linux-kernel - Re: media: uvcvideo: Support realtek's UVC 1.5 device

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Date:   Mon, 14 May 2018 19:38:13 +0200
From:   Josef Šimánek <josef.simanek@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: media: uvcvideo: Support realtek's UVC 1.5 device

I'm really sorry, but this message was originally meant to be sent
(and was already also sent) to linux-media. Please ignore here.

2018-05-14 19:28 GMT+02:00 Josef Šimánek <josef.simanek@...il.com>:
>
> > The length of UVC 1.5 video control is 48, and it id 34 for UVC 1.1.
> > Change it to 48 for UVC 1.5 device,
> > and the UVC 1.5 device can be recognized.
> >
> > More changes to the driver are needed for full UVC 1.5 compatibility.
> > However, at least the UVC 1.5 Realtek RTS5847/RTS5852 cameras have
> > been reported to work well.
> >
> > Signed-off-by: ming_qian <ming_qian@...lsil.com.cn>
> > Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Hello! I have sucessfully tested this patch on Kernel 4.16.1 (Fedora 28) with Dell XPS 9370
> using following device (output from lsusb):
>
> Bus 001 Device 002: ID 0bda:58f4 Realtek Semiconductor Corp.
>
> You can also find related dmesg output at https://bugs.launchpad.net/dell-sputnik/+bug/1763748/comments/35
>
> Tested-by: Josef Šimánek <josef.simanek@...il.com>
> > Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> > ---
> >  drivers/media/usb/uvc/uvc_video.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> > index aa0082f..32dfb32 100644
> > --- a/drivers/media/usb/uvc/uvc_video.c
> > +++ b/drivers/media/usb/uvc/uvc_video.c
> > @@ -171,6 +171,8 @@ static int uvc_get_video_ctrl(struct uvc_streaming *stream,
> >       int ret;
> >
> >       size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
> > +     if (stream->dev->uvc_version >= 0x0150)
> > +             size = 48;
> >       if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) &&
> >                       query == UVC_GET_DEF)
> >               return -EIO;
> > @@ -259,6 +261,8 @@ static int uvc_set_video_ctrl(struct uvc_streaming *stream,
> >       int ret;
> >
> >       size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
> > +     if (stream->dev->uvc_version >= 0x0150)
> > +             size = 48;
> >       data = kzalloc(size, GFP_KERNEL);
> >       if (data == NULL)
> >               return -ENOMEM;