Abit KT7 IRQ routing

["Ville Syrjälä" <syrjala-ORSVBvAovxo@public.gmane.org>]

As I reported earlier my AGP card seems to get the wrong IRQ. It works but
one IRQ remains completely unused. I just turned on debugging in the PCI
code...

The AGP slot 01:00.0 doesn't have an entry in the PRT so the code will try
to derive it from the AGP bridge 00:01.0

I'm not sure this is relevant but I included it here anyway:
pci_irq-0318 [0001] [02] acpi_pci_irq_enable : No interrupt pin configured
for device 00:01.0

Here's the interesting output:
pci_irq-0242 [0001] [03] acpi_pci_irq_lookup   : Searching for PRT entry
for 00:01:00[A]
<snip>
pci_irq-0248 [0001] [03] acpi_pci_irq_lookup   : PRT entry not found
<snip>
pci_irq-0242 [0001] [04] acpi_pci_irq_lookup   : Searching for PRT entry
for 00:00:01[B]
            ^^^
Why does it think 01:00.0[A] == 00:01.0[B]? This is what causes it to get
the IRQ from LNKB instead of LNKA.

Looking at the code in pci_irq.c:

while (!irq && (bridge = bridge->bus->self)) {
  pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
  irq = acpi_pci_irq_lookup(0, bridge->bus->number, PCI_SLOT(bridge->devfn), pin);
}

So it seems that PCI_SLOT(brigde->devfn) is doing something wrong.

Any ideas?


PS.
I "fixed" the ISA sound card + SCSI CDROM problem by using a PCI sound
card. Something ISA related gets configured in a funny manner with ACPI.

-- 
Ville Syrjälä
syrjala-ORSVBvAovxo@public.gmane.org
http://www.sci.fi/~syrjala/


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