diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 49 |
1 files changed, 28 insertions, 21 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index bc4af86da3f9..a5b93f85377a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1192,23 +1192,24 @@ static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout) */ int pci_power_up(struct pci_dev *dev) { - bool need_restore = false; + bool need_restore; + pci_power_t state; u16 pmcsr; - int ret; - ret = platform_pci_set_power_state(dev, PCI_D0); - if (!ret) { - pci_update_current_state(dev, PCI_D0); - } else if (!dev->pm_cap) { /* Fall back to PCI_D0 */ - dev->current_state = PCI_D0; - return 0; - } + platform_pci_set_power_state(dev, PCI_D0); - if (dev->current_state == PCI_D0) - return 0; + if (!dev->pm_cap) { + state = platform_pci_get_power_state(dev); + if (state == PCI_UNKNOWN) + dev->current_state = PCI_D0; + else + dev->current_state = state; + + if (state == PCI_D0) + return 0; - if (!dev->pm_cap) return -EIO; + } pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); if (PCI_POSSIBLE_ERROR(pmcsr)) { @@ -1218,26 +1219,31 @@ int pci_power_up(struct pci_dev *dev) return -EIO; } + state = pmcsr & PCI_PM_CTRL_STATE_MASK; + + need_restore = (state == PCI_D3hot || dev->current_state >= PCI_D3hot) && + !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET); + + if (state == PCI_D0) { + dev->current_state = PCI_D0; + goto end; + } + /* * If we're (effectively) in D3, force entire word to 0. This doesn't * affect PME_Status, disables PME_En, and sets PowerState to 0. */ - if (dev->current_state >= PCI_D3hot) { - if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot && - !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) - need_restore = true; - + if (state == PCI_D3hot) pmcsr = 0; - } else { + else pmcsr &= ~PCI_PM_CTRL_STATE_MASK; - } pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); /* Mandatory transition delays; see PCI PM 1.2. */ - if (dev->current_state == PCI_D3hot) + if (state == PCI_D3hot) pci_dev_d3_sleep(dev); - else if (dev->current_state == PCI_D2) + else if (state == PCI_D2) udelay(PCI_PM_D2_DELAY); pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); @@ -1246,6 +1252,7 @@ int pci_power_up(struct pci_dev *dev) pci_info_ratelimited(dev, "Refused to change power state from %s to D0\n", pci_power_name(dev->current_state)); +end: /* * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning |