diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 245d2cd..1812ae7 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2595,9 +2595,37 @@
 static int __init pci_apply_final_quirks(void)
 {
 	struct pci_dev *dev = NULL;
+	u8 cls = 0;
+	u8 tmp;
+
+	if (pci_cache_line_size)
+		printk(KERN_DEBUG "PCI: CLS %u bytes\n",
+		       pci_cache_line_size << 2);
 
 	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 		pci_fixup_device(pci_fixup_final, dev);
+		/*
+		 * If arch hasn't set it explicitly yet, use the CLS
+		 * value shared by all PCI devices.  If there's a
+		 * mismatch, fall back to the default value.
+		 */
+		if (!pci_cache_line_size) {
+			pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &tmp);
+			if (!cls)
+				cls = tmp;
+			if (!tmp || cls == tmp)
+				continue;
+
+			printk(KERN_DEBUG "PCI: CLS mismatch (%u != %u), "
+			       "using %u bytes\n", cls << 2, tmp << 2,
+			       pci_dfl_cache_line_size << 2);
+			pci_cache_line_size = pci_dfl_cache_line_size;
+		}
+	}
+	if (!pci_cache_line_size) {
+		printk(KERN_DEBUG "PCI: CLS %u bytes, default %u\n",
+		       cls << 2, pci_dfl_cache_line_size << 2);
+		pci_cache_line_size = cls;
 	}
 
 	return 0;