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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>
This commit is contained in:
Shaohua Li 2010-02-25 10:59:34 +08:00 committed by Len Brown
parent 60b341b778
commit d060705091
1 changed files with 19 additions and 0 deletions
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19
drivers/pci/hotplug/acpiphp_glue.c
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@ -749,6 +749,24 @@ static int acpiphp_bus_trim(acpi_handle handle)
return retval;
}
static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
{
struct acpiphp_func *func;
union acpi_object params[2];
struct acpi_object_list arg_list;
list_for_each_entry(func, &slot->funcs, sibling) {
arg_list.count = 2;
arg_list.pointer = params;
params[0].type = ACPI_TYPE_INTEGER;
params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 1;
/* _REG is optional, we don't care about if there is failure */
acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
}
}
/**
* enable_device - enable, configure a slot
* @slot: slot to be enabled
@ -805,6 +823,7 @@ static int __ref enable_device(struct acpiphp_slot *slot)
pci_bus_assign_resources(bus);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(bus);
acpiphp_set_acpi_region(slot);
pci_enable_bridges(bus);
pci_bus_add_devices(bus);