patch-2.3.99-pre7 linux/arch/i386/kernel/pci-i386.c

• Lines: 23
• Date: Sat Apr 29 10:19:57 2000
• Orig file: v2.3.99-pre6/linux/arch/i386/kernel/pci-i386.c
• Orig date: Tue Apr 11 15:09:12 2000

diff -u --recursive --new-file v2.3.99-pre6/linux/arch/i386/kernel/pci-i386.c linux/arch/i386/kernel/pci-i386.c
@@ -330,12 +330,18 @@
  *  If we set up a device for bus mastering, we need to check the latency
  *  timer as certain crappy BIOSes forget to set it properly.
  */
+unsigned int pcibios_max_latency = 255;
+
 void pcibios_set_master(struct pci_dev *dev)
 {
 	u8 lat;
 	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
-	if (lat < 16) {
-		printk("PCI: Increasing latency timer of device %s to 64\n", dev->slot_name);
-		pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
-	}
+	if (lat < 16)
+		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+	else if (lat > pcibios_max_latency)
+		lat = pcibios_max_latency;
+	else
+		return;
+	printk("PCI: Setting latency timer of device %s to %d\n", dev->slot_name, lat);
+	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 }