linux-kernel - Re: [PATCH 2/2] dmaengine: add TODO items for future work on dma drivers

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Message-ID: <20110526133858.GI24876@n2100.arm.linux.org.uk>
Date:	Thu, 26 May 2011 14:38:58 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	Per Forlin <per.forlin@...aro.org>
Subject: Re: [PATCH 2/2] dmaengine: add TODO items for future work on dma
	drivers

On Thu, May 26, 2011 at 05:55:30PM +0530, Koul, Vinod wrote:
> > I'd suggest adding some more to this:
> > 
> > 4. Remove dma_slave_config's dma direction.
> > 
> > It's pointless that dma_slave_config carries the DMA direction (to/from
> > device) and the prepare function does too.  It leads to DMA engine drivers
> > having to verify that the two match, and DMA engine users having to issue
> > two calls every time they change direction.
> > 
> > Instead, lets specify that dma_slave_config carries the _device_ side
> > parameters, which are selected according to the direction given to the
> > prepare function.  The memory-side parameters should be selected by the
> > DMA engine driver according to its knowledge of the system.
> > 
> > This is sensible as M2M transfers don't allow configuration and therefore
> > already have to select these parameters internally.
> Sure, I am adding this as well and applying both patches

Thanks.  In which case I'll mention that I already have patches to make
the PL08x driver do this.
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