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ALSA: doc: usb-audio: Add doc for QUIRK_FLAG_IFB_SILENCE_ON_EMPTY

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QUIRK_FLAG_IFB_SILENCE_ON_EMPTY was introduced into usb-audio before
without appropriate documentation, so add it.

Fixes: a238120042 ("ALSA: usb-audio: add IFB_SILENCE_ON_EMPTY quirk for Behringer Flow 8")
Signed-off-by: Rong Zhang <i@rong.moe>
Link: https://patch.msgid.link/20260527-uac-quirk-get-cur-vol-v1-1-e9362b712e5e@rong.moe
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Rong Zhang 2026-05-27 01:49:23 +08:00 committed by Takashi Iwai
parent b2e9d2cbbb
commit 06363f96e3
1 changed files with 6 additions and 0 deletions
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6
Documentation/sound/alsa-configuration.rst
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@ -2383,6 +2383,12 @@ quirk_flags
``V(x) = k * x``; ``dB(x) = 20 * log10(x)``. Overrides bit 24
* bit 28: ``mixer_capture_linear_vol``
Similar to bit 27 but for capture streams. Overrides bit 25
* bit 29: ``ifb_silence_on_empty``
In implicit feedback mode, when an entire capture URB returns with
all iso_frame_desc[i].status != 0 (bytes==0), do not silently return
from snd_usb_handle_sync_urb. Instead fall through and enqueue a
packet_info containing only size-0 packets, so the OUT ring keeps
moving (emits silence). Needed by Behringer Flow 8 (1397:050c).
This module supports multiple devices, autoprobe and hotplugging.