[lkml]   [2010]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v2] mmc: lower init clock frequency to 300kHz
On Sat, 2 Jan 2010 20:07:01 +1100
Ben Nizette <> wrote:

> Pierre, thoughts? All my cards were borderline spec but Hein's got a mainstream, common card which seems to completely ignore the spec. Can we just take the few-hundred-uS hit and allow initialization down at the bottom end, say 100kHz?

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.

Basically you'll just have to try something and watch the bug reports.
Perhaps doing the bisect approach and choosing the intermediate value
each time? I.e. halvway between 400 and 100 for now (250). If that is
too fast, then halway between that and 100 (175), and so on.

-- Pierre Ossman

WARNING: This correspondence is being monitored by FRA, a
Swedish intelligence agency. Make sure your server uses
encryption for SMTP traffic and consider using PGP for
end-to-end encryption.
[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2010-01-02 13:11    [W:0.041 / U:3.732 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site