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PCI PM: make more PCI PM core functionality available to drivers

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Make more PCI PM core functionality available to drivers

* Export pci_pme_capable() so that it can be called directly by
  drivers (for example, tg3 needs that).

* Move the state choosing part of pci_prepare_to_sleep() to a
  separate function, pci_target_state(), that can be called directly
  by drivers (for example, tg3 needs that).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki 2008-07-19 14:39:24 +02:00 committed by Jesse Barnes
parent f42e86d95f
commit e5899e1b7d
2 changed files with 26 additions and 10 deletions
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34
drivers/pci/pci.c
View File

@ -1040,7 +1040,7 @@ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
* @dev: PCI device to handle.
* @state: PCI state from which device will issue PME#.
*/
static bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
{
if (!dev->pm_cap)
return false;
@ -1123,17 +1123,10 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
}
/**
* pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
* @dev: Device to handle.
*
* Choose the power state appropriate for the device depending on whether
* it can wake up the system and/or is power manageable by the platform
* (PCI_D3hot is the default) and put the device into that state.
*/
int pci_prepare_to_sleep(struct pci_dev *dev)
pci_power_t pci_target_state(struct pci_dev *dev)
{
pci_power_t target_state = PCI_D3hot;
int error;
if (platform_pci_power_manageable(dev)) {
/*
@ -1160,7 +1153,7 @@ int pci_prepare_to_sleep(struct pci_dev *dev)
* to generate PME#.
*/
if (!dev->pm_cap)
return -EIO;
return PCI_POWER_ERROR;
if (dev->pme_support) {
while (target_state
@ -1169,6 +1162,25 @@ int pci_prepare_to_sleep(struct pci_dev *dev)
}
}
return target_state;
}
/**
* pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
* @dev: Device to handle.
*
* Choose the power state appropriate for the device depending on whether
* it can wake up the system and/or is power manageable by the platform
* (PCI_D3hot is the default) and put the device into that state.
*/
int pci_prepare_to_sleep(struct pci_dev *dev)
{
pci_power_t target_state = pci_target_state(dev);
int error;
if (target_state == PCI_POWER_ERROR)
return -EIO;
pci_enable_wake(dev, target_state, true);
error = pci_set_power_state(dev, target_state);
@ -1918,7 +1930,9 @@ EXPORT_SYMBOL(pci_select_bars);
EXPORT_SYMBOL(pci_set_power_state);
EXPORT_SYMBOL(pci_save_state);
EXPORT_SYMBOL(pci_restore_state);
EXPORT_SYMBOL(pci_pme_capable);
EXPORT_SYMBOL(pci_enable_wake);
EXPORT_SYMBOL(pci_target_state);
EXPORT_SYMBOL(pci_prepare_to_sleep);
EXPORT_SYMBOL(pci_back_from_sleep);
EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);

2
include/linux/pci.h
View File

@ -638,7 +638,9 @@ int pci_save_state(struct pci_dev *dev);
int pci_restore_state(struct pci_dev *dev);
int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state);
int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable);
pci_power_t pci_target_state(struct pci_dev *dev);
int pci_prepare_to_sleep(struct pci_dev *dev);
int pci_back_from_sleep(struct pci_dev *dev);