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SubjectPATCH 2.4.5.1: Fix Via interrupt routing issues
For those of you with Via interrupting routing issues (or
interrupt-not-being-delivered issues, etc), please try out this patch
and let me know if it fixes things. It originates from a tip from
Adrian Cox... thanks Adrian!

--
Jeff Garzik | Game called on account of naked chick
Building 1024 |
MandrakeSoft |Index: drivers/pci/quirks.c
===================================================================
RCS file: /cvsroot/gkernel/linux_2_4/drivers/pci/quirks.c,v
retrieving revision 1.1.1.35
diff -u -r1.1.1.35 quirks.c
--- drivers/pci/quirks.c 2001/05/02 09:26:23 1.1.1.35
+++ drivers/pci/quirks.c 2001/05/13 17:22:18
@@ -12,6 +12,7 @@
* use the PowerTweak utility (see http://powertweak.sourceforge.net).
*/

+#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@@ -238,7 +239,34 @@
quirk_io_region(dev, smb, 16, PCI_BRIDGE_RESOURCES + 2);
}

+
+/* we will likely need a better ifdef, something like
+ * ifdef CONFIG_EXTERNAL_APIC
+ */
+#ifdef CONFIG_X86_IO_APIC
+extern int nr_ioapics;
+
/*
+ * VIA 686A/B: If an IO-APIC is active, we need to route all on-chip
+ * devices to the external APIC.
+ */
+static void __init quirk_via_ioapic(struct pci_dev *dev)
+{
+ u8 tmp;
+
+ if (nr_ioapics < 1)
+ tmp = 0; /* nothing routed to external APIC */
+ else
+ tmp = 0x1f; /* all known bits (4-0) routed to external APIC */
+
+ /* Offset 0x58: External APIC IRQ output control */
+ pci_write_config_byte (dev, 0x58, tmp);
+}
+
+#endif /* CONFIG_X86_IO_APIC */
+
+
+/*
* PIIX3 USB: We have to disable USB interrupts that are
* hardwired to PIRQD# and may be shared with an
* external device.
@@ -322,6 +350,14 @@
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_2, quirk_piix3_usb },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_2, quirk_piix3_usb },
{ PCI_FIXUP_FINAL, PCI_ANY_ID, PCI_ANY_ID, quirk_cardbus_legacy },
+
+/* we will likely need a better ifdef, something like
+ * ifdef CONFIG_EXTERNAL_APIC
+ */
+#ifdef CONFIG_X86_IO_APIC
+ { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, quirk_via_ioapic },
+#endif
+
{ 0 }
};
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