linux-kernel - Re: [PATCH v2] media: uvcvideo: Recover stalled ElGato devices

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Date:   Mon, 5 Dec 2022 20:57:09 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        Yunke Cao <yunkec@...omium.org>
Subject: Re: [PATCH v2] media: uvcvideo: Recover stalled ElGato devices

On (22/12/02 18:01), Ricardo Ribalda wrote:
> Elgato Cam Link 4k can be in a stalled state if the resolution of
> the external source has changed while the firmware initializes.
> Once in this state, the device is useless until it receives a
> USB reset. It has even been observed that the stalled state will
> continue even after unplugging the device.
> 
> lsusb -v
> 
> Bus 002 Device 002: ID 0fd9:0066 Elgato Systems GmbH Cam Link 4K
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               3.00
>   bDeviceClass          239 Miscellaneous Device
>   bDeviceSubClass         2
>   bDeviceProtocol         1 Interface Association
>   bMaxPacketSize0         9
>   idVendor           0x0fd9 Elgato Systems GmbH
>   idProduct          0x0066
>   bcdDevice            0.00
>   iManufacturer           1 Elgato
>   iProduct                2 Cam Link 4K
>   iSerial                 4 0005AC52FE000
>   bNumConfigurations      1
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>

>  
> +static const struct usb_device_id elgato_cam_link_4k = {
> +						USB_DEVICE(0x0fd9, 0x0066)};
> +

A nit, I'd format this slightly different:

+static const struct usb_device_id elgato_cam_link_4k = {
+	USB_DEVICE(0x0fd9, 0x0066)
+};