PCI ACPI: Rework PCI handling of wake-up
* Introduce function acpi_pm_device_sleep_wake() for enabling and
disabling the system wake-up capability of devices that are power
manageable by ACPI.
* Introduce function acpi_bus_can_wakeup() allowing other (dependent)
subsystems to check if ACPI is able to enable the system wake-up
capability of given device.
* Introduce callback .sleep_wake() in struct pci_platform_pm_ops and
for the ACPI PCI 'driver' make it use acpi_pm_device_sleep_wake().
* Introduce callback .can_wakeup() in struct pci_platform_pm_ops and
for the ACPI 'driver' make it use acpi_bus_can_wakeup().
* Move the PME# handlig code out of pci_enable_wake() and split it
into two functions, pci_pme_capable() and pci_pme_active(),
allowing the caller to check if given device is capable of
generating PME# from given power state and to enable/disable the
device's PME# functionality, respectively.
* Modify pci_enable_wake() to use the new ACPI callbacks and the new
PME#-related functions.
* Drop the generic .platform_enable_wakeup() callback that is not
used any more.
* Introduce device_set_wakeup_capable() that will set the
power.can_wakeup flag of given device.
* Rework PCI device PM initialization so that, if given device is
capable of generating wake-up events, either natively through the
PME# mechanism, or with the help of the platform, its
power.can_wakeup flag is set and its power.should_wakeup flag is
unset as appropriate.
* Make ACPI set the power.can_wakeup flag for devices found to be
wake-up capable by it.
* Make the ACPI wake-up code enable/disable GPEs for devices that
have the wakeup.flags.prepared flag set (which means that their
wake-up power has been enabled).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2f0ae70..b1724cf 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -860,49 +860,6 @@
return PCI_CFG_SPACE_SIZE;
}
-/**
- * pci_disable_pme - Disable the PME function of PCI device
- * @dev: PCI device affected
- * -EINVAL is returned if PCI device doesn't support PME.
- * Zero is returned if the PME is supported and can be disabled.
- */
-static int pci_disable_pme(struct pci_dev *dev)
-{
- int pm;
- u16 value;
-
- /* find PCI PM capability in list */
- pm = pci_find_capability(dev, PCI_CAP_ID_PM);
-
- /* If device doesn't support PM Capabilities, it means that PME is
- * not supported.
- */
- if (!pm)
- return -EINVAL;
- /* Check device's ability to generate PME# */
- pci_read_config_word(dev, pm + PCI_PM_PMC, &value);
-
- value &= PCI_PM_CAP_PME_MASK;
- /* Check if it can generate PME# */
- if (!value) {
- /*
- * If it is zero, it means that PME is still unsupported
- * although there exists the PM capability.
- */
- return -EINVAL;
- }
-
- pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
-
- /* Clear PME_Status by writing 1 to it */
- value |= PCI_PM_CTRL_PME_STATUS ;
- /* Disable PME enable bit */
- value &= ~PCI_PM_CTRL_PME_ENABLE;
- pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
-
- return 0;
-}
-
int pci_cfg_space_size(struct pci_dev *dev)
{
int pos;
@@ -1010,7 +967,6 @@
}
pci_vpd_pci22_init(dev);
- pci_disable_pme(dev);
return dev;
}
@@ -1031,6 +987,9 @@
/* Fix up broken headers */
pci_fixup_device(pci_fixup_header, dev);
+ /* Initialize power management of the device */
+ pci_pm_init(dev);
+
/*
* Add the device to our list of discovered devices
* and the bus list for fixup functions, etc.