diff options
| -rw-r--r-- | drivers/pci/pci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 2472e7177b4..44d1c7c3876 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2479,6 +2479,21 @@ clear: return 0; } +/** + * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0. + * @dev: Device to reset. + * @probe: If set, only check if the device can be reset this way. + * + * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is + * unset, it will be reinitialized internally when going from PCI_D3hot to + * PCI_D0. If that's the case and the device is not in a low-power state + * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset. + * + * NOTE: This causes the caller to sleep for twice the device power transition + * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms + * by devault (i.e. unless the @dev's d3_delay field has a different value). + * Moreover, only devices in D0 can be reset by this function. + */ static int pci_pm_reset(struct pci_dev *dev, int probe) { u16 csr; |