On Sunday 27 September 2009 9:10:21 am Andriy Gapon wrote:
> 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
I don't think you can do this because it is a "feature" to not disable SMM if
ohci(4) is not loaded so that a USB keyboard works when the USB driver isn't
loaded via PS/2 emulation, even when the OS is running. I am curious if we
really need to do the handover for each controller or if disabling it for
ohci0 effectively disables it for all controllers? What do other OS's do?
--
John Baldwin
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