diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 114 |
1 files changed, 105 insertions, 9 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 9eae64b17954..8effb9b23eec 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -622,7 +622,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) dev_info(&dev->dev, "Refused to change power state, " "currently in D%d\n", dev->current_state); - /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT + /* + * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning * from D3hot to D0 _may_ perform an internal reset, thereby * going to "D0 Uninitialized" rather than "D0 Initialized". @@ -654,6 +655,16 @@ void pci_update_current_state(struct pci_dev *dev, pci_power_t state) 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 { @@ -694,8 +705,50 @@ static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) */ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) { - if (state == PCI_D0) + if (state == PCI_D0) { pci_platform_power_transition(dev, PCI_D0); + /* + * Mandatory power management transition delays, see + * PCI Express Base Specification Revision 2.0 Section + * 6.6.1: Conventional Reset. Do not delay for + * devices powered on/off by corresponding bridge, + * because have already delayed for the bridge. + */ + if (dev->runtime_d3cold) { + msleep(dev->d3cold_delay); + /* + * When powering on a bridge from D3cold, the + * whole hierarchy may be powered on into + * D0uninitialized state, resume them to give + * them a chance to suspend again + */ + pci_wakeup_bus(dev->subordinate); + } + } +} + +/** + * __pci_dev_set_current_state - Set current state of a PCI device + * @dev: Device to handle + * @data: pointer to state to be set + */ +static int __pci_dev_set_current_state(struct pci_dev *dev, void *data) +{ + pci_power_t state = *(pci_power_t *)data; + + dev->current_state = state; + return 0; +} + +/** + * __pci_bus_set_current_state - Walk given bus and set current state of devices + * @bus: Top bus of the subtree to walk. + * @state: state to be set + */ +static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state) +{ + if (bus) + pci_walk_bus(bus, __pci_dev_set_current_state, &state); } /** @@ -707,8 +760,15 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) */ int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) { - return state >= PCI_D0 ? - pci_platform_power_transition(dev, state) : -EINVAL; + int ret; + + if (state < PCI_D0) + return -EINVAL; + ret = pci_platform_power_transition(dev, state); + /* Power off the bridge may power off the whole hierarchy */ + if (!ret && state == PCI_D3cold) + __pci_bus_set_current_state(dev->subordinate, PCI_D3cold); + return ret; } EXPORT_SYMBOL_GPL(__pci_complete_power_transition); @@ -732,8 +792,8 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state) int error; /* bound the state we're entering */ - if (state > PCI_D3hot) - state = PCI_D3hot; + if (state > PCI_D3cold) + state = PCI_D3cold; else if (state < PCI_D0) state = PCI_D0; else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) @@ -748,10 +808,15 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state) /* This device is quirked not to be put into D3, so don't put it in D3 */ - if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) + if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) return 0; - error = pci_raw_set_power_state(dev, state); + /* + * To put device in D3cold, we put device into D3hot in native + * way, then put device into D3cold with platform ops + */ + error = pci_raw_set_power_state(dev, state > PCI_D3hot ? + PCI_D3hot : state); if (!__pci_complete_power_transition(dev, state)) error = 0; @@ -1498,6 +1563,28 @@ void pci_pme_wakeup_bus(struct pci_bus *bus) } /** + * pci_wakeup - Wake up a PCI device + * @dev: Device to handle. + * @ign: ignored parameter + */ +static int pci_wakeup(struct pci_dev *pci_dev, void *ign) +{ + pci_wakeup_event(pci_dev); + pm_request_resume(&pci_dev->dev); + return 0; +} + +/** + * pci_wakeup_bus - Walk given bus and wake up devices on it + * @bus: Top bus of the subtree to walk. + */ +void pci_wakeup_bus(struct pci_bus *bus) +{ + if (bus) + pci_walk_bus(bus, pci_wakeup, NULL); +} + +/** * pci_pme_capable - check the capability of PCI device to generate PME# * @dev: PCI device to handle. * @state: PCI state from which device will issue PME#. @@ -1754,6 +1841,10 @@ int pci_prepare_to_sleep(struct pci_dev *dev) if (target_state == PCI_POWER_ERROR) return -EIO; + /* D3cold during system suspend/hibernate is not supported */ + if (target_state > PCI_D3hot) + target_state = PCI_D3hot; + pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); error = pci_set_power_state(dev, target_state); @@ -1791,12 +1882,16 @@ int pci_finish_runtime_suspend(struct pci_dev *dev) if (target_state == PCI_POWER_ERROR) return -EIO; + dev->runtime_d3cold = target_state == PCI_D3cold; + __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); error = pci_set_power_state(dev, target_state); - if (error) + if (error) { __pci_enable_wake(dev, target_state, true, false); + dev->runtime_d3cold = false; + } return error; } @@ -1866,6 +1961,7 @@ void pci_pm_init(struct pci_dev *dev) dev->pm_cap = pm; dev->d3_delay = PCI_PM_D3_WAIT; + dev->d3cold_delay = PCI_PM_D3COLD_WAIT; dev->d1_support = false; dev->d2_support = false; |