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    SubjectRe: [PATCH v8 11/13] [media] v4l: introduce the fences capability
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    On 03/09/2018 09:49 AM, Gustavo Padovan wrote:
    > From: Gustavo Padovan <gustavo.padovan@collabora.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@collabora.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

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