On Tuesday, August 03, 2010, Kenji Kaneshige wrote:
> (2010/08/03 6:53), Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki<rjw@xxxxxxx>
> >
> > Introduce a function allowing the caller to obtain a mask of _OSC
> > control bits the BIOS will allow the kernel to control for a given
> > PCI root bridge.
> >
> > Signed-off-by: Rafael J. Wysocki<rjw@xxxxxxx>
> > ---
> > drivers/acpi/pci_root.c | 58 ++++++++++++++++++++++++++++++++++++++++--------
> > include/linux/acpi.h | 1
> > 2 files changed, 50 insertions(+), 9 deletions(-)
> >
> > Index: linux-2.6/drivers/acpi/pci_root.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/acpi/pci_root.c
> > +++ linux-2.6/drivers/acpi/pci_root.c
> > @@ -225,21 +225,32 @@ static acpi_status acpi_pci_run_osc(acpi
> > return status;
> > }
> >
> > -static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
> > +static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
> > + u32 support,
> > + u32 *control)
> > {
> > acpi_status status;
> > - u32 support_set, result, capbuf[3];
> > + u32 result, capbuf[3];
> > +
> > + support&= OSC_PCI_SUPPORT_MASKS;
> > + support |= root->osc_support_set;
> >
> > - /* do _OSC query for all possible controls */
> > - support_set = root->osc_support_set | (flags& OSC_PCI_SUPPORT_MASKS);
> > capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
> > - capbuf[OSC_SUPPORT_TYPE] = support_set;
> > - capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
> > + capbuf[OSC_SUPPORT_TYPE] = support;
> > + if (control) {
> > + *control&= OSC_PCI_CONTROL_MASKS;
> > + capbuf[OSC_CONTROL_TYPE] = *control;
>
> I think controls that are already granted to OS need to be ORed here.
> I.e.
>
> capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | *control;
That's correct.
Thanks,
Rafael
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