Messages in this thread | | | Date | Wed, 31 Dec 2008 19:27:25 +0100 | From | Pierre Ossman <> | Subject | Re: [patch 2.6.28] mmc: warn about voltage mismatches |
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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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