Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 17 Nov 2017 10:23:05 -0200
From:   Gustavo Padovan <gustavo@padovan.org>
To:     Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc:     linux-media@vger.kernel.org, Hans Verkuil <hverkuil@xs4all.nl>,
        Shuah Khan <shuahkh@osg.samsung.com>,
        Pawel Osciak <pawel@osciak.com>,
        Alexandre Courbot <acourbot@chromium.org>,
        Sakari Ailus <sakari.ailus@iki.fi>,
        Brian Starkey <brian.starkey@arm.com>,
        Thierry Escande <thierry.escande@collabora.com>,
        linux-kernel@vger.kernel.org,
        Gustavo Padovan <gustavo.padovan@collabora.com>
Subject: Re: [RFC v5 01/11] [media] v4l: add V4L2_CAP_ORDERED to the uapi
Message-ID: <20171117122305.GE19033@jade>
References: <20171115171057.17340-1-gustavo@padovan.org>
 <20171115171057.17340-2-gustavo@padovan.org>
 <20171117095731.2172c3c2@vento.lan>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20171117095731.2172c3c2@vento.lan>
User-Agent: Mutt/1.9.1 (2017-09-22)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

2017-11-17 Mauro Carvalho Chehab <mchehab@osg.samsung.com>:

> Em Wed, 15 Nov 2017 15:10:47 -0200
> Gustavo Padovan <gustavo@padovan.org> escreveu:
> 
> > From: Gustavo Padovan <gustavo.padovan@collabora.com>
> > 
> > When using explicit synchronization userspace needs to know if
> > the queue can deliver everything back in the same order, so we added
> > a new capability that drivers can use to report that they are capable
> > of keeping ordering.
> > 
> > In videobuf2 core when using fences we also make sure to keep the ordering
> > of buffers, so if the driver guarantees it too the whole pipeline inside
> > V4L2 will be ordered and the V4L2_CAP_ORDERED should be used.
> > 
> > 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..ed3daa814da9 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_ORDERED``
> > +      - 0x20000000
> > +      - The device queue is ordered.
> >      * - ``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 185d6a0acc06..cd6fc1387f47 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -459,6 +459,7 @@ struct v4l2_capability {
> >  #define V4L2_CAP_STREAMING              0x04000000  /* streaming I/O ioctls */
> >  
> >  #define V4L2_CAP_TOUCH                  0x10000000  /* Is a touch device */
> > +#define V4L2_CAP_ORDERED                0x20000000  /* Is the device queue ordered */
> 
> I guess we discussed that at the Linux Media summit.
> The problem of making it a global flag is that drivers may support
> ordered formats only for some of the formats. E. g., a driver that
> delivers both MPEG and RGB output formats may deliver ordered
> buffers for RGB, and unordered ones for MPEG.
> 
> So, instead of doing a global format at v4l2_capability, it is probably
> better to use the flags field at struct v4l2_fmtdesc.
> 
> That would allow userspace to know in advance what formats support
> it, by calling VIDIOC_ENUM_FMT.

Thanks for clarifying, Mauro. I'll work on making it part of
v4l2_fmtdesc.

Gustavo

From 1584163032071302506@xxx Wed Nov 15 19:53:16 +0000 2017
X-GM-THRID: 1584163032071302506
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread