linux-kernel - Re: [PATCH 02/11] sdhci: Add support for bus-specific IO memory accessors

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Date:	Sun, 8 Mar 2009 15:08:20 +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 02/11] sdhci: Add support for bus-specific IO memory
 accessors

On Wed, 4 Mar 2009 20:46:58 +0300
Anton Vorontsov <avorontsov@...mvista.com> wrote:

> On Sat, Feb 21, 2009 at 04:57:57PM +0100, Pierre Ossman wrote:
> > 
> > We can most likely do some micro-optimisation do make the compare part
> > cheaper, but the point was to avoid a function call for all the
> > properly implemented controllers out there. We could have a flag so
> > that it only has to check host->flags, which will most likely be in the
> > cache anyway.
> > 
> > Overhead for eSDHC is not a concern in my book, what is interesting is
> > how much this change slows things down for other controllers.
> 
> OK, I see. Will the patch down below make you a little bit more happy
> wrt normal controllers? Two #ifdefs, but then there is absolutely
> zero overhead for the fully compliant SDHCI controllers.
> 

I can't say this makes me happy either, but I think it's acceptable for
now so that we can move forward. I'd like a common code path for this
thing, but I think I'm going to have to put a bit more time into it
myself than I currently have available.

> (So far it's just on top of this series, but I can incorporate it
> into the "sdhci: Add support for bus-specific IO memory accessors"
> patch, if you like).
> 

Please do. Have one patch add some code and another remove it in the
same set is just silly. :)

Rgds
-- 
     -- Pierre Ossman

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