linux-kernel - Re: [PATCH] fsldma: use PCI Read Multiple command

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Message-ID: <20090427204752.GA22406@ld0162-tx32.am.freescale.net>
Date:	Mon, 27 Apr 2009 15:47:52 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Timur Tabi <timur@...escale.com>
Cc:	David Hawkins <dwh@...o.caltech.edu>, linuxppc-dev@...abs.org,
	Dan Williams <dan.j.williams@...el.com>,
	Liu Dave-R63238 <DaveLiu@...escale.com>,
	linux-kernel@...r.kernel.org, Ira Snyder <iws@...o.caltech.edu>
Subject: Re: [PATCH] fsldma: use PCI Read Multiple command

On Mon, Apr 27, 2009 at 03:04:49PM -0500, Timur Tabi wrote:
> David Hawkins wrote:
> 
> > Can you give me an example of non-PCI memory that would be
> > non-prefetchable that you'd like us to try? We can see if our
> > host CPUs have an area like that ... we just need to know
> > what device to look for first :)
> 
> Hmmmm.... I was going to say any SOC device in the IMMR, but I don't see
> anything there that would constitute a memory buffer.
> 
> I test this change on an 8610 and DMA to a register I/O, where this bit
> isn't even defined, and it made no difference.  So I guess this change
> is okay.

I thought the driver only used the bit if the device tree indicated it
was an 83xx-era DMA controller?

That said, the bits are documented as specifically for PCI, so it would
be surprising if it had any effect elsewhere.

-Scott
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