[patch] patch

usb-pci-quirk-verbose.patch (text/plain), 2.36 KB, created by Daniel Drake (RETIRED) on 2006-02-12 09:46:48 UTC

--- linux/drivers/usb/host/pci-quirks.c.orig	2006-02-12 17:47:32.000000000 +0000
+++ linux/drivers/usb/host/pci-quirks.c	2006-02-12 17:48:58.000000000 +0000
@@ -208,8 +208,9 @@ static void __devinit quirk_usb_handoff_
 		}
 		if (wait_time <= 0)
 			printk(KERN_WARNING "%s %s: BIOS handoff "
-					"failed (BIOS bug ?)\n",
-					pdev->dev.bus_id, "OHCI");
+					"failed (BIOS bug ?) %08x\n",
+					pdev->dev.bus_id, "OHCI",
+					readl(base + OHCI_CONTROL));
 
 		/* reset controller, preserving RWC */
 		writel(control & OHCI_CTRL_RWC, base + OHCI_CONTROL);
@@ -234,12 +235,19 @@ static void __devinit quirk_usb_disable_
 	u8	offset, cap_length;
 	int	count = 256/4;
 
-	if (!mmio_resource_enabled(pdev, 0))
+	printk("quirk_usb_disable_ehci()\n");
+	
+	if (!mmio_resource_enabled(pdev, 0)) {
+		printk("quirk_usb_disable_ehci() no mmio\n");
 		return;
+	}
 
 	base = ioremap_nocache(pci_resource_start(pdev, 0),
 				pci_resource_len(pdev, 0));
-	if (base == NULL) return;
+	if (base == NULL) {
+		printk("quirk_usb_disable_ehci() no base\n");
+		return;
+	}
 
 	cap_length = readb(base);
 	op_reg_base = base + cap_length;
@@ -261,6 +269,12 @@ static void __devinit quirk_usb_disable_
 				pr_debug("%s %s: BIOS handoff\n",
 						pdev->dev.bus_id, "EHCI");
 
+#if 0
+/* [e-mail] reports that some systems need SMI forced on,
+ * but that seems dubious in general (the BIOS left it off intentionally)
+ * and is known to prevent some systems from booting.  so we won't do this
+ * unless maybe we can determine when we're on a system that needs SMI forced.
+ */
 				/* BIOS workaround (?): be sure the
 				 * pre-Linux code receives the SMI
 				 */
@@ -270,6 +284,7 @@ static void __devinit quirk_usb_disable_
 				pci_write_config_dword(pdev,
 						offset + EHCI_USBLEGCTLSTS,
 						val | EHCI_USBLEGCTLSTS_SOOE);
+#endif
 			}
 
 			/* always say Linux will own the hardware
@@ -292,8 +307,8 @@ static void __devinit quirk_usb_disable_
 				 * it down, and hope nothing goes too wrong
 				 */
 				printk(KERN_WARNING "%s %s: BIOS handoff "
-						"failed (BIOS bug ?)\n",
-					pdev->dev.bus_id, "EHCI");
+						"failed (BIOS bug ?) %08x\n",
+					pdev->dev.bus_id, "EHCI", cap);
 				pci_write_config_byte(pdev, offset + 2, 0);
 			}
 
@@ -344,6 +359,8 @@ static void __devinit quirk_usb_disable_
 
 	iounmap(base);
 
+	printk("quirk_usb_disable_ehci() complete\n");
+
 	return;
 }