ALSA: usb-audio: Add native DSD quirk for HiBy FC4

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The HiBy FC4 with USB ID 32bb:0004 advertises its native DSD
stream as UAC2 RAW_DATA with a 4-byte, 32-bit subslot. Without a
quirk snd-usb-audio leaves this alternate setting as
SNDRV_PCM_FORMAT_SPECIAL, so userspace cannot select a native DSD
format.

Mark the device with QUIRK_FLAG_DSD_RAW so the existing generic raw
DSD handling exposes the stream as DSD_U32_BE.

Tested on an FC4 at DSD256. With the quirk the playback alternate
setting changes from SPECIAL to DSD_U32_BE and reports DOP=0,
bitrev=0; native DSD256 playback works correctly.

Signed-off-by: Achilles Zhang <bnqzzdf@gmail.com>
Link: https://patch.msgid.link/20260921024344.391912-1-bnqzzdf@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Achilles Zhang 2026-09-21 10:43:43 +08:00 • committed by Takashi Iwai

parent f4b506f735

commit d24b03248a

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sound/usb/quirks.c

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