PCI/PM: Use pci_power_up() in pci_set_power_state()

Make it explicitly clear that the code to put devices into D0 in
pci_set_power_state() and in pci_pm_default_resume_early() is the
same by making the latter use pci_power_up() for transitions into D0.

Code rearrangement, no intentional functional impact.

Link: https://lore.kernel.org/r/2520019.OZ1nXS5aSj@kreacher
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>

Author: rafaeljw

drivers/pci/pci.c

@@ -1032,6 +1032,16 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
 	}
 }
 
+/**
+ * pci_power_up - Put the given device into D0
+ * @dev: PCI device to power up
+ */
+int pci_power_up(struct pci_dev *dev)
+{
+	__pci_start_power_transition(dev, PCI_D0);
+	return pci_raw_set_power_state(dev, PCI_D0);
+}
+
 /**
  * __pci_dev_set_current_state - Set current state of a PCI device
  * @dev: Device to handle
@@ -1117,15 +1127,16 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 	if (dev->current_state == state)
 		return 0;
 
+	if (state == PCI_D0)
+		return pci_power_up(dev);
+
 	/*
 	 * 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))
 		return 0;
 
-	__pci_start_power_transition(dev, state);
-
 	/*
 	 * To put device in D3cold, we put device into D3hot in native
 	 * way, then put device into D3cold with platform ops
@@ -1140,16 +1151,6 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 }
 EXPORT_SYMBOL(pci_set_power_state);
 
-/**
- * pci_power_up - Put the given device into D0 forcibly
- * @dev: PCI device to power up
- */
-void pci_power_up(struct pci_dev *dev)
-{
-	__pci_start_power_transition(dev, PCI_D0);
-	pci_raw_set_power_state(dev, PCI_D0);
-}
-
 /**
  * pci_choose_state - Choose the power state of a PCI device
  * @dev: PCI device to be suspended

drivers/pci/pci.h

@@ -85,7 +85,7 @@ struct pci_platform_pm_ops {
 int pci_set_platform_pm(const struct pci_platform_pm_ops *ops);
 void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
 void pci_refresh_power_state(struct pci_dev *dev);
-void pci_power_up(struct pci_dev *dev);
+int pci_power_up(struct pci_dev *dev);
 void pci_disable_enabled_device(struct pci_dev *dev);
 int pci_finish_runtime_suspend(struct pci_dev *dev);
 void pcie_clear_root_pme_status(struct pci_dev *dev);