linux-kernel - Re: [patch 2.6.28] mmc: warn about voltage mismatches

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Date:	Wed, 31 Dec 2008 19:27:25 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	David Brownell <david-b@...bell.net>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2.6.28] mmc: warn about voltage mismatches

On Wed, 31 Dec 2008 09:50:30 -0800
David Brownell <david-b@...bell.net> wrote:

> From: David Brownell <dbrownell@...rs.sourceforge.net>
> 
> Get rid of a silent failure mode when the MMC/SD host doesn't
> support the voltages needed to operate a given card, by
> adding a warning.  A 3.3V host and a 3.0V card, for example,
> no longer need to mysteriously just not work at all.
> 

Hmm... I have sort of always assumed that 3.3V was always required by
the host and card, but re-reading the specs that clearly isn't the case.

> This isn't the best diagnostic; ideally it would also tell
> what voltage the card and host support (and not just by
> dumping the bitmasks).
> 

Still, it's better than nothing.

> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> ---

Queued.

-- 
     -- Pierre Ossman

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

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