linux-kernel - Re: [PATCH] media: v4l2-dev/ioctl: Fix document for VIDIOC

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Date:   Mon, 27 Jul 2020 18:18:41 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Helen Koike <helen@...keco.de>
Cc:     Jian-Jia Su <jjsu@...omium.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-dev/ioctl: Fix document for VIDIOC_QUERYCAP

On Tue, Jul 21, 2020 at 4:45 AM Helen Koike <helen@...keco.de> wrote:
>
> Hi,
>
> On 7/20/20 6:29 AM, Jian-Jia Su wrote:
> > V4L2_CAP_VIDEO_M2M is documented as 0x00004000
> > V4L2_CAP_VIDEO_M2M_MPLANE is documented as 0x00008000
> > This is different from the definition in include/uapi/linux/videodev2.h
> >
>
> Nice catch, they are swapped in the docs indeed.
>
> From videodev2.h:
>
> /* Is a video mem-to-mem device that supports multiplanar formats */
> #define V4L2_CAP_VIDEO_M2M_MPLANE       0x00004000
> /* Is a video mem-to-mem device */
> #define V4L2_CAP_VIDEO_M2M              0x00008000
>
> > Signed-off-by: Jian-Jia Su <jjsu@...omium.org>
>
> Reviewed-by: Helen Koike <helen.koike@...labora.com>

FWIW,

Reviewed-by: Alexandre Courbot <acourbot@...omium.org>

>
> Regards,
> Helen
>
> > ---
> >  Documentation/userspace-api/media/v4l/vidioc-querycap.rst | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
> > index 666ac4d420519..90347367ef06a 100644
> > --- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
> > +++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
> > @@ -168,11 +168,11 @@ specification the ioctl returns an ``EINVAL`` error code.
> >        - The device supports the :ref:`multi-planar API <planar-apis>`
> >       through the :ref:`Video Output <output>` interface.
> >      * - ``V4L2_CAP_VIDEO_M2M``
> > -      - 0x00004000
> > +      - 0x00008000
> >        - The device supports the single-planar API through the Video
> >       Memory-To-Memory interface.
> >      * - ``V4L2_CAP_VIDEO_M2M_MPLANE``
> > -      - 0x00008000
> > +      - 0x00004000
> >        - The device supports the :ref:`multi-planar API <planar-apis>`
> >       through the Video Memory-To-Memory interface.
> >      * - ``V4L2_CAP_VIDEO_OVERLAY``
> >