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71fbad6c9a
This patch reduces power consumption by allowing idle devices to go to a low power state after another device on the same power resource has been awakened. A power resource may be shared by multiple devices. When all devices sharing a power resource are put into D3_COLD state, the power resource will be turned off. When one of the devices is awakened, the power resource will be turned on and all devices sharing it will be powered on to D0uninitialized state. These devices should be resumed, so that they have the opportunity to go to low power state later. [bhelgaas: changelog] Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/acpi.h>
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#include <linux/pm_runtime.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_bind");
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static int acpi_pci_unbind(struct acpi_device *device)
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{
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struct pci_dev *dev;
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dev = acpi_get_pci_dev(device->handle);
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if (!dev)
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goto out;
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device_set_run_wake(&dev->dev, false);
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pci_acpi_remove_pm_notifier(device);
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acpi_power_resource_unregister_device(&dev->dev, device->handle);
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if (!dev->subordinate)
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goto out;
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acpi_pci_irq_del_prt(dev->subordinate);
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device->ops.bind = NULL;
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device->ops.unbind = NULL;
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out:
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pci_dev_put(dev);
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return 0;
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}
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static int acpi_pci_bind(struct acpi_device *device)
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{
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acpi_status status;
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acpi_handle handle;
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struct pci_bus *bus;
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struct pci_dev *dev;
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dev = acpi_get_pci_dev(device->handle);
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if (!dev)
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return 0;
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pci_acpi_add_pm_notifier(device, dev);
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acpi_power_resource_register_device(&dev->dev, device->handle);
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if (device->wakeup.flags.run_wake)
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device_set_run_wake(&dev->dev, true);
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/*
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* Install the 'bind' function to facilitate callbacks for
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* children of the P2P bridge.
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*/
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if (dev->subordinate) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device %04x:%02x:%02x.%d is a PCI bridge\n",
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pci_domain_nr(dev->bus), dev->bus->number,
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PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
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device->ops.bind = acpi_pci_bind;
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device->ops.unbind = acpi_pci_unbind;
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}
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/*
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* Evaluate and parse _PRT, if exists. This code allows parsing of
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* _PRT objects within the scope of non-bridge devices. Note that
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* _PRTs within the scope of a PCI bridge assume the bridge's
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* subordinate bus number.
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*
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* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
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*/
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status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
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if (ACPI_FAILURE(status))
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goto out;
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if (dev->subordinate)
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bus = dev->subordinate;
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else
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bus = dev->bus;
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acpi_pci_irq_add_prt(device->handle, bus);
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out:
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pci_dev_put(dev);
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return 0;
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}
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int acpi_pci_bind_root(struct acpi_device *device)
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{
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device->ops.bind = acpi_pci_bind;
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device->ops.unbind = acpi_pci_unbind;
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return 0;
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}
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