From: "Michał Mirosław" <mirqus@gmail.com>
To: 梁亦飞 <dinuxlyf@gmail.com>
Cc: linux-mmc@vger.kernel.org
Subject: Re: Question about ACMD42
Date: Sat, 4 Sep 2010 14:15:50 +0200 [thread overview]
Message-ID: <AANLkTimh=DWQNh=01sR8c1enhnCrahMqJXnt-HkPq8uD@mail.gmail.com> (raw)
In-Reply-To: <AANLkTi=RUmOzwM3vzzjK=h9aQv5FV2XDmAJDWT246F0H@mail.gmail.com>
2010/9/3 梁亦飞 <dinuxlyf@gmail.com>:
> Hi ,
> This might be a stupid question, in <<Physical Layer Simplified
> Specification Version 2.00>>,there is a command SET_CLR_CARD_
> DETECT, as spec discribed Connect[1]/Disconnect[0] the 50 KOhm pull-up
> resistor on CD/DAT3 (pin 1) of
> the card.
> If this command is use to switch the card beteewn the DAT[3] and
> CD mode, why i don't see it's being
> use in kernel. Under what circumstance we should use this command?
The pullup is disabled for SDIO part, but not for memory part. I would
call it a bug. This should go to mmc_sd_setup_card() in sd.c. I'll
send a fix after I get my dev machine up, unless someone beats me to
it.
Best Regards,
Michał Mirosław
prev parent reply other threads:[~2010-09-04 12:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 6:29 Question about ACMD42 梁亦飞
2010-09-04 12:15 ` Michał Mirosław [this message]
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