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

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Message-ID: <875xf8udel.wl-tiwai@suse.de>
Date: Thu, 31 Jul 2025 07:39:46 +0200
From: Takashi Iwai <tiwai@...e.de>
To: <noble.yang@...true-inc.com>
Cc: <tiwai@...e.com>,
	<perex@...ex.cz>,
	<hulianqin@...o.com>,
	<lina+kernel@...hilina.net>,
	<cyan.vtb@...il.com>,
	<dan.carpenter@...aro.org>,
	<bsevens@...gle.com>,
	<linux-sound@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
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@...true-inc.com> 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
>