RE: lost thermal zones on 20040715 nc6000

[Alex Williamson <alex.williamson-VXdhtT5mjnY@public.gmane.org>]

  In case you didn't see, Linus posted a trivial patch that avoids the
problem for me:

http://marc.theaimsgroup.com/?l=linux-kernel&m=109339448319880&w=2

I still don't think we have any right to expose the hidden SMBus, it's
just asking for trouble, but...

	Alex

On Wed, 2004-08-25 at 09:27 +0800, Li, Shaohua wrote:
> I basically agree ACPI should access the region exclusively. The patch
> in Bug 3191 allows both SMBus driver and ACPI thermal zone driver access
> it. But there is a risk, we have no way to synchronize the access. Only
> one driver can access it one time. But somebody will argue SMBus driver
> has more benefit.
> 
> Thanks,
> Shaohua
> 
> >-----Original Message-----
> >From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-
> >admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Alex Williamson
> >Sent: Wednesday, August 25, 2004 5:24 AM
> >To: Moore, Robert
> >Cc: acpi-devel
> >Subject: RE: [ACPI] lost thermal zones on 20040715 nc6000
> >
> >
> >    I've nearly gotten to the bottom of this problem.  It's not an
> >interpreter bug, nor is it a BIOS bug.  The address we were trying to
> >read in AML is a SMBus controller address.  This address sits on the
> >hidden SMBus function in the Intel chipset.  Unfortunately, the PCI
> >quirks routine un-hides the devices.  So far this is all the same as
> the
> >way it behaved prior to the 20040715 code drop.
> >
> >   The new piece is the motherboard driver.  Now this driver comes in
> an
> >claims the I/O port region that the SMBus controller is using.  We've
> >un-hidden the PCI function, so PCI wants that resource range.  It can't
> >get it so it moves the SMBus BAR to a different address.  The AML is
> now
> >hosed cause it's hard-coded to use the address it programmed in (why
> >shouldn't it, the device is hidden).  Why are we un-hiding the SMBus
> >function?  The AML sets up an OpRegion for the address space it uses,
> so
> >should have exclusive access to that range.  Suggestions?  Thanks,
> >
> >	Alex
> >




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