linux-kernel - Re: [RFC v2 8/8] drm: tegra: Add gr2d device

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Date:	Fri, 30 Nov 2012 09:44:36 +0200
From:	Terje Bergström <tbergstrom@...dia.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
CC:	Lucas Stach <dev@...xeye.de>, Dave Airlie <airlied@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: Re: [RFC v2 8/8] drm: tegra: Add gr2d device

On 29.11.2012 14:14, Thierry Reding wrote:
> On Thu, Nov 29, 2012 at 10:09:13AM +0100, Lucas Stach wrote:
>> This way you would also be able to construct different handles (like GEM
>> obj or V4L2 buffers) from the same backing nvhost object. Note that I'm
>> not sure how useful this would be, but it seems like a reasonable design
>> to me being able to do so.
> 
> Wouldn't that be useful for sharing buffers between DRM and V4L2 using
> dma-buf? I'm not very familiar with how exactly importing and exporting
> work with dma-buf, so maybe I need to read up some more.

I would still preserve the dma-buf support, for exactly this purpose.

Terje

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