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

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Message-Id: <20211201025419.2797624-4-helgaas@kernel.org>
Date:   Tue, 30 Nov 2021 20:54:19 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     David Airlie <airlied@...ux.ie>
Cc:     Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Vaibhav Gupta <vaibhavgupta40@...il.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 3/3] via-agp: convert to generic power management

From: Vaibhav Gupta <vaibhavgupta40@...il.com>

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@...il.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 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