From: Takashi Iwai <tiwai@suse.de>
To: Achilles Zhang <bnqzzdf@gmail.com>
Cc: Takashi Iwai <tiwai@suse.com>, Jaroslav Kysela <perex@perex.cz>,
linux-sound@vger.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Add native DSD quirk for HiBy FC4
Date: Mon, 28 Sep 2026 13:14:05 +0200 [thread overview]
Message-ID: <874if97hmq.wl-tiwai@suse.de> (raw)
In-Reply-To: <20260921024344.391912-1-bnqzzdf@gmail.com>
On Mon, 21 Sep 2026 04:43:43 +0200,
Achilles Zhang wrote:
>
> 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>
Applied now. Thanks.
Takashi
prev parent reply other threads:[~2026-09-28 11:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-21 2:43 [PATCH] ALSA: usb-audio: Add native DSD quirk for HiBy FC4 Achilles Zhang
2026-09-28 11:14 ` Takashi Iwai [this message]
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