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Subject: Re: /proc/pci deprecation?
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Richard Henderson <rth@twiddle.net>, Patrick Mochel <mochel@osdl.org>,
       Willy Tarreau <willy@w.ods.org>, Petr Vandrovec <VANDROVE@vc.cvut.cz>,
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Date: 09 Dec 2002 18:29:37 +0000
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On Mon, 2002-12-09 at 17:00, Linus Torvalds wrote:
> On 9 Dec 2002, Alan Cox wrote:
> > I wonder if this is why we have all these problems with VIA chipset
> > interrupt handling. According to VIA docs they _do_ use
> > PCI_INTERRUPT_LINE on integrated devices to select the IRQ routing
> > between APIC and PCI/ISA etc, as well as 0 meaning "IRQ disabled"
> 
> Whee.. That sounds like a load of crock in the first place, since the
> PCI_INTERRUPT_LINE thing should be just a scratch register as far as I
> know. However, it doesn't really matter - we definitely should never write
> to it anyway, so the VIA behaviour while strange should still be
> acceptable.

Tested and verified. If I leave it alone non apic mode works. To use
APIC mode I have to write the new IRQ value into that register. I've
shoved that into the driver for now, since its a demented chip specific
horror.

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