linux-kernel - Re: [PATCHv4 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON

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Message-ID: <d5ee2f4c-0e98-3b05-6109-4b3a4779f5b2@xs4all.nl>
Date:   Sat, 7 Mar 2020 11:05:26 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <posciak@...omium.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT
 flag

On 07/03/2020 10:38, Sergey Senozhatsky wrote:
> 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?

Oops: command -> comment

> 
> BTW, I added v4l2_create_buffers::flags comment:

Good, that's what I meant :-)

Regards,

	Hans

> 
> ---
> 
> 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 {
>