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SubjectRe: VIA IRQ quirk fixup only in XT-PIC mode Take 3
On Mon, 04 Sep 2006 01:42:47 +0100
Sergio Monteiro Basto <sergio@sergiomb.no-ip.org> wrote:

> Hi, this patch (now for 2.6.18-rc5).
>
>
> I found, on my new VIA with IO-APIC working well, that quirks aren't
> good/needed.
> After, I found this interesting email http://lkml.org/lkml/2005/8/13/30
> by Karsten Wiese, after, Alan Cox writes this
> http://lkml.org/lkml/2005/8/16/160 (on same thread) and Karsten Wiese
> end ups with the solution on http://lkml.org/lkml/2005/8/18/92, which I
> want try to implement.
> I have 2 VIAs with almost same IDs (others reporters have
> with exactly the same IDs) and in ones I need the quirks and in others
> don't, because one don't have APIC enabled, the other have it !?!
>
> we have other reported of the same problem
> http://lkml.org/lkml/2006/7/30/59
> and
> http://lkml.org/lkml/2006/9/1/106
>
> Checking my emails that I send to Len Brown on May of 2005 about this
> subject. I found, what I want, is just revert one patch of Bjorn
> Helgaas, between kernel 2.6.12-rc5 and 6.14.
> Check this out
> http://sourceforge.net/mailarchive/message.php?msg_id=11858102
>
> To finish I want put clear, the great work of Bjorn Helgaas which have
> made all of this, but at the end, I suspect with one false positive
> report introduce this regression, that I hopefully found.
>

This thing is getting embarrassing.

> diff linux-2.6.17.x86_64/drivers/pci/quirks.c.orig linux-2.6.17.x86_64/drivers/pci/quirks.c -up
> --- linux-2.6.17.x86_64/drivers/pci/quirks.c.orig 2006-09-04 01:37:09.000000000 +0100
> +++ linux-2.6.17.x86_64/drivers/pci/quirks.c 2006-09-04 01:40:16.000000000 +0100
> @@ -654,22 +654,24 @@ static void quirk_via_irq(struct pci_dev
> {
> u8 irq, new_irq;
>
> +#ifdef CONFIG_X86_IO_APIC
> + if (nr_ioapics && !skip_ioapic_setup)
> + return;
> +#endif
> +#ifdef CONFIG_ACPI
> + if (acpi_irq_model != ACPI_IRQ_MODEL_PIC)
> + return;
> +#endif
> new_irq = dev->irq & 0xf;
> pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
> if (new_irq != irq) {
> - printk(KERN_INFO "PCI: VIA IRQ fixup for %s, from %d to %d\n",
> + printk(KERN_INFO "PCI: VIA PIC IRQ fixup for %s, from %d to %d\n",
> pci_name(dev), irq, new_irq);
> udelay(15); /* unknown if delay really needed */
> 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
>

There's a similar patch in -mm: pci-quirk_via_irq-behaviour-change.patch.
Does that work for you?


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