diff options
author | Rafael J. Wysocki <rjw@sisk.pl> | 2008-07-07 05:35:26 +0400 |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-07-08 03:26:33 +0400 |
commit | 404cc2d8ce41ed4031958fba8e633767e8a2e028 (patch) | |
tree | d679e1ea92d6ae8e72309c02197fd5f1480651fb /drivers/pci | |
parent | eb9d0fe40e313c0a74115ef456a2e43a6c8da72f (diff) | |
download | linux-404cc2d8ce41ed4031958fba8e633767e8a2e028.tar.xz |
PCI PM: Introduce pci_prepare_to_sleep and pci_back_from_sleep
Introduce functions pci_prepare_to_sleep() and pci_back_from_sleep(),
to be used by the PCI drivers that want to place their devices into
the lowest power state appropiate for them (PCI_D3hot, if the device
is not supposed to wake up the system, or the deepest state from
which the wake-up is possible, otherwise) while the system is being
prepared to go into a sleeping state and to put them back into D0
during the subsequent transition to the working state.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/pci.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index a6b1b6f96abc..1b0ec45e9934 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1147,6 +1147,87 @@ 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 target_state = PCI_D3hot; + int pm = pci_find_capability(dev, PCI_CAP_ID_PM); + int error; + + if (platform_pci_power_manageable(dev)) { + /* + * Call the platform to choose the target state of the device + * and enable wake-up from this state if supported. + */ + pci_power_t state = platform_pci_choose_state(dev); + + switch (state) { + case PCI_POWER_ERROR: + case PCI_UNKNOWN: + break; + case PCI_D1: + case PCI_D2: + if (pci_no_d1d2(dev)) + break; + default: + target_state = state; + pci_enable_wake(dev, target_state, true); + } + } else if (device_may_wakeup(&dev->dev)) { + /* + * Find the deepest state from which the device can generate + * wake-up events, make it the target state and enable device + * to generate PME#. + */ + u16 pmc; + + if (!pm) + return -EIO; + + pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); + if (pmc & PCI_PM_CAP_PME_MASK) { + if (!(pmc & PCI_PM_CAP_PME_D3)) { + /* Device cannot generate PME# from D3_hot */ + if (pmc & PCI_PM_CAP_PME_D2) + target_state = PCI_D2; + else if (pmc & PCI_PM_CAP_PME_D1) + target_state = PCI_D1; + else + target_state = PCI_D0; + } + pci_pme_active(dev, pm, true); + } + } + + error = pci_set_power_state(dev, target_state); + + if (error) + pci_enable_wake(dev, target_state, false); + + return error; +} + +/** + * pci_back_from_sleep - turn PCI device on during system-wide transition into + * the working state a sleep state + * @dev: Device to handle. + * + * Disable device's sytem wake-up capability and put it into D0. + */ +int pci_back_from_sleep(struct pci_dev *dev) +{ + pci_enable_wake(dev, PCI_D0, false); + return pci_set_power_state(dev, PCI_D0); +} + +/** * pci_pm_init - Initialize PM functions of given PCI device * @dev: PCI device to handle. */ @@ -1853,5 +1934,7 @@ EXPORT_SYMBOL(pci_set_power_state); EXPORT_SYMBOL(pci_save_state); EXPORT_SYMBOL(pci_restore_state); EXPORT_SYMBOL(pci_enable_wake); +EXPORT_SYMBOL(pci_prepare_to_sleep); +EXPORT_SYMBOL(pci_back_from_sleep); EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |