linux-kernel - Re: [PATCH v8 11/13] [media] v4l: introduce the fences capability

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Date:   Tue, 13 Mar 2018 20:12:19 -0700
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Gustavo Padovan <gustavo@...ovan.org>, linux-media@...r.kernel.org
Cc:     kernel@...labora.com,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Pawel Osciak <pawel@...iak.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Brian Starkey <brian.starkey@....com>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Subject: Re: [PATCH v8 11/13] [media] v4l: introduce the fences capability

On 03/09/2018 09:49 AM, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@...labora.com>
> 
> Drivers capable of using fences (vb2 drivers) should report the
> V4L2_CAP_FENCES to userspace, so add this flag to the uapi.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
> ---
>  Documentation/media/uapi/v4l/vidioc-querycap.rst | 3 +++
>  include/uapi/linux/videodev2.h                   | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
> index 66fb1b3d6e6e..414016065309 100644
> --- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
> +++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
> @@ -254,6 +254,9 @@ specification the ioctl returns an ``EINVAL`` error code.
>      * - ``V4L2_CAP_TOUCH``
>        - 0x10000000
>        - This is a touch device.
> +    * - ``V4L2_CAP_FENCES``
> +      - 0x20000000
> +      - The device support explicit synchronization.

support -> supports

>      * - ``V4L2_CAP_DEVICE_CAPS``
>        - 0x80000000
>        - The driver fills the ``device_caps`` field. This capability can
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 2d424aebdd1e..db58204e346e 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -460,6 +460,7 @@ struct v4l2_capability {
>  #define V4L2_CAP_STREAMING              0x04000000  /* streaming I/O ioctls */
>  
>  #define V4L2_CAP_TOUCH                  0x10000000  /* Is a touch device */
> +#define V4L2_CAP_FENCES                 0x20000000  /* Supports explicit synchronization */
>  
>  #define V4L2_CAP_DEVICE_CAPS            0x80000000  /* sets device capabilities field */
>  
> 

Regards,

	Hans