[Bug 219683] New: Noname web used to work

[Bug 219683] New: Noname web used to work

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219683

            Bug ID: 219683
           Summary: Noname web used to work
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: blocking
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: pierre.juhen@orange.fr
        Regression: No

Created attachment 307477
  --> https://bugzilla.kernel.org/attachment.cgi?id=307477&action=edit
lsusb -D output for WebCAM

Hi,

I have a noname camera that used to work perfectly (1c3f:2002).

Since I migrated recently to kernel 6.12, it doesnt work anymore, but the
microphone works.

Log when it use to work:
Apr 10 17:05:17 pierre kernel: usb 1-1: new high-speed USB device number 2
using xhci_hcd
Apr 10 17:05:17 pierre kernel: usb 1-1: config 1 interface 0 altsetting 0
endpoint 0x83 has an invalid bInterval 32, changing to 9
Apr 10 17:05:17 pierre kernel: usb 1-1: New USB device found, idVendor=1c3f,
idProduct=2002, bcdDevice= 1.00
Apr 10 17:05:17 pierre kernel: usb 1-1: New USB device strings: Mfr=1,
Product=2, SerialNumber=0
Apr 10 17:05:17 pierre kernel: usb 1-1: Product: WEB CAM
Apr 10 17:05:17 pierre kernel: usb 1-1: Manufacturer: WCM_USB
Apr 10 17:05:22 pierre kernel: usb 1-1: Warning! Unlikely big volume range
(=5120), cval->res is probably wrong.
Apr 10 17:05:22 pierre kernel: usb 1-1: [5] FU [Mic Capture Volume] ch = 1, val
= 7680/12800/1
Apr 10 17:05:22 pierre kernel: usb 1-1: Found UVC 1.00 device WEB CAM
(1c3f:2002)
Apr 10 17:05:22 pierre kernel: usb 1-1: UVC non compliance - GET_DEF(PROBE) not
supported. Enabling workaround.

Log Now :

janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: new high-speed USB device
number 2 using xhci_hcd
janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: config 1 interface 0
altsetting 0 endpoint 0x83 has an invalid bInterval 32, changing to 9
janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: New USB device found,
idVendor=1c3f, idProduct=2002, bcdDevice= 1.00
janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: New USB device strings:
Mfr=1, Product=2, SerialNumber=0
janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: Product: WEB CAM
janv. 11 18:01:42 pierre.fonteny kernel: usb 3-1: Manufacturer: WCM_USB
janv. 11 18:01:46 pierre.fonteny kernel: usb 3-1: Found multiple Units with ID
5
janv. 11 18:01:47 pierre.fonteny kernel: usb 3-1: Warning! Unlikely big volume
range (=5120), cval->res is probably wrong.
janv. 11 18:01:47 pierre.fonteny kernel: usb 3-1: [5] FU [Mic Capture Volume]
ch = 1, val = 7680/12800/1

Difference is :

janv. 11 18:01:46 pierre.fonteny kernel: usb 3-1: Found multiple Units with ID
5

There are effectively two parts bunitid 5, one for the image, one for the sound 

But only the second is taken into account, so only the sound works.

Regards

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[Bug 219683] Noname webcam used to work, but not anymore.

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--- Comment #1 from Pierre Juhen (pierre.juhen@orange.fr) ---
/dev/video[0-1] don't appear. 

The webcam is not linked to uvcvideo (whih is modprobed, anyhow).

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--- Comment #2 from Pierre Juhen (pierre.juhen@orange.fr) ---
Analog error debated here : 

https://forum.manjaro.org/t/suggestions-for-a-recently-broken-webcam/172105

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--- Comment #3 from Pierre Juhen (pierre.juhen@orange.fr) ---
So the problem lies here in uvc_driver.

struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
{
        struct uvc_entity *entity;

        list_for_each_entry(entity, &dev->entities, list) {
                if (entity->id == id)
                        return entity;
        }

        return NULL;
}


The UVC spec says :

Each Unit and Terminal WITHIN THE VIDEO FUNCTION function is assigned a unique
identification number, the
Unit ID (UID) or Terminal ID (TID), contained in the bUnitID or bTerminalID
field of the
descriptor, but the control includes also sound function, that explains why the
issue occurs.

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--- Comment #4 from Pierre Juhen (pierre.juhen@orange.fr) ---
Test shoud be limited to BFunction Class = 14 for Video.

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--- Comment #5 from Pierre Juhen (pierre.juhen@orange.fr) ---
SHouldnt be the "list" word be replaced by "chain" in :

list_for_each_entry(entity, &dev->entities, list)

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Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|USB                         |webcam
           Assignee|drivers_usb@kernel-bugs.ker |v4l-dvb_webcam@kernel-bugs.
                   |nel.org                     |osdl.org
            Product|Drivers                     |v4l-dvb

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