lkml.org 
[lkml]   [2009]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRE: [PATCH v2] powerpc/85xx: Add eSDHC support for MPC8536DS boards
Date
From


> -----Original Message-----
> From: Anton Vorontsov [mailto:avorontsov@ru.mvista.com]
> Sent: Friday, August 28, 2009 11:20 PM
> To: Hu Mingkai-B21284
> Cc: Kumar Gala; Ben Dooks; linux-kernel@vger.kernel.org;
> sdhci-devel@lists.ossman.eu; linuxppc-dev@ozlabs.org; Andrew
> Morton; Pierre Ossman; David Vrabel
> 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@ru.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,
>

Sorry, I also don't know the plan to MPC8569 CPU, but if I get any info,
I'll inform you ASAP. :-)

Best regards,
Mingkai

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


\
 
 \ /
  Last update: 2009-08-31 09:55    [W:0.041 / U:1.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site