linux-kernel - Re: [RFC v4 09/17] [media] vb2: add 'ordered_in

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Date:   Fri, 3 Nov 2017 08:23:06 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Gustavo Padovan <gustavo@...ovan.org>, linux-media@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Pawel Osciak <pawel@...iak.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Brian Starkey <brian.starkey@....com>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Subject: Re: [RFC v4 09/17] [media] vb2: add 'ordered_in_vb2' property to
 queues

On 10/20/2017 11:50 PM, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@...labora.com>
> 
> By setting this member on vb2_queue the driver tell vb2 core that
> it requires the buffers queued in QBUF to be queued with same order to the
> driver.

As we discussed in Prague this appears to be an unnecessary flag. In fact,
as far as I can tell it isn't set at all in this patch series.

Regards,

	Hans

> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
> ---
>  include/media/videobuf2-core.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index 6dd3f0181107..fc333e10e7d8 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -505,6 +505,9 @@ struct vb2_buf_ops {
>   *		the same order they are dequeued from the driver. The default
>   *		is not ordered unless the driver sets this flag. As of now it
>   *		is mandatory for using explicit fences.
> + * @ordered_in_vb2: set by the driver to tell vb2 te guarantee the order
> + *		of buffer queue from userspace with QBUF() until they are
> + *		queued to the driver.
>   * @fileio:	file io emulator internal data, used only if emulator is active
>   * @threadio:	thread io internal data, used only if thread is active
>   */
> @@ -558,6 +561,7 @@ struct vb2_queue {
>  	unsigned int			copy_timestamp:1;
>  	unsigned int			last_buffer_dequeued:1;
>  	unsigned int			ordered_in_driver:1;
> +	unsigned int			ordered_in_vb2:1;
>  
>  	struct vb2_fileio_data		*fileio;
>  	struct vb2_threadio_data	*threadio;
>