linux-kernel - Re: [PATCH 07/13] sdhci: Add support for hosts with strict 32 bit addressing

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Date:	Sun, 8 Mar 2009 15:17:10 +0100
From:	Pierre Ossman <drzeus@...eus.cx>
To:	avorontsov@...mvista.com
Cc:	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Liu Dave <DaveLiu@...escale.com>, sdhci-devel@...t.drzeus.cx,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 07/13] sdhci: Add support for hosts with strict 32 bit
 addressing

On Wed, 4 Mar 2009 20:48:45 +0300
Anton Vorontsov <avorontsov@...mvista.com> wrote:

> But I see the point of confusion... Instead of teaching
> "SDHCI core" to work with 32 bits hosts, we'd better handle this
> in the eSDHC part, in the accessors.
> 
> This is relatively trivial and should not cause much overhead
> (at least when using DMA), just a small state machine with
> the xfer mode register shadowed in software (plus, notice that
> this also handles BLOCK_SIZE, as I promised in another email):
> 

Me like. Keeps my life a lot saner. :)

Just be aware that there is a remote risk of breakage as people hacking
on sdhci-core won't be aware of esdhc's, let's call it unique,
behaviour. Some testing now and then on your part would be prudent. :)

Rgds
-- 
     -- Pierre Ossman

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