linux-kernel - Re: [PATCH 1/3] dmaengine: add dma_get_slave_sg

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Date:	Mon, 29 Jul 2013 12:14:15 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Joel Fernandes <joelf@...com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Brown <broonie@...aro.org>,
	Benoit Cousson <benoit.cousson@...aro.org>,
	Balaji TK <balajitk@...com>,
	Gururaja Hebbar <gururaja.hebbar@...com>,
	Chris Ball <cjb@...top.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Mark Jackson <mpfj-list@...flow.co.uk>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/3] dmaengine: add dma_get_slave_sg_limits()

On Thu, Jul 18, 2013 at 01:57:33PM -0500, Joel Fernandes wrote:
> On 07/18/2013 12:08 PM, Russell King - ARM Linux wrote:
> > As for the maximum number of scatterlist entries, really that's a bug in
> > the DMA engine implementations if they can't accept arbitary lengths.
> > I've created DMA engine drivers for implementations where you have to
> > program each segment individually, ones which can have the current and
> > next segments, as well as those which can walk a list.  Provided you get
> > informed of a transfer being completed, there really is no reason for a
> > DMA engine driver to limit the number of scatterlist entries that it
> > will accept.
> 
> Sure, that makes sense. Can you point to such a typical example
> implementation to get some ideas?
MXS MMC driver uses this: drivers/mmc/host/mxs-mmc.c
And dma engine driver for this is mxs-dma.c

~Vinod
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