--- quirks.c-2.4.4	Mon Apr 30 01:50:36 2001
+++ quirks.c	Mon Apr 30 03:01:28 2001
@@ -88,23 +88,36 @@
  *	VIA Apollo KT133 needs PCI latency patch
  *	Made according to a windows driver based patch by George E. Breese
  *	see PCI Latency Adjust on http://www.viahardware.com/download/viatweak.shtm
+ *      Also see http://home.tiscalinet.de/au-ja/review-kt133a-1-en.html for
+ *      the info on which Mr Breese based his work.
  */
 static void __init quirk_vialatency(struct pci_dev *dev)
 {
 	u8 r70;
+	u8 rev;
 
-	printk(KERN_INFO "Applying VIA PCI latency patch.\n");
-	/*
-	 *    In register 0x70, mask off bit 2 (PCI Master read caching)
-	 *    and 1 (Delay Transaction)
-	 */
-	pci_read_config_byte(dev, 0x70, &r70);
-	r70 &= 0xf9;
-	pci_write_config_byte(dev, 0x70, r70);
-	/*
-	 *    Turn off PCI Latency timeout (set to 0 clocks)
-	 */
-	pci_write_config_byte(dev, 0x75, 0x80);
+	/* we test for 686B by revision, only apply patch then (cpbotha@ieee.org) */
+	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
+        /* 0x40 - 0x4f == 686B, 0x10 - 0x2f == 686A; thanks Dan Hollis */
+	if (rev >= 0x40 && rev <= 0x4f)
+	{
+        	printk(KERN_INFO "Applying VIA PCI latency patch (found VT82C686B).\n");
+		/*
+	 	*    In register 0x70, mask off bit 2 (PCI Master read caching)
+	 	*    and 1 (Delay Transaction)
+	 	*/
+		pci_read_config_byte(dev, 0x70, &r70);
+		r70 &= 0xf9;
+		pci_write_config_byte(dev, 0x70, r70);
+		/*
+	 	 *    Turn off PCI Latency timeout (set to 0 clocks)
+	 	 */
+		pci_write_config_byte(dev, 0x75, 0x80);
+	}
+	else
+	{
+		printk(KERN_INFO "Found VT82C686A, not applying VIA latency patch.\n");
+	}
 }
 
 /*
@@ -312,7 +325,7 @@
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_INTEL, 	PCI_DEVICE_ID_INTEL_82443BX_2, 	quirk_natoma },
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_SI,	PCI_DEVICE_ID_SI_5597,		quirk_nopcipci },
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_SI,	PCI_DEVICE_ID_SI_496,		quirk_nopcipci },
-	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8363_0,	quirk_vialatency },
+	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686,	quirk_vialatency },
 	{ PCI_FIXUP_FINAL,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C597_0,	quirk_viaetbf },
 	{ PCI_FIXUP_HEADER,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C597_0,	quirk_vt82c598_id },
 	{ PCI_FIXUP_HEADER,	PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C586_3,	quirk_vt82c586_acpi },