linux-kernel - Re: [PATCH] [media] vb2: map dmabuf for planes on driver queue instead of vidioc

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Date:	Sat, 16 Jul 2016 13:15:43 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	linux-kernel@...r.kernel.org
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mauro Carvalho Chehab <mchehab@...pensource.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Pawel Osciak <pawel@...iak.com>, linux-media@...r.kernel.org,
	Hans Verkuil <hverkuil@...all.nl>,
	Shuah Khan <shuahkh@....samsung.com>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>
Subject: Re: [PATCH] [media] vb2: map dmabuf for planes on driver queue instead
 of vidioc_qbuf

On 15/07/16 17:26, Javier Martinez Canillas wrote:
> The buffer planes' dma-buf are currently mapped when buffers are queued
> from userspace but it's more appropriate to do the mapping when buffers
> are queued in the driver since that's when the actual DMA operation are
> going to happen.
> 
> Suggested-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> ---
> 
> Hello,
> 
> A side effect of this change is that if the dmabuf map fails for some
> reasons (i.e: a driver using the DMA contig memory allocator but CMA
> not being enabled), the fail will no longer happen on VIDIOC_QBUF but
> later (i.e: in VIDIOC_STREAMON).
> 
> I don't know if that's an issue though but I think is worth mentioning.
> 
> Best regards,
> Javier
> 

Just run this path on the ODROID using GStreamer and the vivid driver.
It worked nicely.

Tested-by: Luis de Bethencourt <luisbg@....samsung.com>

Thanks Javier,
Luis