From: Pierre Ossman <pierre@ossman.eu>
To: Ben Nizette <bn@niasdigital.com>
Cc: Hein_Tibosch <hein_tibosch@yahoo.es>,
Sascha Hauer <s.hauer@pengutronix.de>,
Adrian Hunter <adrian.hunter@nokia.com>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Matt Fleming <matt@console-pimps.org>
Subject: Re: [PATCH v2] mmc: lower init clock frequency to 300kHz
Date: Sat, 2 Jan 2010 13:08:09 +0100 [thread overview]
Message-ID: <20100102130809.121b7e10@mjolnir.ossman.eu> (raw)
In-Reply-To: <49985427-DCB9-40E1-815B-43C812B41DE3@niasdigital.com>
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On Sat, 2 Jan 2010 20:07:01 +1100
Ben Nizette <bn@niasdigital.com> 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.
Rgds
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next prev parent reply other threads:[~2010-01-02 12:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-01 23:49 [PATCH] MMC Core: Drop initialization frequency floor to 50kHz Ben Nizette
2009-07-02 7:18 ` Pierre Ossman
2009-07-02 11:10 ` Ben Nizette
2009-07-02 11:58 ` Haavard Skinnemoen
2009-07-02 12:17 ` Ben Nizette
[not found] ` <4B3E570C.2060602@yahoo.es>
[not found] ` <63809451-ED1D-487A-AE63-F72B23D136D8@niasdigital.com>
[not found] ` <4B3F019F.6010306@yahoo.es>
2010-01-02 9:07 ` [PATCH v2] mmc: lower init clock frequency to 300kHz Ben Nizette
2010-01-02 12:08 ` Pierre Ossman [this message]
2010-01-02 22:23 ` [PATCH v3] mmc: Make ID freq configurable Ben Nizette
2010-01-02 23:04 ` Robert Hancock
2010-01-02 23:38 ` Pierre Ossman
2010-01-03 8:00 ` Hein_Tibosch
2010-01-04 21:07 ` Hein_Tibosch
2010-01-05 12:24 ` Sascha Hauer
2010-01-04 21:58 ` Hein_Tibosch
2010-08-27 20:44 ` Chris Ball
2010-08-28 0:44 ` Hein_Tibosch
2010-01-01 23:11 [PATCH v2] mmc: lower init clock frequency to 300kHz Ben Nizette
2010-01-06 7:01 ` Pavel Machek
2010-01-06 9:01 ` Hein_Tibosch
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