linux-kernel - Re: [PATCH] dmaengine: Add support for BCM2835.

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Message-ID: <20131113163055.GV878@sirena.org.uk>
Date:	Wed, 13 Nov 2013 16:30:55 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Florian Meier <florian.meier@...lo.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-rpi-kernel <linux-rpi-kernel@...ts.infradead.org>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	alsa-devel@...a-project.org, Martin Sperl <martin@...rl.org>
Subject: Re: [PATCH] dmaengine: Add support for BCM2835.

On Wed, Nov 13, 2013 at 08:01:01PM +0530, Vinod Koul wrote:
> On Wed, Nov 13, 2013 at 02:54:41PM +0000, Mark Brown wrote:

> > Yes, though I think some of the stuff Martin was talking about will need
> > changes to the dmaengine APIs.  He was wanting to reuse DMA lists which
> > currently dmaengine needs to have built up each time.

> Can you elobrate a bit more on what you guys want to do here?

He wants to be able to submit a descriptor to the hardware more than
once to save on the costs of of constructing the descriptor.  I'm not
convinced this is a huge benefit most of the time.

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