On Sun, 3 Jan 2010 09:23:30 +1100 Ben Nizette <b...@niasdigital.com> wrote:
> >
> > Broken cards seem to be all over the spectrum, so I wouldn't be
> > suprised if you find ones that break if you go too low as well.
>
> Yea good point, though given there might not even be a One Freq to Rule Them
> All, how about:
>
> ---8<---
>
> From: Ben Nizette <b...@niasdigital.com>
> Subject: [PATCH v3] mmc: Make ID freq configurable
>
> While the SD spec specifies a range of frequencies for the ID phase from
> 100-400kHz, not all cards play by the rules. This patch adds a Kconfig
> option to allow the user to tweak this to their card/host config, though the
> default of 250kHz should be fine for all spec-abiding cards and most others
> besides.
>
> Signed-off-by: Ben Nizette <b...@niasdigital.com>
>
This is not a good solution. We all use the same pool of cards so we
should all be using the same init sequence. If there isn't a single
frequency where all cards will work, then we'll have to make something
more advanced where the kernel will try the init several times with
different clocking.
Rgds
--
-- Pierre Ossman
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