linux-kernel - Re: [PATCH 6/6] atmel

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Message-ID: <20080123164150.4b162826@lxorguk.ukuu.org.uk>
Date:	Wed, 23 Jan 2008 16:41:50 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
Cc:	Marc Pignat <marc.pignat@...s.ch>,
	Andrew Victor <linux@...im.org.za>, kernel@...32linux.org,
	linux-kernel@...r.kernel.org, Remy Bohmer <linux@...mer.net>,
	Chip Coldwell <coldwell@...hat.com>
Subject: Re: [PATCH 6/6] atmel_serial: Add DMA support

On Wed, 23 Jan 2008 16:14:25 +0100
Haavard Skinnemoen <hskinnemoen@...el.com> wrote:

> On Wed, 23 Jan 2008 15:04:36 +0000
> Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> > > No, I think GFP_DMA is for legacy ISA DMA and other DMA controllers
> > > with addressing limitations. The PDC is capable of accessing the full
> > > 32-bit physical address space on both AT91 and AVR32, so no special DMA
> > > flags are needed.
> > 
> > For kernel coherent DMA buffers use the dma_ API to allocate the memory.
> 
> Yes, but since we're managing DMA coherency using the streaming DMA
> API, we don't really need coherent buffers, right?

Right.

Alan
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