subs->period_elapsed_pending = 0;
 	runtime->delay = 0;
 
-	subs->lowlatency_playback = lowlatency_playback_available(subs);
+	subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
 	if (!subs->lowlatency_playback)
 		ret = start_endpoints(subs);
 
-- 
2.26.2