linux-kernel - Re: [PATCH 0/4] Fix the left DMA_NONE from dma_transfer

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Message-ID: <1324530802.1641.10123.camel@vkoul-udesk3>
Date:	Thu, 22 Dec 2011 10:43:22 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	Artem Bityutskiy <artem.bityutskiy@...el.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shawn Guo <shawn.guo@...aro.org>,
	Huang Shijie <b32955@...escale.com>,
	linux-mtd@...ts.infradead.org, Chris Ball <cjb@...top.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/4] Fix the left DMA_NONE from dma_transfer_direction
 migration

On Wed, 2011-12-21 at 12:58 +0800, Shawn Guo wrote:
> On Wed, Dec 21, 2011 at 10:10:51AM +0530, Vinod Koul wrote:
> > On Wed, 2011-12-21 at 12:45 +0800, Shawn Guo wrote:
> > > > 
> > > The term PIO here may not the one on your mind.  I call it 'mxs-dma
> > > pio'.  In this mode, mxs-dma hardware can write values into mmc
> > > controller register without cpu involved.
> > what do you mean by values here?
> > 
> The register values that we want to write to mmc controller registers
> in this case.
Okay I am going to put this in my queue as this is fixing a regression
But, I still don't agree that DMA_NONE as a direction is the correct way
to tell dma driver about this. Perhaps we need to find a better
mechanism.


-- 
~Vinod

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