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

From: Takashi Iwai
Date: Thu Jul 31 2025 - 01:52:08 EST

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On Thu, 31 Jul 2025 07:50:13 +0200,
<noble.yang@xxxxxxxxxxxxxxx> wrote:
>
> Hello Takashi
>
> Please try download it as below link
> https://reurl.cc/8951Ro

You can't submit like this style. Please try to submit in the proper
format embedded in the email.

thanks,

Takashi

>
> Thanks
> Noble
>
> -----Original Message-----
> From: Takashi Iwai <tiwai@xxxxxxx>
> Sent: Thursday, July 31, 2025 1:40 PM
> To: noble.yang@xxxxxxxxxxxxxxx
> Cc: tiwai@xxxxxxxx; perex@xxxxxxxx; hulianqin@xxxxxxxx;
> lina+kernel@xxxxxxxxxxxxx; cyan.vtb@xxxxxxxxx; dan.carpenter@xxxxxxxxxx;
> bsevens@xxxxxxxxxx; linux-sound@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] ALSA: usb-audio: Add DSD support for Comtrue USB Audio
> device
>
> On Thu, 31 Jul 2025 06:51:37 +0200,
> <noble.yang@xxxxxxxxxxxxxxx> wrote:
> >
> >
> > 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.
> >
> > Best Regards !
>
> I see no patch in the mail. Could you try to send via git-send-email?
>
>
> thanks,
>
> Takashi
>
> >
> > ===========================
> >
> > Noble Yang
> >
> > Cell : +886-955-347822
> >
> > 晨臻股份有限公司
> >
> > Comtrue Inc.
> >
> > www.comtrue-inc.com
> >
> > 新地址 : 新竹縣竹北市縣政十街10號2F之1
> >
> > 2F.-1, No. 10, Xianzheng 10th St., Zhubei City, Hsinchu County 302,
> > Taiwan
> > (R.O.C.)
> >
> > The information included in this email is privileged and confidential
> > and just for the exclusive use of the addressee.
> >
> > For people other than the addressee the use, disclosure and
> > reproduction is strictly prohibited.
> >
> > If this message has been received in error, please contact the sender
> > and delete all copies.
> >
> >
> > cat /proc/asound/card*/stream0
> > Comtrue-inc Comtrue-inc UAC2 Device EVM-GB at usb-0000:00:14.0-5, high
> > speed : USB Audio
> >
> > Playback:
> > Status: Stop
> > Interface 1
> > Altset 1
> > Format: S16_LE
> > Channels: 2
> > Endpoint: 0x01 (1 OUT) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 16
> > Channel map: FL FR
> > Sync Endpoint: 0x81 (1 IN)
> > Sync EP Interface: 1
> > Sync EP Altset: 1
> > Implicit Feedback Mode: No
> > Interface 1
> > Altset 2
> > Format: S24_3LE
> > Channels: 2
> > Endpoint: 0x01 (1 OUT) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 24
> > Channel map: FL FR
> > Sync Endpoint: 0x81 (1 IN)
> > Sync EP Interface: 1
> > Sync EP Altset: 2
> > Implicit Feedback Mode: No
> > Interface 1
> > Altset 3
> > Format: S32_LE
> > Channels: 2
> > Endpoint: 0x01 (1 OUT) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 32
> > Channel map: FL FR
> > Sync Endpoint: 0x81 (1 IN)
> > Sync EP Interface: 1
> > Sync EP Altset: 3
> > Implicit Feedback Mode: No
> > Interface 1
> > Altset 4
> > Format: SPECIAL DSD_U32_BE
> > Channels: 2
> > Endpoint: 0x01 (1 OUT) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 32
> > DSD raw: DOP=0, bitrev=0
> > Channel map: FL FR
> > Sync Endpoint: 0x81 (1 IN)
> > Sync EP Interface: 1
> > Sync EP Altset: 4
> > Implicit Feedback Mode: No
> >
> > Capture:
> > Status: Stop
> > Interface 2
> > Altset 1
> > Format: S16_LE
> > Channels: 2
> > Endpoint: 0x82 (2 IN) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 16
> > Channel map: FL FR
> > Interface 2
> > Altset 2
> > Format: S24_3LE
> > Channels: 2
> > Endpoint: 0x82 (2 IN) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 24
> > Channel map: FL FR
> > Interface 2
> > Altset 3
> > Format: S32_LE
> > Channels: 2
> > Endpoint: 0x82 (2 IN) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 32
> > Channel map: FL FR
> > Interface 2
> > Altset 4
> > Format: SPECIAL DSD_U32_BE
> > Channels: 2
> > Endpoint: 0x82 (2 IN) (ASYNC)
> > Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000,
> 705600, 768000
> > Data packet interval: 125 us
> > Bits: 32
> > DSD raw: DOP=0, bitrev=0
> > Channel map: FL FR
> >
>
> cat /proc/asound/card*/stream0
> Comtrue-inc Comtrue-inc UAC2 Device EVM-GB at usb-0000:00:14.0-5, high speed : USB Audio
>
> Playback:
> Status: Stop
> Interface 1
> Altset 1
> Format: S16_LE
> Channels: 2
> Endpoint: 0x01 (1 OUT) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 16
> Channel map: FL FR
> Sync Endpoint: 0x81 (1 IN)
> Sync EP Interface: 1
> Sync EP Altset: 1
> Implicit Feedback Mode: No
> Interface 1
> Altset 2
> Format: S24_3LE
> Channels: 2
> Endpoint: 0x01 (1 OUT) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 24
> Channel map: FL FR
> Sync Endpoint: 0x81 (1 IN)
> Sync EP Interface: 1
> Sync EP Altset: 2
> Implicit Feedback Mode: No
> Interface 1
> Altset 3
> Format: S32_LE
> Channels: 2
> Endpoint: 0x01 (1 OUT) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 32
> Channel map: FL FR
> Sync Endpoint: 0x81 (1 IN)
> Sync EP Interface: 1
> Sync EP Altset: 3
> Implicit Feedback Mode: No
> Interface 1
> Altset 4
> Format: SPECIAL DSD_U32_BE
> Channels: 2
> Endpoint: 0x01 (1 OUT) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 32
> DSD raw: DOP=0, bitrev=0
> Channel map: FL FR
> Sync Endpoint: 0x81 (1 IN)
> Sync EP Interface: 1
> Sync EP Altset: 4
> Implicit Feedback Mode: No
>
> Capture:
> Status: Stop
> Interface 2
> Altset 1
> Format: S16_LE
> Channels: 2
> Endpoint: 0x82 (2 IN) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 16
> Channel map: FL FR
> Interface 2
> Altset 2
> Format: S24_3LE
> Channels: 2
> Endpoint: 0x82 (2 IN) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 24
> Channel map: FL FR
> Interface 2
> Altset 3
> Format: S32_LE
> Channels: 2
> Endpoint: 0x82 (2 IN) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 32
> Channel map: FL FR
> Interface 2
> Altset 4
> Format: SPECIAL DSD_U32_BE
> Channels: 2
> Endpoint: 0x82 (2 IN) (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000, 705600, 768000
> Data packet interval: 125 us
> Bits: 32
> DSD raw: DOP=0, bitrev=0
> Channel map: FL FR
>

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