Re: [patch 2.6.28] mmc: warn about voltage mismatches
From: Pierre Ossman
Date: Wed Dec 31 2008 - 13:27:38 EST
On Wed, 31 Dec 2008 09:50:30 -0800
David Brownell <david-b@xxxxxxxxxxx> wrote:
> From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxxxxxxxx>
> ---
Queued.
--
-- Pierre Ossman
Linux kernel, MMC maintainer http://www.kernel.org
rdesktop, core developer http://www.rdesktop.org
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