From: Pierre Ossman <drzeus-mmc@drzeus.cx>
To: David Brownell <david-b@pacbell.net>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [patch 2.6.28] mmc: warn about voltage mismatches
Date: Wed, 31 Dec 2008 19:27:25 +0100 [thread overview]
Message-ID: <20081231192725.1de9a8c6@mjolnir.drzeus.cx> (raw)
In-Reply-To: <200812310950.30478.david-b@pacbell.net>
On Wed, 31 Dec 2008 09:50:30 -0800
David Brownell <david-b@pacbell.net> wrote:
> From: David Brownell <dbrownell@users.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@users.sourceforge.net>
> ---
Queued.
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
rdesktop, core developer http://www.rdesktop.org
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prev parent reply other threads:[~2008-12-31 18:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-31 17:50 David Brownell
2008-12-31 18:27 ` Pierre Ossman [this message]
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