On Tuesday 16 August 2005 9:26 am, Karsten Wiese wrote:
> What about the following version?
> quirk_via_686irq() only works on pci_devs that are part of the 686.
> Sooner or later there'll be more VIA southbridge types, which will
> not need quirk_via_irq() like the 8237.
Do you have VIA spec references to support this? I had a quick
look, but couldn't find anything specific about which VIA devices
need the quirk and which don't.
As I understand it, you're not making a functional change here,
only getting rid of some messages in the log. If that's true,
I'm hesitant about making more changes without information from
VIA.
> > ------
> /*
> * Via 686A/B: The PCI_INTERRUPT_LINE register for the on-chip
> * devices, USB0/1, AC97, MC97, and ACPI, has an unusual feature:
> * when written, it makes an internal connection to the PIC.
> * For these devices, this register is defined to be 4 bits wide.
> * Normally this is fine. However for IO-APIC motherboards, or
> * non-x86 architectures (yes Via exists on PPC among other places),
> * we must mask the PCI_INTERRUPT_LINE value versus 0xf to get
> * interrupts delivered properly.
> */
> static void quirk_via_686irq(struct pci_dev *dev)
> {
> u8 irq, new_irq;
> /*
> * The ISA bridge is used to identify the 686.
> * It shares it's PCI slot and bus with the device under test
> * and is assigned to function 0.
> */
> unsigned int isa_bridge_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
> struct pci_dev * isa_bridge = pci_find_slot(dev->bus->number,
> isa_bridge_devfn);
>
> if (isa_bridge == NULL || isa_bridge->vendor != PCI_VENDOR_ID_VIA ||
> isa_bridge->device != PCI_DEVICE_ID_VIA_82C686)
> return; /* We are not on a 686. Lets leave */
>
> 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",
> 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_1,
> quirk_via_686irq);
> DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2,
> quirk_via_686irq);
> DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4,
> quirk_via_686irq);
> DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5,
> quirk_via_686irq);
> DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_6,
> quirk_via_686irq);
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