From nobody Thu Dec 18 08:30:53 2025 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 947672E631 for ; Wed, 17 Jul 2024 07:53:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721202814; cv=none; b=fNCJHDF4KoxbPkgYF6T2MoUGqhq7xdnxI7FziXhHuXnlF/mtUt9SRACbt74/o2te3dVfXTFsWmYagEZiumMFtq8faP5sx1UYnur7QZpkb6iOZmh7iiX+xLTHyeiU0wIFRhLS/2a6gMmA1e4fyXJJcPDbDULtY2vkuCLoEIztILI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721202814; c=relaxed/simple; bh=qpXx8DefeHSsvgTZuVKLsCBg8nkwFmy59pd5HFFAO0c=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=b9OKC2vso0EQIuXoYQyPsZVjoNTrwudd02culoq9QIoEFHWpw+1fSnXumkZS791457IETDZxxhkBUnFvFtruPhMq4R+3Y8lA0yHSu3EmmqAJWBAb5f7Desh3upkq57Zyw1U43fh5IMX0n8Hxq2Kk07+Zfbo7MkmMNRz7TcFeCOY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=iNoXkxOa; arc=none smtp.client-ip=220.197.31.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="iNoXkxOa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=4GVmu RflNQuk38b4FkTRNGzpZ2+WoDkRlDKdrK3RSvo=; b=iNoXkxOa5buN8GyIa6+5d SukUMOUJGPIl63gnuuMAJISa4RXd6UZsaT7OqKBeX5yrtN5AaxgvHoQFIvh147zT bZFGBuyXWTAWNxbFp45IEq1DATIr0xZH3VJGjpGiGfdrayblN7+XVT7PUlO8l5Ho KdU0f4cSRGq/kZ0kmlNzDM= Received: from localhost.localdomain (unknown [111.48.69.245]) by gzga-smtp-mta-g1-3 (Coremail) with SMTP id _____wD331sXeJdm2Pm2DA--.62258S2; Wed, 17 Jul 2024 15:51:53 +0800 (CST) From: wangdicheng To: lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, linux-arm-kernel@lists.infradead.org, wangdicheng Subject: [PATCH] ALSA: usb-audio: Fix microphone sound on HD webcam. Date: Wed, 17 Jul 2024 15:51:49 +0800 Message-Id: <20240717075149.6915-1-wangdich9700@163.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wD331sXeJdm2Pm2DA--.62258S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxXw43JFy5tFyrCF45Xw13urg_yoWrCF17pr 1Iva97JryDJr17Xr48GayUu34rXw4Iyws8Ca4qkwna9ryft34rta42y39rAayakrWrC342 qryqy390g3y5Gw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07j5Ef5UUUUU= X-CM-SenderInfo: pzdqwv5lfkmliqq6il2tof0z/1tbiRxQfT2V4KU6QQgABsq Content-Type: text/plain; charset="utf-8" From: wangdicheng I own an external usb Webcam, HD webcam, which had low mic volume and inconsistent sound quality. Video works as expected. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 u= sing xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=3D1bc= f, idProduct=3D2281, bcdDevice=3D 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=3D1, Pro= duct=3D2, SerialNumber=3D3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.092610][ 2] [ T3680] usb 5-2.2: Warning! Unlikely big volume range (= =3D4096), cval->res is probably wrong. [ 96.102436][ 2] [ T3680] usb 5-2.2: [5] FU [Mic Capture Volume] ch =3D 1= , val =3D 0/4096/1 Set up quirk cval->res to 16 for 256 levels, Set GET_SAMPLE_RATE quirk flag to stop trying to get the sample rate. Confirmed that happened anyway later due to the backoff mechanism, After 3 failures. All audio stream on device interfaces share the same values, apart from wMaxPacketSize and tSamFreq : bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 0 iInterface 0 AudioStreaming Interface Descriptor: bLength 7 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bDelay 1 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 1 bSubframeSize 2 bBitResolution 16 bSamFreqType 1 Discrete tSamFreq[ 0] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x86 EP 6 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0064 1x 100 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 0 Undefined wLockDelay 0x0000 (snip) Testing patch provides consistent good sound recording quality and volume r= ange. (snip) [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 u= sing xhci_hcd [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=3D1bc= f, idProduct=3D2281, bcdDevice=3D 0.05 [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=3D1, Pro= duct=3D2, SerialNumber=3D3 [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 [ 96.110630][ 3] [ T3680] usbcore: registered new interface driver snd-us= b-audio [ 96.114329][ 7] [ T3677] usb 5-2.2: Found UVC 1.00 device HD webcam (1bc= f:2281) [ 96.167555][ 7] [ T3677] usbcore: registered new interface driver uvcvid= eo Signed-off-by: wangdicheng --- sound/usb/mixer.c | 7 +++++++ sound/usb/quirks.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 409fc1164694..561c974a4f14 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1211,6 +1211,13 @@ static void volume_control_quirks(struct usb_mixer_e= lem_info *cval, cval->res =3D 16; } break; + case USB_ID(0x1bcf, 0x2281): /* FHD Webcam */ + if (!strcmp(kctl->id.name, "Mic Capture Volume")) { + usb_audio_info(chip, + "set resolution quirk: cval->res =3D 16\n"); + cval->res =3D 16; + } + break; } } =20 diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 4e64842245e1..16070cd7440e 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2179,6 +2179,8 @@ static const struct usb_audio_quirk_flags_table quirk= _flags_table[] =3D { QUIRK_FLAG_FIXED_RATE), DEVICE_FLG(0x1bcf, 0x2283, /* NexiGo N930AF FHD Webcam */ QUIRK_FLAG_GET_SAMPLE_RATE), + DEVICE_FLG(0x1bcf, 0x2281, /* FHD Webcam */ + QUIRK_FLAG_GET_SAMPLE_RATE), =20 /* Vendor matches */ VENDOR_FLG(0x045e, /* MS Lifecam */ --=20 2.25.1