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[3.39.185.208]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-877aa5f8098sm2463684b3a.54.2026.09.20.19.44.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Sep 2026 19:44:11 -0700 (PDT) From: Achilles Zhang To: Takashi Iwai , Jaroslav Kysela Cc: linux-sound@vger.kernel.org, Achilles Zhang Subject: [PATCH] ALSA: usb-audio: Add native DSD quirk for HiBy FC4 Date: Mon, 21 Sep 2026 10:43:43 +0800 Message-ID: <20260921024344.391912-1-bnqzzdf@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- sound/usb/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index c587090..924d930 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2542,6 +2542,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_IGNORE_CTL_ERROR), DEVICE_FLG(0x3255, 0x0000, /* Luxman D-10X */ QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY), + DEVICE_FLG(0x32bb, 0x0004, /* HiBy FC4 */ + QUIRK_FLAG_DSD_RAW), DEVICE_FLG(0x3302, 0x17c2, /* TTGK Technology USB-C Audio */ QUIRK_FLAG_FORCE_IFACE_RESET | QUIRK_FLAG_IFACE_DELAY), DEVICE_FLG(0x339b, 0x3a07, /* Synaptics HONOR USB-C HEADSET */ -- 2.53.0