linux-kernel - Re: [PATCH] mmc/sdio: don't allow interface to runtime-suspend until probe is finished.

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Message-ID: <CAMLZHHRPvTSMAte_MO2VA-0B8_x=iPiY5L1T=pEBqn+zp62Arw@mail.gmail.com>
Date:	Mon, 5 Dec 2011 13:17:29 -0600
From:	Daniel Drake <dsd@...top.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Ohad Ben-Cohen <ohad@...ery.com>, linux-mmc@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Joe Woodward <jw@...rafix.co.uk>, Chris Ball <cjb@...top.org>
Subject: Re: [PATCH] mmc/sdio: don't allow interface to runtime-suspend until
 probe is finished.

On Mon, Dec 5, 2011 at 1:06 PM, NeilBrown <neilb@...e.de> wrote:
> The chip has a requirement that the reset line is held down during power-on,
> and raised shortly after (I don't know exactly how short).  So if you just
> remove power and give it back, the chip doesn't come up properly.

In another thread, Marvell confirmed that performing a SDIO reset is
sufficient, no reset line tweaking is needed in the face of a reset.

However, I would certainly advise playing with this reset line at the
point of failure - you could confirm if it is or isn't being tweaked
at this particular point, and if its not, you could try adjusting the
code to manipulate this line at this point to see if it helps at all.

Another area of experimentation is detailed here:
http://article.gmane.org/gmane.linux.kernel.mmc/11475
especially if you can confirm that mmc_send_if_cond is the source of
the failure.

Thanks,
Daniel
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