[PATCH v2 3/3] via-agp: convert to generic power management

From: Bjorn Helgaas
Date: Tue Nov 30 2021 - 21:54:56 EST


From: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>

Convert via-agp from legacy PCI power management to the generic power
management framework.

Previously, via-agp used legacy PCI power management. agp_via_suspend()
looked like this:

agp_via_suspend
pci_save_state(pdev)
pci_set_power_state(pdev, pci_choose_state(pdev, state))

With generic power management, these are both done by the PCI core in
pci_pm_runtime_suspend(), so drop agp_via_suspend() completely.

agp_via_resume() looked like this:

agp_via_resume
pci_set_power_state(pdev, PCI_D0)
pci_restore_state(pdev)
...

With generic power management, the PCI parts are done by
pci_pm_runtime_resume(), so drop those from agp_via_resume().

[bhelgaas: commit log]
Signed-off-by: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/char/agp/via-agp.c | 25 +++++--------------------
1 file changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/char/agp/via-agp.c b/drivers/char/agp/via-agp.c
index 87a92a044570..a460ae352772 100644
--- a/drivers/char/agp/via-agp.c
+++ b/drivers/char/agp/via-agp.c
@@ -492,22 +492,11 @@ static void agp_via_remove(struct pci_dev *pdev)
agp_put_bridge(bridge);
}

-#ifdef CONFIG_PM
+#define agp_via_suspend NULL

-static int agp_via_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused agp_via_resume(struct device *dev)
{
- pci_save_state (pdev);
- pci_set_power_state (pdev, PCI_D3hot);
-
- return 0;
-}
-
-static int agp_via_resume(struct pci_dev *pdev)
-{
- struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
-
- pci_set_power_state (pdev, PCI_D0);
- pci_restore_state(pdev);
+ struct agp_bridge_data *bridge = dev_get_drvdata(dev);

if (bridge->driver == &via_agp3_driver)
return via_configure_agp3();
@@ -517,8 +506,6 @@ static int agp_via_resume(struct pci_dev *pdev)
return 0;
}

-#endif /* CONFIG_PM */
-
/* must be the same order as name table above */
static const struct pci_device_id agp_via_pci_table[] = {
#define ID(x) \
@@ -567,16 +554,14 @@ static const struct pci_device_id agp_via_pci_table[] = {

MODULE_DEVICE_TABLE(pci, agp_via_pci_table);

+static SIMPLE_DEV_PM_OPS(agp_via_pm_ops, agp_via_suspend, agp_via_resume);

static struct pci_driver agp_via_pci_driver = {
.name = "agpgart-via",
.id_table = agp_via_pci_table,
.probe = agp_via_probe,
.remove = agp_via_remove,
-#ifdef CONFIG_PM
- .suspend = agp_via_suspend,
- .resume = agp_via_resume,
-#endif
+ .driver.pm = &agp_via_pm_ops,
};


--
2.25.1