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From:   Vaibhav Gupta <vaibhavgupta40@gmail.com>
To:     Bjorn Helgaas <helgaas@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Bjorn Helgaas <bjorn@helgaas.com>,
        Vaibhav Gupta <vaibhav.varodek@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Daniele Venzano <venza@brownhat.org>,
        Samuel Chessman <chessman@tux.org>,
        "Michael S. Tsirkin" <mst@redhat.com>
Cc:     Vaibhav Gupta <vaibhavgupta40@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        Shuah Khan <skhan@linuxfoundation.org>
Subject: [PATCH v1 3/3] tlan: use generic power management
Date:   Thu, 30 Jul 2020 12:12:29 +0530
Message-Id: <20200730064229.174933-4-vaibhavgupta40@gmail.com>
In-Reply-To: <20200730064229.174933-1-vaibhavgupta40@gmail.com>
References: <20200730051733.113652-1-vaibhavgupta40@gmail.com>
 <20200730064229.174933-1-vaibhavgupta40@gmail.com>
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Drivers using legacy power management .suspen()/.resume() callbacks
have to manage PCI states and device's PM states themselves. They also
need to take care of standard configuration registers.

Switch to generic power management framework using a single
"struct dev_pm_ops" variable to take the unnecessary load from the driver.
This also avoids the need for the driver to directly call most of the PCI
helper functions and device power state control functions, as through
the generic framework PCI Core takes care of the necessary operations,
and drivers are required to do only device-specific jobs.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/ti/tlan.c | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/ti/tlan.c b/drivers/net/ethernet/ti/tlan.c
index 857709828058..c799945a39ef 100644
--- a/drivers/net/ethernet/ti/tlan.c
+++ b/drivers/net/ethernet/ti/tlan.c
@@ -345,33 +345,21 @@ static void tlan_stop(struct net_device *dev)
 	}
 }
 
-#ifdef CONFIG_PM
-
-static int tlan_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused tlan_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 
 	if (netif_running(dev))
 		tlan_stop(dev);
 
 	netif_device_detach(dev);
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-	pci_wake_from_d3(pdev, false);
-	pci_set_power_state(pdev, PCI_D3hot);
 
 	return 0;
 }
 
-static int tlan_resume(struct pci_dev *pdev)
+static int __maybe_unused tlan_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
-	int rc = pci_enable_device(pdev);
-
-	if (rc)
-		return rc;
-	pci_restore_state(pdev);
-	pci_enable_wake(pdev, PCI_D0, 0);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	netif_device_attach(dev);
 
 	if (netif_running(dev))
@@ -380,21 +368,14 @@ static int tlan_resume(struct pci_dev *pdev)
 	return 0;
 }
 
-#else /* CONFIG_PM */
-
-#define tlan_suspend   NULL
-#define tlan_resume    NULL
-
-#endif /* CONFIG_PM */
-
+static SIMPLE_DEV_PM_OPS(tlan_pm_ops, tlan_suspend, tlan_resume);
 
 static struct pci_driver tlan_driver = {
 	.name		= "tlan",
 	.id_table	= tlan_pci_tbl,
 	.probe		= tlan_init_one,
 	.remove		= tlan_remove_one,
-	.suspend	= tlan_suspend,
-	.resume		= tlan_resume,
+	.driver.pm	= &tlan_pm_ops,
 };
 
 static int __init tlan_probe(void)
-- 
2.27.0