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

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Message-ID: <20090405203317.72ce6aff@mjolnir.ossman.eu>
Date:	Sun, 5 Apr 2009 20:33:17 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	José María Fernández González 
	<josemariafg@...il.com>
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

On Thu, 26 Mar 2009 17:37:10 +0100
José María Fernández González <josemariafg@...il.com> wrote:

> Pierre Ossman wrote:
> > On Wed, 25 Mar 2009 09:00:56 +0100
> > José María Fernández González <josemariafg@...il.com> wrote:
> > 
> >> As I'm going to install 2.6.29 today, I can test the patch with it and HZ=100.
> > 
> > Please do. And try to determine where it breaks. I'd prefer if we don't
> > need to increase this yet again in a month because we were relying on
> > some scheduling latencies. :)
> > 
> > Rgds
> 
> I have been testing the patch with kernel 2.6.29 and a couple of cards (the Transcend 2GB microSD and a EZ Memory 8GB SDHC) in a few cases:
> 
> *	HZ=300 + tickless + desktop preemption
> *	HZ=100 + tickless + desktop preemption
> *	HZ=100 + desktop preemption
> *	HZ=100 + low latency desktop preemption
> *	HZ=1000 + tickless + desktop preemption
> 
> and it worked with no problem. I don't know if I have forgotten any obvious corner case. Perhaps I should have tested with no preemption...
> 

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
-- 
     -- Pierre Ossman

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

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