linux-kernel - Re: [RFC][PATCH 02/15] videobuf2: handle V4L2 buffer cache flags

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Message-ID: <20200122025351.GF149602@google.com>
Date:   Wed, 22 Jan 2020 11:53:51 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Hans Verkuil <hverkuil@...all.nl>
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,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [RFC][PATCH 02/15] videobuf2: handle V4L2 buffer cache flags

On (20/01/22 10:39), Sergey Senozhatsky wrote:
> [..]
> > >  }
> > >  
> > > +static void set_buffer_cache_hints(struct vb2_queue *q,
> > > +				   struct vb2_buffer *vb,
> > > +				   struct v4l2_buffer *b)
> > > +{
> > > +	vb->need_cache_sync_on_prepare = 1;
> > > +
> > > +	if (q->dma_dir != DMA_TO_DEVICE)
> > 
> > What should be done when dma_dir == DMA_BIDIRECTIONAL?
> 

[..]

> We probably cannot enforce any other behavior here. Am I missing
> something?

Never mind. I got your point.

	-ss