acpiphp: Execute ACPI _REG method for hotadded devices
Per ACPI spec, _ERG method should be executed before device driver gets control for hotpluged device. Firmware might do some configuration there. See http://bugzilla.kernel.org/show_bug.cgi?id=10805. In this machine, _REG method of docked device will configure cardbus bridge. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Tested-by: Paul Martin <pm@debian.org> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -749,6 +749,24 @@ static int acpiphp_bus_trim(acpi_handle handle)
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return retval;
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}
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static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
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{
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struct acpiphp_func *func;
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union acpi_object params[2];
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struct acpi_object_list arg_list;
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list_for_each_entry(func, &slot->funcs, sibling) {
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arg_list.count = 2;
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arg_list.pointer = params;
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params[0].type = ACPI_TYPE_INTEGER;
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params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
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params[1].type = ACPI_TYPE_INTEGER;
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params[1].integer.value = 1;
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/* _REG is optional, we don't care about if there is failure */
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acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
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}
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}
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/**
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* enable_device - enable, configure a slot
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* @slot: slot to be enabled
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@ -805,6 +823,7 @@ static int __ref enable_device(struct acpiphp_slot *slot)
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pci_bus_assign_resources(bus);
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acpiphp_sanitize_bus(bus);
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acpiphp_set_hpp_values(bus);
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acpiphp_set_acpi_region(slot);
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pci_enable_bridges(bus);
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pci_bus_add_devices(bus);
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