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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>
This commit is contained in:
Achilles Zhang 2026-09-21 10:43:43 +08:00 committed by Takashi Iwai
parent f4b506f735
commit d24b03248a
1 changed files with 2 additions and 0 deletions
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2
sound/usb/quirks.c
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@ -2542,6 +2542,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
QUIRK_FLAG_IGNORE_CTL_ERROR),
DEVICE_FLG(0x3255, 0x0000, /* Luxman D-10X */
QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY),
DEVICE_FLG(0x32bb, 0x0004, /* HiBy FC4 */
QUIRK_FLAG_DSD_RAW),
DEVICE_FLG(0x3302, 0x17c2, /* TTGK Technology USB-C Audio */
QUIRK_FLAG_FORCE_IFACE_RESET | QUIRK_FLAG_IFACE_DELAY),
DEVICE_FLG(0x339b, 0x3a07, /* Synaptics HONOR USB-C HEADSET */