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ALSA: usb-audio: Disable low-latency mode for implicit feedback sync
When a playback stream runs in the implicit feedback mode, its operation is passive and won't start unless the capture packet is received. This behavior contradicts with the low-latency playback mode, and we should turn off lowlatency_playback flag accordingly. In theory, we may take the low-latency mode when the playback-first quirk is set, but it still conflicts with the later operation with the fixed packet numbers, so it's disabled all together for now. Link: https://lore.kernel.org/r/20210929080844.11583-6-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -595,6 +595,9 @@ static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
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/* free-wheeling mode? (e.g. dmix) */
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if (runtime->stop_threshold > runtime->buffer_size)
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return false;
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/* implicit feedback mode has own operation mode */
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if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint))
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return false;
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/* too short periods? */
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if (subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes)
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return false;
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