linux-kernel - RE: [PATCH v2] dmaengine: add CSR SiRFprimaII DMAC driver

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Date:	Mon, 19 Sep 2011 16:44:38 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Barry Song <Barry.Song@....com>
Cc:	"21cnbao@...il.com" <21cnbao@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	DL-SHA-WorkGroupLinux <Workgroup.Linux@....com>,
	Rongjun Ying <Rongjun.Ying@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v2] dmaengine: add CSR SiRFprimaII DMAC driver

On Mon, 2011-09-19 at 09:56 +0000, Barry Song wrote:
> > > > Not sure why you support this, there seem to be no DMA_SLAVE
> support in
> > > > this version ate least
> > >
> > > Not. I support dma_slave. But I have no prep_slave_sg function
> since I can
> > use the gen xfer to replace it.
> > Yes thats okay...
> > 
> > Then I have questions on genxfer function...
> > where are you copying either src or dstn_start address, you seem to
> > completely ignore them?
> 
> Since I only support memory->device or device ->memory, and channel
> number is fixed to every device. Then I actually don't care device
> address at all. Either src or dst is fixed to the device's address.
peripheral address can be fixed, not the memory, where do you copy the
memory address?
> 
> > 
> > Do you support only slave transfers or M2M as well for this driver?
> > If only slave you might want to check if dma_config_slave is set for
> > this channel or not.
> 
> I support only slave transfer. Actually I have dma_config_slave. do
> you mean I need to check whether slave config cmd is really called
> before executing dma?
Yes


-- 
~Vinod

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