At the time of this writing there are two ways to define power management
callbacks for a PCI device driver, the recommended one, based on using a
dev_pm_ops structure described in Documentation/driver-api/pm/devices.rst, and
-the "legacy" one, in which the .suspend(), .suspend_late(), .resume_early(), and
+the "legacy" one, in which the .suspend(), .suspend_late(), and
.resume() callbacks from struct pci_driver are used. The legacy approach,
however, doesn't allow one to define runtime power management callbacks and is
not really suitable for any new drivers. Therefore it is not covered by this
return 0;
}
-static int pci_legacy_resume_early(struct device *dev)
-{
- struct pci_dev *pci_dev = to_pci_dev(dev);
- struct pci_driver *drv = pci_dev->driver;
-
- return drv && drv->resume_early ?
- drv->resume_early(pci_dev) : 0;
-}
-
static int pci_legacy_resume(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
{
struct pci_driver *drv = pci_dev->driver;
- bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
- || drv->resume_early);
+ bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume);
/*
* Legacy PM support is used by default, so warn if the new framework is
pcie_pme_root_status_cleanup(pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
- return pci_legacy_resume_early(dev);
+ return 0;
if (pm && pm->resume_noirq)
return pm->resume_noirq(dev);
}
/*
- * Both the legacy ->resume_early() and the new pm->thaw_noirq()
- * callbacks assume the device has been returned to D0 and its
- * config state has been restored.
+ * The pm->thaw_noirq() callback assumes the device has been
+ * returned to D0 and its config state has been restored.
*
* In addition, pci_restore_state() restores MSI-X state in MMIO
* space, which requires the device to be in D0, so return it to D0
pci_restore_state(pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
- return pci_legacy_resume_early(dev);
+ return 0;
if (pm && pm->thaw_noirq)
return pm->thaw_noirq(dev);
pci_fixup_device(pci_fixup_resume_early, pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
- return pci_legacy_resume_early(dev);
+ return 0;
if (pm && pm->restore_noirq)
return pm->restore_noirq(dev);
* context, so it can sleep.
* @suspend: Put device into low power state.
* @suspend_late: Put device into low power state.
- * @resume_early: Wake device from low power state.
* @resume: Wake device from low power state.
* (Please see Documentation/power/pci.rst for descriptions
* of PCI Power Management and the related functions.)
void (*remove)(struct pci_dev *dev); /* Device removed (NULL if not a hot-plug capable driver) */
int (*suspend)(struct pci_dev *dev, pm_message_t state); /* Device suspended */
int (*suspend_late)(struct pci_dev *dev, pm_message_t state);
- int (*resume_early)(struct pci_dev *dev);
int (*resume)(struct pci_dev *dev); /* Device woken up */
void (*shutdown)(struct pci_dev *dev);
int (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */