From: wangdicheng <wangdicheng@xxxxxxxxxx>
commit 74dba240881820b46b9b1c62ef4de3bfff47fbd4 upstream.
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 using xhci_hcd
[ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05
[ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 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 (=4096), cval->res is probably wrong.
[ 96.102436][ 2] [ T3680] usb 5-2.2: [5] FU [Mic Capture Volume] ch = 1, val = 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 range.
(snip)
[ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd
[ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05
[ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 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-usb-audio
[ 96.114329][ 7] [ T3677] usb 5-2.2: Found UVC 1.00 device HD webcam (1bcf:2281)
[ 96.167555][ 7] [ T3677] usbcore: registered new interface driver uvcvideo
Signed-off-by: wangdicheng <wangdicheng@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20240719020906.8078-1-wangdich9700@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/mixer.c | 7 +++++++
sound/usb/quirks.c | 2 ++
2 files changed, 9 insertions(+)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1211,6 +1211,13 @@ static void volume_control_quirks(struct
cval->res = 16;
}
break;
+ case USB_ID(0x1bcf, 0x2281): /* HD Webcam */
+ if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
+ usb_audio_info(chip,
+ "set resolution quirk: cval->res = 16\n");
+ cval->res = 16;
+ }
+ break;
}
}
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2225,6 +2225,8 @@ static const struct usb_audio_quirk_flag
QUIRK_FLAG_ALIGN_TRANSFER),
DEVICE_FLG(0x534d, 0x2109, /* MacroSilicon MS2109 */
QUIRK_FLAG_ALIGN_TRANSFER),
+ DEVICE_FLG(0x1bcf, 0x2281, /* HD Webcam */
+ QUIRK_FLAG_GET_SAMPLE_RATE),
/* Vendor matches */
VENDOR_FLG(0x045e, /* MS Lifecam */
Patches currently in stable-queue which might be from wangdicheng@xxxxxxxxxx are
queue-6.10/alsa-usb-audio-fix-microphone-sound-on-hd-webcam.patch
queue-6.10/alsa-usb-audio-add-a-quirk-for-sonix-hd-usb-camera.patch
