linux-kernel - Re: [PATCH v2] powerpc/85xx: Add eSDHC support for MPC8536DS boards

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Message-ID: <20090828151953.GA14776@oksana.dev.rtsoft.ru>
Date:	Fri, 28 Aug 2009 19:19:53 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Hu Mingkai-B21284 <Mingkai.Hu@...escale.com>
Cc:	Kumar Gala <galak@...nel.crashing.org>, Ben Dooks <ben@...ff.org>,
	linux-kernel@...r.kernel.org, sdhci-devel@...ts.ossman.eu,
	linuxppc-dev@...abs.org, Andrew Morton <akpm@...ux-foundation.org>,
	Pierre Ossman <pierre@...man.eu>,
	David Vrabel <david.vrabel@....com>
Subject: Re: [PATCH v2] powerpc/85xx: Add eSDHC support for MPC8536DS boards

On Fri, Aug 28, 2009 at 07:02:51PM +0800, Hu Mingkai-B21284 wrote:
> > On Tue, Aug 18, 2009 at 08:24:17PM -0500, Kumar Gala wrote:
> > > 
> > > On Aug 18, 2009, at 6:38 PM, Anton Vorontsov wrote:
> > > 
> > > >This patch simply adds sdhci node to the device tree.
> > > >
> > > >We specify clock-frequency manually, so that eSDHC will 
> > work without 
> > > >upgrading U-Boot. Though, that'll only work for default setup (1500
> > > >MHz) on new board revisions. For non-default setups, it's 
> > recommended 
> > > >to upgrade U-Boot, since it will fixup clock-frequency 
> > automatically.
> > > >
> > > >Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> > > 
> > > out of interest the 85xx eSDHC don't need the sdhci,wp-inverted 
> > > property?
> > 
> > Yes, eSDHC controllers in MPC85xx report normal state in its 
> > registers.
> > 
> 
> Hi Anton,
> 
> The eSDHC controller in different silicon version on MPC8536  reports
> different WP state in the register PRSSTAT:

Thanks a million for the heads up!

Yes, the manual I used ("MPC8536ERM Rev. 0 10/2008") doesn't mention
that, but the newer manual that I just downloaded ("MPC8536ERM Rev. 1
05/2009") does.

[...]
> For silicon 1.0,  the macro SDHCI_QUIRK_INVERTED_WRITE_PROTECT is also
> defined,
> so the dirver will report the error WP state in function sdhci_get_ro.

Not any longer. We don't actually define it for any 85xx CPUs.

I need to think how should we handle all these WP inversions. :-)

So, we have inversion in BCSR (depending on the BCSR revision),
configurable inversion in CPU via GENCFGR for 1.1 silicon, and
non-configurable non-inverted reporting for 1.0 silicon...

Do you know if there are any plans to fix the WP inversion for
MPC8569E-MDS boards, or make something like GENCFGR for MPC8569
CPUs?

Thanks,

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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