agp/amd-k7: Convert to generic power management

Convert agpgart-amdk7 from legacy PCI power management to the generic power
management framework.

Previously agpgart-amdk7 used legacy PCI power management, and
agp_amdk7_suspend() and agp_amdk7_resume() were responsible for both
device-specific things and generic PCI things like saving and restoring
config space and managing power state:

  agp_amdk7_suspend
    pci_save_state                         <-- generic PCI
    pci_set_power_state                    <-- generic PCI

  agp_amdk7_resume
    pci_set_power_state(PCI_D0)            <-- generic PCI
    pci_restore_state                      <-- generic PCI
    amd_irongate_driver.configure          <-- device-specific

Convert to generic power management where the PCI bus PM methods do the
generic PCI things, and the driver needs only the device-specific part,
i.e.,

  suspend_devices_and_enter
    dpm_suspend_start(PMSG_SUSPEND)
      pci_pm_suspend                       # PCI bus .suspend() method
        agp_amdk7_suspend                  <-- not needed at all; removed
    suspend_enter
      dpm_suspend_noirq(PMSG_SUSPEND)
        pci_pm_suspend_noirq               # PCI bus .suspend_noirq() method
          pci_save_state                   <-- generic PCI
          pci_prepare_to_sleep             <-- generic PCI
            pci_set_power_state
    ...
    dpm_resume_end(PMSG_RESUME)
      pci_pm_resume                        # PCI bus .resume() method
        pci_restore_standard_config
          pci_set_power_state(PCI_D0)      <-- generic PCI
          pci_restore_state                <-- generic PCI
        agp_amdk7_resume                   # driver->pm->resume
          amd_irongate_driver.configure    <-- device-specific

Based on 0aeddbd0cb ("via-agp: convert to generic power management") by
Vaibhav Gupta <vaibhavgupta40@gmail.com>.

Link: https://lore.kernel.org/r/20221025203852.681822-4-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Dave Airlie <airlied@redhat.com>

drivers/char/agp/amd-k7-agp.c

@@ -488,26 +488,11 @@ static void agp_amdk7_remove(struct pci_dev *pdev)
 	agp_put_bridge(bridge);
 }
 
-#ifdef CONFIG_PM
-
-static int agp_amdk7_suspend(struct pci_dev *pdev, pm_message_t state)
+static int agp_amdk7_resume(struct device *dev)
 {
-	pci_save_state(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
-	return 0;
-}
-
-static int agp_amdk7_resume(struct pci_dev *pdev)
-{
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-
 	return amd_irongate_driver.configure();
 }
 
-#endif /* CONFIG_PM */
-
 /* must be the same order as name table above */
 static const struct pci_device_id agp_amdk7_pci_table[] = {
 	{
@@ -539,15 +524,14 @@ static const struct pci_device_id agp_amdk7_pci_table[] = {
 
 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
 
+static DEFINE_SIMPLE_DEV_PM_OPS(agp_amdk7_pm_ops, NULL, agp_amdk7_resume);
+
 static struct pci_driver agp_amdk7_pci_driver = {
 	.name		= "agpgart-amdk7",
 	.id_table	= agp_amdk7_pci_table,
 	.probe		= agp_amdk7_probe,
 	.remove		= agp_amdk7_remove,
-#ifdef CONFIG_PM
-	.suspend	= agp_amdk7_suspend,
-	.resume		= agp_amdk7_resume,
-#endif
+	.driver.pm	= &agp_amdk7_pm_ops,
 };
 
 static int __init agp_amdk7_init(void)