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Date:   Sat, 7 Mar 2020 18:38:00 +0900
From:   Sergey Senozhatsky <senozhatsky@chromium.org>
To:     Hans Verkuil <hverkuil@xs4all.nl>
Cc:     Hans Verkuil <hans.verkuil@cisco.com>,
        Tomasz Figa <tfiga@chromium.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Sakari Ailus <sakari.ailus@iki.fi>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Pawel Osciak <posciak@chromium.org>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCHv4 05/11] videobuf2: handle
 V4L2_FLAG_MEMORY_NON_CONSISTENT flag
Message-ID: <20200307093800.GA191261@google.com>
References: <20200302041213.27662-1-senozhatsky@chromium.org>
 <20200302041213.27662-6-senozhatsky@chromium.org>
 <70144162-3bbe-4ea5-a3f7-e52d4585db53@xs4all.nl>
 <20200307075127.GD176460@google.com>
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On (20/03/07 16:51), Sergey Senozhatsky wrote:
> On (20/03/06 16:30), Hans Verkuil wrote:
> [..]
> > >  
> > >  /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
> > > @@ -2446,7 +2449,8 @@ struct v4l2_create_buffers {
> > >  	__u32			memory;
> > >  	struct v4l2_format	format;
> > >  	__u32			capabilities;
> > > -	__u32			reserved[7];
> > > +	__u32			flags;
> > 
> > The new flags argument needs to be documented in the command for struct v4l2_create_buffers.
> > 

Hans, what does "command for struct v4l2_create_buffers" mean?

BTW, I added v4l2_create_buffers::flags comment:

---

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 12b1bd220347..c6c1cccbb5c1 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -2441,6 +2441,8 @@ struct v4l2_dbg_chip_info {
  * @memory:	enum v4l2_memory; buffer memory type
  * @format:	frame format, for which buffers are requested
  * @capabilities: capabilities of this buffer type.
+ * @flags:	additional buffer management attributes (ignored if queue
+ *		does not have V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS capability).
  * @reserved:	future extensions
  */
 struct v4l2_create_buffers {