linux-kernel - Re: [PATCH 1/1] mmc: Some microSD cards are not recognized by PCIxx12 SDA controller

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Date:	Tue, 07 Apr 2009 01:30:28 +0200
From:	José María Fernández González 
	<josemariafg@...il.com>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mmc: Some microSD cards are not recognized by PCIxx12
 SDA controller

It is curious. I have concentrated my tests on 2.6.29 with HZ=100 and no preemption, and I have done next tests with my microSD card and laptop:

*	mmc_delay(2) -> FAIL
*	mdelay(2) -> FAIL
*	mmc_delay(10) -> Works!
*	mdelay(10) -> Works!

And by mistake I found that:

*	msleep(2) -> Works!

	Best Regards,
		José María

Pierre Ossman wrote:
> 
> All of them will result in a sleep though. Preferably, I'd like to now
> the minimum delay you need to get things working. Change from
> mmc_delay() to mdelay() to make sure there aren't any sleeps (which
> generally take quite some time to complete).
> 
> Rgds

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