linux-kernel - [PATCH v2] ALSA: usb-audio: Add DSD support for iBasso DC04U

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Message-ID:
 <TYYPR01MB14098529E0BD900921BE6F42CF465A@TYYPR01MB14098.jpnprd01.prod.outlook.com>
Date: Mon,  9 Feb 2026 18:04:18 +0800
From: Qihang Guo <v-conet@...look.com>
To: Takashi Iwai <tiwai@...e.com>
Cc: Jaroslav Kysela <perex@...ex.cz>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	V-Conet <v-conet@...look.com>
Subject: [PATCH v2] ALSA: usb-audio: Add DSD support for iBasso DC04U

From: V-Conet <v-conet@...look.com>

Vendor ID 0x0661 is assigned to Hamamatsu Photonics K.K.,
but is used by iBasso for iBasso DC04U (0x0661:0x0883),
which supports native DSD playback.

This patch adds QUIRK_FLAG_DSD_RAW for iBasso DC04U, enabling
native DSD playback (DSD_U32_BE). The change has been verified
on Arch Linux using mpd and pw-cat.

Signed-off-by: Qihang Guo <v-conet@...look.com>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 2d9f28558..d550c84e7 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2236,6 +2236,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 	DEVICE_FLG(0x0644, 0x806c, /* Esoteric XD */
 		   QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY |
 		   QUIRK_FLAG_IFACE_DELAY | QUIRK_FLAG_FORCE_IFACE_RESET),
+	DEVICE_FLG(0x0661, 0x0883, /* iBasso DC04 Ultra */
+		   QUIRK_FLAG_DSD_RAW),
 	DEVICE_FLG(0x06f8, 0xb000, /* Hercules DJ Console (Windows Edition) */
 		   QUIRK_FLAG_IGNORE_CTL_ERROR),
 	DEVICE_FLG(0x06f8, 0xd002, /* Hercules DJ Console (Macintosh Edition) */
-- 
2.53.0