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Re: pchb@acpi again
From: Chuck Silvers <chuq%chuq.com@localhost>
Date: Sun, 21 Apr 2013 07:32:29 -0700
> On Mon, Apr 15, 2013 at 12:26:06AM +0300, Jukka Ruohonen wrote:
> > On Sat, Apr 13, 2013 at 06:26:19PM -0700, Chuck Silvers wrote:
> > > anyway, there are more problems with the new pchb,
> > > it's unhappy with the other two PCI root bridges in this system:
> > >
> > > pchb7 at acpi0 (PCI1, PNP0A03-8): ACPI Host-PCI Bridge
> > > pchb7: Can't get _PRT
> > > pchb8 at acpi0 (PCI2, PNP0A03-9): ACPI Host-PCI Bridge
> > > pchb8: Can't get _PRT
> > >
> > > these really don't have a _PRT method, but the rest of the code doesn't
> > > mind.
> > > they still attach fine with the mainbus attachment:
> > >
> > > I guess that's because even though these root bridges themselves don't
> > > have
> > > _PRT methods, the PCI bridges directly under them do have them.
> > > so we'll need to accomodate that somehow.
> > Why not just probe _PRT in the match()? According to the spec, _PRT should
> > be mandatory for all PCI root bridges.
> I'm confused... if we were to make pchb_acpi_match() fail to match when the
> root bridge device doesn't have a _PRT object, then how would you propose to
> support systems like mine where some of the PCI root bridge devices don't have
> _PRT objects?
Can you try processing of _CRS of pci_intr_map() written to the patch
Linux was performing this processing by MI layer(under drivers/acpi/).
This processing is also implemented by pchb_acpi.c.
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