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Merge branch 'pci/pm' into next 

* pci/pm:
  PCI: Avoid unnecessary resume after direct-complete
  PCI: Recognize D3cold in pci_update_current_state()
  PCI: Query platform firmware for device power state
  PCI: Afford direct-complete to devices with non-standard PM
hifive-unleashed-5.1
Bjorn Helgaas 2016-10-03 09:43:21 -05:00
parent 6c6cba4949 a0d2a959d3
commit 3f4f35678f
4 changed files with 73 additions and 19 deletions
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22
drivers/pci/pci-acpi.c
View File

@ -452,6 +452,27 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
return error;
}
static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
static const pci_power_t state_conv[] = {
[ACPI_STATE_D0] = PCI_D0,
[ACPI_STATE_D1] = PCI_D1,
[ACPI_STATE_D2] = PCI_D2,
[ACPI_STATE_D3_HOT] = PCI_D3hot,
[ACPI_STATE_D3_COLD] = PCI_D3cold,
};
int state;
if (!adev || !acpi_device_power_manageable(adev))
return PCI_UNKNOWN;
if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN)
return PCI_UNKNOWN;
return state_conv[state];
}
static bool acpi_pci_can_wakeup(struct pci_dev *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
@ -534,6 +555,7 @@ static bool acpi_pci_need_resume(struct pci_dev *dev)
static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
.is_manageable = acpi_pci_power_manageable,
.set_state = acpi_pci_set_power_state,
.get_state = acpi_pci_get_power_state,
.choose_state = acpi_pci_choose_state,
.sleep_wake = acpi_pci_sleep_wake,
.run_wake = acpi_pci_run_wake,

15
drivers/pci/pci-driver.c
View File

@ -682,8 +682,19 @@ static int pci_pm_prepare(struct device *dev)
static void pci_pm_complete(struct device *dev)
{
pci_dev_complete_resume(to_pci_dev(dev));
pm_complete_with_resume_check(dev);
struct pci_dev *pci_dev = to_pci_dev(dev);
pci_dev_complete_resume(pci_dev);
pm_generic_complete(dev);
/* Resume device if platform firmware has put it in reset-power-on */
if (dev->power.direct_complete && pm_resume_via_firmware()) {
pci_power_t pre_sleep_state = pci_dev->current_state;
pci_update_current_state(pci_dev, pci_dev->current_state);
if (pci_dev->current_state < pre_sleep_state)
pm_request_resume(dev);
}
}
#else /* !CONFIG_PM_SLEEP */

52
drivers/pci/pci.c
View File

@ -552,8 +552,9 @@ static const struct pci_platform_pm_ops *pci_platform_pm;
int pci_set_platform_pm(const struct pci_platform_pm_ops *ops)
{
if (!ops->is_manageable || !ops->set_state || !ops->choose_state ||
!ops->sleep_wake || !ops->run_wake || !ops->need_resume)
if (!ops->is_manageable || !ops->set_state || !ops->get_state ||
!ops->choose_state || !ops->sleep_wake || !ops->run_wake ||
!ops->need_resume)
return -EINVAL;
pci_platform_pm = ops;
return 0;
@ -570,6 +571,11 @@ static inline int platform_pci_set_power_state(struct pci_dev *dev,
return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
}
static inline pci_power_t platform_pci_get_power_state(struct pci_dev *dev)
{
return pci_platform_pm ? pci_platform_pm->get_state(dev) : PCI_UNKNOWN;
}
static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
{
return pci_platform_pm ?
@ -701,26 +707,25 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
}
/**
* pci_update_current_state - Read PCI power state of given device from its
* PCI PM registers and cache it
* pci_update_current_state - Read power state of given device and cache it
* @dev: PCI device to handle.
* @state: State to cache in case the device doesn't have the PM capability
*
* The power state is read from the PMCSR register, which however is
* inaccessible in D3cold. The platform firmware is therefore queried first
* to detect accessibility of the register. In case the platform firmware
* reports an incorrect state or the device isn't power manageable by the
* platform at all, we try to detect D3cold by testing accessibility of the
* vendor ID in config space.
*/
void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
{
if (dev->pm_cap) {
if (platform_pci_get_power_state(dev) == PCI_D3cold ||
!pci_device_is_present(dev)) {
dev->current_state = PCI_D3cold;
} else if (dev->pm_cap) {
u16 pmcsr;
/*
* Configuration space is not accessible for device in
* D3cold, so just keep or set D3cold for safety
*/
if (dev->current_state == PCI_D3cold)
return;
if (state == PCI_D3cold) {
dev->current_state = PCI_D3cold;
return;
}
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
} else {
@ -1959,9 +1964,22 @@ static pci_power_t pci_target_state(struct pci_dev *dev)
default:
target_state = state;
}
} else if (!dev->pm_cap) {
return target_state;
}
if (!dev->pm_cap)
target_state = PCI_D0;
} else if (device_may_wakeup(&dev->dev)) {
/*
* If the device is in D3cold even though it's not power-manageable by
* the platform, it may have been powered down by non-standard means.
* Best to let it slumber.
*/
if (dev->current_state == PCI_D3cold)
target_state = PCI_D3cold;
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

3
drivers/pci/pci.h
View File

@ -42,6 +42,8 @@ int pci_probe_reset_function(struct pci_dev *dev);
*
* @set_state: invokes the platform firmware to set the device's power state
*
* @get_state: queries the platform firmware for a device's current power state
*
* @choose_state: returns PCI power state of given device preferred by the
* platform; to be used during system-wide transitions from a
* sleeping state to the working state and vice versa
@ -62,6 +64,7 @@ int pci_probe_reset_function(struct pci_dev *dev);
struct pci_platform_pm_ops {
bool (*is_manageable)(struct pci_dev *dev);
int (*set_state)(struct pci_dev *dev, pci_power_t state);
pci_power_t (*get_state)(struct pci_dev *dev);
pci_power_t (*choose_state)(struct pci_dev *dev);
int (*sleep_wake)(struct pci_dev *dev, bool enable);
int (*run_wake)(struct pci_dev *dev, bool enable);