linux-kernel - Re: [patch 4/4] sdio: disable CD resistor

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Message-ID: <20070807170826.0c32801b@poseidon.drzeus.cx>
Date:	Tue, 7 Aug 2007 17:08:26 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	David Vrabel <david.vrabel@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/4] sdio: disable CD resistor

On Tue, 07 Aug 2007 15:46:36 +0100
David Vrabel <david.vrabel@....com> wrote:

> 
> Is there an example driver for a host that uses pin 1/DAT3 sensing for
> card detection?  I'm curious about how removal detections work.
> 

Both wbsd and sdhci have experienced hardware with this. In sdhci this
is hidden completely in hardware, but wbsd has to do some funky logic
to handle the problem.

> App Note on card detection goes into the use of this resistor in more
> detail but I don't believe this document is publicly available :(.
> 

SD is a wonderful world. :/

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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