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 _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"