sb600/sb700 ohci experimental patch

[Andriy Gapon]

on 27/09/2009 15:17 Andriy Gapon said the following:
> Another idea of working around this:
> 1) in pci fixup code disable USB SMI for these chipsets
> 2) (optional) in ohci code skip takeover step
> Sounds messy.

BTW, just for the sake of experiment I did exactly what I suggested.
I've got the following messages:

kernel: ohci_controller_init:195: SMM active, request owner change
kernel: usbus0: SMM does not respond, resetting
kernel: ohci_controller_init:195: SMM active, request owner change
kernel: usbus1: SMM does not respond, resetting
kernel: ohci_controller_init:195: SMM active, request owner change
kernel: usbus3: SMM does not respond, resetting
kernel: ohci_controller_init:195: SMM active, request owner change
kernel: usbus4: SMM does not respond, resetting
kernel: ohci_controller_init:195: SMM active, request owner change
kernel: usbus6: SMM does not respond, resetting

And the register value stayed intact after initial programming, so no
re-programming was needed.

Here is the (dirty) hack:
diff --git a/sys/dev/pci/fixup_pci.c b/sys/dev/pci/fixup_pci.c
index 566e503..1463c24 100644
--- a/sys/dev/pci/fixup_pci.c
+++ b/sys/dev/pci/fixup_pci.c
@@ -53,6 +53,7 @@ static int	fixup_pci_probe(device_t dev);
 static void	fixwsc_natoma(device_t dev);
 static void	fixc1_nforce2(device_t dev);
 static void	fixrtc_piix4(device_t dev);
+static void	fixsmi_usb(device_t dev);

 static device_method_t fixup_pci_methods[] = {
     /* Device interface */
@@ -84,6 +85,9 @@ fixup_pci_probe(device_t dev)
     case 0x01e010de:		/* nVidia nForce2 */
 	fixc1_nforce2(dev);
 	break;
+    case 0x96001022:		/* AMD SB700 */
+	fixsmi_usb(dev);
+	break;
     }
     return(ENXIO);
 }
@@ -124,6 +128,21 @@
 }


+/* Disable USB SMI */
+static void
+fixsmi_usb(device_t dev)
+{
+    uint32_t		features;
+
+    dev = pci_find_device(0x1002, 0x4385);
+    features = pci_read_config(dev, 0x64, 4);
+    if (features & (1 << 15)) {
+	printf("Disabling USB SMI on SB7xx\n");
+	features &= ~(1 << 15);
+	pci_write_config(dev, 0x64, features, 4);
+    }
+}
+
 /*
  * Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
  * around a hang that is triggered when the CPU generates a very fast

-- 
Andriy Gapon