linux-kernel - Re: [PATCH] dmaengine: add dmanegine slave map api's

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Message-ID: <20120917083654.GO12245@n2100.arm.linux.org.uk>
Date:	Mon, 17 Sep 2012 09:36:54 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Dan Williams <djbw@...com>,
	Arnd Bergmann <arnd@...db.de>, linus.walleij@...aro.org,
	Jon Hunter <jon-hunter@...com>,
	Stephen Warren <swarren@...dia.com>,
	Benoit Cousson <b-cousson@...com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kukjin Kim <kgene.kim@...sung.com>,
	viresh kumar <viresh.kumar@...aro.org>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH] dmaengine: add dmanegine slave map api's

On Mon, Sep 17, 2012 at 09:10:23AM +0530, Vinod Koul wrote:
> On Fri, 2012-09-14 at 12:18 +0100, Russell King - ARM Linux wrote:
> > I'm not saying take the slave_id out of the map.  I'm saying, let the
> > DMA engine driver itself figure out what dma_chan to return. 
> But wont that assume the dma controller knows which channel to allocate.
> And how would it know this information? This can be problematic for hard
> wired muxes, but can be easily done for controller which have
> programmable mux.

Well, as I have already said, at the moment you're returning the _first_
_free_ _channel_ on a DMA device, which almost certainly will always be
the wrong one.
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