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

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Date:   Mon, 14 May 2018 19:28:49 +0200
From:   Josef Šimánek <josef.simanek@...il.com>
To:     ming_qian@...lsil.com.cn
Cc:     linux-kernel@...r.kernel.org,
        Josef Šimánek <josef.simanek@...il.com>
Subject: RE: media: uvcvideo: Support realtek's UVC 1.5 device

> 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;