Date: Sun, 5 Apr 2009 20:33:17 +0200
From: Pierre Ossman <drzeus-list@drzeus.cx>
To: =?UTF-8?B?Sm9zw6kgTWFyw63CrWEgRmVybsOhbmRleiBHb256w6FsZXo=?= 
	<josemariafg@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] mmc: Some microSD cards are not recognized by
 PCIxx12 SDA controller
Message-ID: <20090405203317.72ce6aff@mjolnir.ossman.eu>
In-Reply-To: <49CBAF36.1010203@gmail.com>
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	<20090324211748.30cd7429@mjolnir.ossman.eu>
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On Thu, 26 Mar 2009 17:37:10 +0100
Jos=C3=A9 Mar=C3=AD=C2=ADa Fern=C3=A1ndez Gonz=C3=A1lez <josemariafg@gmail.=
com> wrote:

> Pierre Ossman wrote:
> > On Wed, 25 Mar 2009 09:00:56 +0100
> > Jos=C3=A9 Mar=C3=AD=C2=ADa Fern=C3=A1ndez Gonz=C3=A1lez <josemariafg@gm=
ail.com> wrote:
> >=20
> >> As I'm going to install 2.6.29 today, I can test the patch with it and=
 HZ=3D100.
> >=20
> > 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. :)
> >=20
> > Rgds
>=20
> I have been testing the patch with kernel 2.6.29 and a couple of cards (t=
he Transcend 2GB microSD and a EZ Memory 8GB SDHC) in a few cases:
>=20
> *	HZ=3D300 + tickless + desktop preemption
> *	HZ=3D100 + tickless + desktop preemption
> *	HZ=3D100 + desktop preemption
> *	HZ=3D100 + low latency desktop preemption
> *	HZ=3D1000 + tickless + desktop preemption
>=20
> and it worked with no problem. I don't know if I have forgotten any obvio=
us corner case. Perhaps I should have tested with no preemption...
>=20

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
--=20
     -- Pierre Ossman

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

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