linux-kernel - Re: [PATCH] usb: quirks: add quirk to start video capture on ELMO L-12F document camera reliable

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Message-ID: <YCO9pNI1hZhJ+Z9y@hovoldconsulting.com>
Date:   Wed, 10 Feb 2021 12:04:04 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Stefan Ursella <stefan.ursella@...fvision.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Kars Mulder <kerneldev@...smulder.nl>,
        Jonathan Cox <jonathan@...ox.net>,
        Tomasz Meresiński <tomasz@...esinski.eu>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: quirks: add quirk to start video capture on ELMO
 L-12F document camera reliable

On Wed, Feb 10, 2021 at 11:28:20AM +0100, Stefan Ursella wrote:
> Without this quirk starting a video capture from the device often fails with
> 
> kernel: uvcvideo: Failed to set UVC probe control : -110 (exp. 34).
> Signed-off-by: Stefan Ursella <stefan.ursella@...fvision.net>
> ---
>  drivers/usb/core/quirks.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
> index f232914de5fd..f888deaf7bab 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -480,6 +480,9 @@ static const struct usb_device_id usb_quirk_list[] = {
>  	/* novation SoundControl XL */
>  	{ USB_DEVICE(0x1235, 0x0061), .driver_info = USB_QUIRK_RESET_RESUME },
>  
> +	/* ELMO L-12F document camera */
> +	{ USB_DEVICE(0x09a1, 0x0028), .driver_info = USB_QUIRK_DELAY_CTRL_MSG },
> +

Please keep the entries sorted by VID/PID (all but the recently added
last one are).

>  	{ }  /* terminating entry must be last */
>  };

Johan