linux-kernel - Re: [PATCH 3/4] [MMC] mmc_spi: add polling support for the card detect line

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Date:	Thu, 22 May 2008 21:34:32 +0200
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	avorontsov@...mvista.com
Cc:	Kumar Gala <galak@...nel.crashing.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Jochen Friedrich <jochen@...am.de>,
	Timur Tabi <timur@...escale.com>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 3/4] [MMC] mmc_spi: add polling support for the card
 detect line

On Thu, 22 May 2008 22:17:13 +0400
Anton Vorontsov <avorontsov@...mvista.com> wrote:

> On Wed, May 21, 2008 at 09:28:31PM +0200, Pierre Ossman wrote:
> > 
> > Fair enough. You should probably add a comment about this somewhere so
> > that people do not call get_cd() in the core request function and
> > similar places. Place it so that both get_cd() and get_ro() are covered
> > though, as it should be relevant for both.
> 
> I think this is applicable to the .set_ios() too.
> 

Indeed. That tends to be more obvious that it is costly though.

> > 
> > This can be solved by allowing get_cd() to return an error that will be
> > treated as if get_cd() wasn't defined. -ENODEV seems suitable.
> 
> -ENOSYS (not implemented) sounds better for this purpose...
> 

Even better. :)

> > (get_ro() needs the same treatment, but I haven't gotten around to
> > that)
> 
> Ok. How about this version?
> 

Perfect. Unless there is some way you can pass flags in platform data?
Using the lack of an init() to determine the need for polling is a bit
circumstantial.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org
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