[PATCH] ALSA: usb-audio: Add DSD support for Comtrue USB Audio device

[noble228@gmail.com]

From: "noble.yang" <noble.yang@comtrue-inc.com>

The vendor Comtrue Inc. (0x2fc6) produces USB audio chipsets like
the CT7601 which are capable of Native DSD playback.

This patch adds QUIRK_FLAG_DSD_RAW for Comtrue (VID 0x2fc6), which enables
native DSD playback (DSD_U32_LE) on their USB Audio device. This has been
verified under Ubuntu 25.04 with JRiver.


Signed-off-by: noble.yang <noble.yang@comtrue-inc.com>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index bd24f3a78ea9..cbb66125f839 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2408,6 +2408,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_DSD_RAW),
 	VENDOR_FLG(0x2d87, /* Cayin device */
 		   QUIRK_FLAG_DSD_RAW),
+ 	VENDOR_FLG(0x2fc6, /* Comture-inc devices */
+		   QUIRK_FLAG_DSD_RAW),	   
 	VENDOR_FLG(0x3336, /* HEM devices */
 		   QUIRK_FLAG_DSD_RAW),
 	VENDOR_FLG(0x3353, /* Khadas devices */
-- 
2.48.1