linux-kernel - Re: [PATCH v7 01/10] ARM: davinci: move private EDMA API to arm/common

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Message-Id: <201302052226.30754.arnd@arndb.de>
Date:	Tue, 5 Feb 2013 22:26:30 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Felipe Balbi <balbi@...com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Sergei Shtylyov <sshtylyov@...sta.com>,
	Matt Porter <mporter@...com>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Chris Ball <cjb@...top.org>,
	"Cousson, Benoit" <b-cousson@...com>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Dan Williams <djbw@...com>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 01/10] ARM: davinci: move private EDMA API to arm/common

On Tuesday 05 February 2013, Tony Lindgren wrote:
> * Felipe Balbi <balbi@...com> [130204 07:46]:
> > 
> > Current DMA abstraction is quite poor, for example there's no way to
> > compile support for multiple DMA engines. Code also makes certain, IMO
> > unnecessary, assumptions about the underlying DMA engine (abstraction is
> > poor, as said above but it we could follow MUSB's programming guide when
> > it comes to programming DMA transfers).
> > 
> > Considering all of the above, it's far better to use DMA engine and get
> > rid of all the mess.
> 
> How about just disable MUSB DMA support if ARCH_MULTIPLATFORM for now?
> That way MUSB can be fixed up first to support ARCH_MULTIPLATFORM
> using PIO while sorting out the DMA related issues.

Sounds ok to me. Someone still needs to do the work to make the non-DMA
variants of MUSB coexist in one kernel, but as we discussed erlier, that
should be much simpler.

	Arnd
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