[PATCH] Re: interrupt problem with MPS 1.4 / not with MPS 1.1 ?

[Jeff Garzik]

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Does this patch fix things for you, such that MPS 1.1 and MPS 1.4 both
work?
-- 
Jeff Garzik      | Disbelief, that's why you fail.
Building 1024    |
MandrakeSoft     |
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diff -urN linux-2.4.5/drivers/pci/quirks.c linux.viairq/drivers/pci/quirks.c
--- linux-2.4.5/drivers/pci/quirks.c	Sat May 19 20:43:06 2001
+++ linux.viairq/drivers/pci/quirks.c	Fri Jun  1 16:33:21 2001
@@ -17,6 +17,7 @@
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/delay.h>
 
 #undef DEBUG
 
@@ -267,6 +268,8 @@
 /*
  * VIA 686A/B: If an IO-APIC is active, we need to route all on-chip
  * devices to the external APIC.
+ *
+ * TODO: this should be done at IRQ assign time (pci_enable_device call)
  */
 static void __init quirk_via_ioapic(struct pci_dev *dev)
 {
@@ -277,6 +280,8 @@
 	else
 		tmp = 0x1f; /* all known bits (4-0) routed to external APIC */
 		
+	printk(KERN_INFO "PCI: Setting Via APIC control\n");
+
 	/* Offset 0x58: External APIC IRQ output control */
 	pci_write_config_byte (dev, 0x58, tmp);
 }
@@ -285,6 +290,35 @@
 
 
 /*
+ * 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.
+ *
+ * TODO: this should be done at IRQ assign time (pci_enable_device call)
+ */
+static void __init quirk_via_irqpic(struct pci_dev *dev)
+{
+	u8 tmp;
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &tmp);
+        if ((tmp & 0x0F) != dev->irq) {
+		printk(KERN_INFO "PCI: Via IRQ fixup for %s, from %d to %d\n",
+		       dev->slot_name, tmp, (tmp & 0xF0) | dev->irq);
+                udelay (15);
+
+                tmp &= 0xF0;
+                tmp |= dev->irq;
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, tmp);
+	}
+}
+
+
+/*
  * PIIX3 USB: We have to disable USB interrupts that are
  * hardwired to PIRQD# and may be shared with an
  * external device.
@@ -372,6 +406,11 @@
 #ifdef CONFIG_X86_IO_APIC 
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686,	quirk_via_ioapic },
 #endif
+
+	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C586_2,	quirk_via_irqpic },
+	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_4,	quirk_via_irqpic },
+	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_5,	quirk_via_irqpic },
+	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_6,	quirk_via_irqpic },
 
 	{ 0 }
 };
diff -urN linux-2.4.5/drivers/sound/via82cxxx_audio.c linux.viairq/drivers/sound/via82cxxx_audio.c
--- linux-2.4.5/drivers/sound/via82cxxx_audio.c	Tue May  1 19:05:00 2001
+++ linux.viairq/drivers/sound/via82cxxx_audio.c	Fri Jun  1 16:32:25 2001
@@ -3012,7 +3012,6 @@
 {
 	int rc;
 	struct via_info *card;
-	u8 tmp;
 	static int printed_version = 0;
 
 	DPRINTK ("ENTER\n");
@@ -3107,19 +3106,6 @@
 	if (rc) {
 		printk (KERN_ERR PFX "interrupt init failed, aborting\n");
 		goto err_out_have_proc;
-	}
-
-	pci_read_config_byte (pdev, 0x3C, &tmp);
-	if ((tmp & 0x0F) != pdev->irq) {
-		printk (KERN_WARNING PFX "IRQ fixup, 0x3C==0x%02X\n", tmp);
-		udelay (15);
-		tmp &= 0xF0;
-		tmp |= pdev->irq;
-		pci_write_config_byte (pdev, 0x3C, tmp);
-		DPRINTK ("new 0x3c==0x%02x\n", tmp);
-	} else {
-		DPRINTK ("IRQ reg 0x3c==0x%02x, irq==%d\n",
-			tmp, tmp & 0x0F);
 	}
 
 	printk (KERN_INFO PFX "board #%d at 0x%04lX, IRQ %d\n",

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