[PATCH] PCI: fix irq routing on acer travelmate 360 laptop

Fixes interrupt routing on acer travelmate 360 notebooks.  it looks like
the bios assigned the wrong pirq value for the cardbus bridge.  just
assigning irq 10 to all devices with pirq 0x63 would break second usb port.
pirq 0x68 seems to be right one for cardbus.
Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

arch/i386/kernel/dmi_scan.c

@@ -359,6 +359,21 @@ static __init int fix_broken_hp_bios_irq9(struct dmi_blacklist *d)
 	return 0;
 }
 
+/*
+ * Work around broken Acer TravelMate 360 Notebooks which assign Cardbus to
+ * IRQ 11 even though it is actually wired to IRQ 10
+ */
+static __init int fix_acer_tm360_irqrouting(struct dmi_blacklist *d)
+{
+#ifdef CONFIG_PCI
+	extern int acer_tm360_irqrouting;
+	if (acer_tm360_irqrouting == 0) {
+		acer_tm360_irqrouting = 1;
+		printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
+	}
+#endif
+	return 0;
+}
 /*
  *  Check for clue free BIOS implementations who use
  *  the following QA technique
@@ -844,6 +859,13 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
 			MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736")
 			} },
+
+	{ fix_acer_tm360_irqrouting, "Acer TravelMate 36x Laptop", {
+			MATCH(DMI_SYS_VENDOR, "Acer"),
+			MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
+			NO_MATCH, NO_MATCH
+			} },
+
  
 
 	/*
@@ -1033,6 +1055,13 @@ static __initdata struct dmi_blacklist dmi_blacklist[]={
 			MATCH(DMI_BOARD_NAME, "PR-DLS"),
 			MATCH(DMI_BIOS_VERSION, "ASUS PR-DLS ACPI BIOS Revision 1010"),
 			MATCH(DMI_BIOS_DATE, "03/21/2003") }},
+
+ 	{ disable_acpi_pci, "Acer TravelMate 36x Laptop", {
+ 			MATCH(DMI_SYS_VENDOR, "Acer"),
+ 			MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
+ 			NO_MATCH, NO_MATCH
+ 			} },
+
 #endif
 
 	{ NULL, }

arch/i386/pci/irq.c

@@ -23,6 +23,7 @@
 #define PIRQ_VERSION 0x0100
 
 int broken_hp_bios_irq9;
+int acer_tm360_irqrouting;
 
 static struct irq_routing_table *pirq_table;
 
@@ -745,6 +746,14 @@ static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
 		r->set(pirq_router_dev, dev, pirq, 11);
 	}
 
+	/* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
+	if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
+		pirq = 0x68;
+		mask = 0x400;
+		dev->irq = r->get(pirq_router_dev, dev, pirq);
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+	}
+
 	/*
 	 * Find the best IRQ to assign: use the one
 	 * reported by the device if possible.