ksz884x: use generic power management

With legacy PM, drivers themselves were responsible for managing the
device's power states and takes care of register states.

After upgrading to the generic structure, PCI core will take care of
required tasks and drivers should do only device-specific operations.

Thus, there is no need to call the PCI helper functions like
pci_enable_wake(), pci_save/restore_sate() and
pci_set_power_state().

Compile-tested only.
Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/micrel/ksz884x.c

@@ -7155,17 +7155,14 @@ static void pcidev_exit(struct pci_dev *pdev)
 	kfree(info);
 }
 
-#ifdef CONFIG_PM
-static int pcidev_resume(struct pci_dev *pdev)
+static int __maybe_unused pcidev_resume(struct device *dev_d)
 {
 	int i;
-	struct platform_info *info = pci_get_drvdata(pdev);
+	struct platform_info *info = dev_get_drvdata(dev_d);
 	struct dev_info *hw_priv = &info->dev_info;
 	struct ksz_hw *hw = &hw_priv->hw;
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	pci_enable_wake(pdev, PCI_D0, 0);
+	device_wakeup_disable(dev_d);
 
 	if (hw_priv->wol_enable)
 		hw_cfg_wol_pme(hw, 0);
@@ -7182,10 +7179,10 @@ static int pcidev_resume(struct pci_dev *pdev)
 	return 0;
 }
 
-static int pcidev_suspend(struct pci_dev *pdev, pm_message_t state)
+static int pcidev_suspend(struct device *dev_d)
 {
 	int i;
-	struct platform_info *info = pci_get_drvdata(pdev);
+	struct platform_info *info = dev_get_drvdata(dev_d);
 	struct dev_info *hw_priv = &info->dev_info;
 	struct ksz_hw *hw = &hw_priv->hw;
 
@@ -7207,12 +7204,9 @@ static int pcidev_suspend(struct pci_dev *pdev, pm_message_t state)
 		hw_cfg_wol_pme(hw, 1);
 	}
 
-	pci_save_state(pdev);
-	pci_enable_wake(pdev, pci_choose_state(pdev, state), 1);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	device_wakeup_enable(dev_d);
 	return 0;
 }
-#endif
 
 static char pcidev_name[] = "ksz884xp";
 
@@ -7226,11 +7220,10 @@ static const struct pci_device_id pcidev_table[] = {
 
 MODULE_DEVICE_TABLE(pci, pcidev_table);
 
+static SIMPLE_DEV_PM_OPS(pcidev_pm_ops, pcidev_suspend, pcidev_resume);
+
 static struct pci_driver pci_device_driver = {
-#ifdef CONFIG_PM
-	.suspend	= pcidev_suspend,
-	.resume		= pcidev_resume,
-#endif
+	.driver.pm	= &pcidev_pm_ops,
 	.name		= pcidev_name,
 	.id_table	= pcidev_table,
 	.probe		= pcidev_init,