linux-kernel - Re: [v2 PATCH 1/1] powerpc/4xx: enable and fix pcie gen1/gen2 on the 460sx

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Date:	Mon, 18 Jul 2011 08:31:01 -0500
From:	Ayman El-Khashab <ayman@...hashab.com>
To:	Tony Breeds <tony@...eyournoodle.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 1/1] powerpc/4xx: enable and fix pcie gen1/gen2 on
 the 460sx

On Mon, Jul 18, 2011 at 02:01:15PM +1000, Tony Breeds wrote:
> On Fri, Jul 15, 2011 at 11:40:27AM -0500, Ayman Elkhashab wrote:
> 
> > @@ -1582,8 +1628,8 @@ static int __init ppc4xx_setup_one_pciex_POM(struct ppc4xx_pciex_port	*port,
> >  		dcr_write(port->dcrs, DCRO_PEGPL_OMR2BAH, lah);
> >  		dcr_write(port->dcrs, DCRO_PEGPL_OMR2BAL, lal);
> >  		dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKH, 0x7fffffff);
> > -		/* Note that 3 here means enabled | single region */
> > -		dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKL, sa | 3);
> > +		dcr_write(port->dcrs, DCRO_PEGPL_OMR2MSKL,
> > +				sa | DCRO_PEGPL_OMRxMSKL_VAL);
> 
> Didn't you just change "sa | 3" to "sa | 1" ?
> 

Yes, but I think that is correct for it to be "1".  The data
sheets for these parts that I checked had bit 1 marked as
reserved.  Only OMR1MSKL and OMR3MSKL had extra definitions
such as the _IO and _UOT.  The parts I checked which were
the sheets for the EX and SX (which cover another 6 or 7
parts) all had it with just a single bit defined on that
register.

Ayman

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