Re: how I know if a interrupt is ioapic_edge_type or ioapic_level_type? [Was Re: [Fwd: Re: [Linux-usb-users] Fwd: Re: 2.6.17-rc6-mm2 - USB issues]]

[Sergio Monteiro Basto <sergio@sergiomb.no-ip.org>]

On Thu, 2006-06-22 at 16:25 -0700, Randy.Dunlap wrote:
> No idea about that.
> I think that you still didn't answer my question, or maybe I
> didn't ask it well enough.  What device are you having problems
> with? I don't mean what chipset, I mean what device that you
> touch...
> 

I'd like to give you one answer , but  I don't have one problem with one
device, I bought (accidentally) one VIA with a Pentium dual-core, which
have a bunch of problems. 

> 
> > --- orig/drivers/pci/quirks.c 2006-06-21 20:25:41.000000000 +1000
> > +++ linux-2.6.17-rc6-mm2/drivers/pci/quirks.c 2006-06-21
> 20:25:08.000000000 +1000
> > @@ -662,13 +662,7 @@
> >               pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
> new_irq);
> >       }
> >  }
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C586_0, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C586_1, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C586_2, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C586_3, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C686, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C686_4, quirk_via_irq);
> > -DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA,
> PCI_DEVICE_ID_VIA_82C686_5, quirk_via_irq);
> > +DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
> quirk_via_irq);
> >  
> >  /*
> >   * VIA VT82C598 has its device ID settable and many BIOSes
> > 
> > 
> > But do you know or not ? how I know if dev->irq is XT-pic ? 
> 
> I don't see a way to know that currently.  It could be added
> somehow if it's really required.  So far I haven't seen a full
> problem description or requirement for this. 

Well, this is based in tests along this 4 years, with my two computers.
Like Bjorn said, we don't have any specification of VIA chipsets. But I
like to try, use this quirks only if system don't have IO-APICs enabled.
Many VIA systems work like that, for example my old laptop.

For me, I know that my old laptop needs the quirks and run with
interrupts in XT-PIC, and with my new desktop, I quit sure that don't
need the quirks and system runs with interrupts in IO-APIC-edge and
IO-APIC-level. 

Based in, what I read in this original thread
http://lkml.org/lkml/2005/8/18/92 , seems to me, that we could try this
solution, if we have a easy way to know what kind of interrupts have the
device. 

Thanks Randy for your time,
-- 
Sérgio M. B.

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