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SubjectRe: [PATCH] media: uvcvideo: Support realtek's UVC 1.5 device
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Date

> On May 23, 2018, at 4:32 AM, Laurent Pinchart
> <laurent.pinchart@ideasonboard.com> wrote:
>
> Hello,
>
> Thank you for the patch.
>
> On Wednesday, 9 May 2018 05:13:08 EEST ming_qian@realsil.com.cn wrote:
>> From: ming_qian <ming_qian@realsil.com.cn>
>>
>> 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.
>
> This patch is however not specific to Realtek devices, so I think we should
> make the subject line more generic. It's fine mentioning in the commit
> message
> itself that the Realtek RTS5847/RTS5852 cameras have been successfully
> tested.
>
>> Signed-off-by: ming_qian <ming_qian@realsil.com.cn>
>> ---
>> 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;
>
> Instead of duplicating the computation in both functions, I think we should
> move the code to a helper function.
>
> Furthermore there are equality checks further down both functions that
> compare
> the size to 34, they should be updated to also support UVC 1.5.
>
> I propose the following updated patch. If you're fine with it there's no
> need
> to resubmit, I'll queue it for v4.19.
>
> I have dropped the Reviewed-by and Tested-by tags as the patch has changed.
>
> commit a9c002732695eab2096580a0d1a1687bc2f95928
> Author: ming_qian <ming_qian@realsil.com.cn>
> Date: Wed May 9 10:13:08 2018 +0800
>
> media: uvcvideo: Support UVC 1.5 video probe & commit controls
>
> The length of UVC 1.5 video control is 48, and it is 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.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: ming_qian <ming_qian@realsil.com.cn>
> [Factor out code to helper function, update size checks]
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

I tested this new patch and it works well.

Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

>
> diff --git a/drivers/media/usb/uvc/uvc_video.c
> b/drivers/media/usb/uvc/uvc_video.c
> index eb9e04a59427..285b0e813b9d 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -207,14 +207,27 @@ static void uvc_fixup_video_ctrl(struct
> uvc_streaming *stream,
> }
> }
>
> +static size_t uvc_video_ctrl_size(struct uvc_streaming *stream)
> +{
> + /*
> + * Return the size of the video probe and commit controls, which depends
> + * on the protocol version.
> + */
> + if (stream->dev->uvc_version < 0x0110)
> + return 26;
> + else if (stream->dev->uvc_version < 0x0150)
> + return 34;
> + else
> + return 48;
> +}
> +
> static int uvc_get_video_ctrl(struct uvc_streaming *stream,
> struct uvc_streaming_control *ctrl, int probe, u8 query)
> {
> + u16 size = uvc_video_ctrl_size(stream);
> u8 *data;
> - u16 size;
> int ret;
>
> - size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
> if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) &&
> query == UVC_GET_DEF)
> return -EIO;
> @@ -271,7 +284,7 @@ static int uvc_get_video_ctrl(struct uvc_streaming
> *stream,
> ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]);
> ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]);
>
> - if (size == 34) {
> + if (size >= 34) {
> ctrl->dwClockFrequency = get_unaligned_le32(&data[26]);
> ctrl->bmFramingInfo = data[30];
> ctrl->bPreferedVersion = data[31];
> @@ -300,11 +313,10 @@ static int uvc_get_video_ctrl(struct uvc_streaming
> *stream,
> static int uvc_set_video_ctrl(struct uvc_streaming *stream,
> struct uvc_streaming_control *ctrl, int probe)
> {
> + u16 size = uvc_video_ctrl_size(stream);
> u8 *data;
> - u16 size;
> int ret;
>
> - size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
> data = kzalloc(size, GFP_KERNEL);
> if (data == NULL)
> return -ENOMEM;
> @@ -321,7 +333,7 @@ static int uvc_set_video_ctrl(struct uvc_streaming
> *stream,
> put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]);
> put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]);
>
> - if (size == 34) {
> + if (size >= 34) {
> put_unaligned_le32(ctrl->dwClockFrequency, &data[26]);
> data[30] = ctrl->bmFramingInfo;
> data[31] = ctrl->bPreferedVersion;
>
> --
> Regards,
>
> Laurent Pinchart

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