[Linux-kernel-mentees] [PATCH v1 2/2] smsc9420: use generic power management

From: Vaibhav Gupta <vaibhavgupta40@gmail.com>
To: Bjorn Helgaas <helgaas@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	bjorn@helgaas.com, Vaibhav Gupta <vaibhav.varodek@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Steve Glendinning <steve.glendinning@shawell.net>
Cc: netdev@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-kernel@vger.kernel.org,
	Vaibhav Gupta <vaibhavgupta40@gmail.com>
Subject: [Linux-kernel-mentees] [PATCH v1 2/2] smsc9420: use generic power management
Date: Thu,  2 Jul 2020 16:23:51 +0530	[thread overview]
Message-ID: <20200702105351.363880-3-vaibhavgupta40@gmail.com> (raw)
In-Reply-To: <20200702105351.363880-1-vaibhavgupta40@gmail.com>

Drivers should not use legacy power management as they have to manage power
states and related operations, for the device, themselves. This driver was
handling them with the help of PCI helper functions.

With generic PM, all essentials will be handled by the PCI core. Driver
needs to do only device-specific operations.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/smsc/smsc9420.c | 39 +++++++---------------------
 1 file changed, 10 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smsc9420.c b/drivers/net/ethernet/smsc/smsc9420.c
index 7312e522c022..d07f509cb4c7 100644
--- a/drivers/net/ethernet/smsc/smsc9420.c
+++ b/drivers/net/ethernet/smsc/smsc9420.c
@@ -1422,11 +1422,9 @@ static int smsc9420_open(struct net_device *dev)
 	return result;
 }
 
-#ifdef CONFIG_PM
-
-static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused smsc9420_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct smsc9420_pdata *pd = netdev_priv(dev);
 	u32 int_cfg;
 	ulong flags;
@@ -1451,33 +1449,19 @@ static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
 		netif_device_detach(dev);
 	}
 
-	pci_save_state(pdev);
-	pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	device_wakeup_disable(dev_d);
 
 	return 0;
 }
 
-static int smsc9420_resume(struct pci_dev *pdev)
+static int __maybe_unused smsc9420_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
-	struct smsc9420_pdata *pd = netdev_priv(dev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	int err;
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-
-	err = pci_enable_device(pdev);
-	if (err)
-		return err;
+	pci_set_master(to_pci_dev(dev_d));
 
-	pci_set_master(pdev);
-
-	err = pci_enable_wake(pdev, PCI_D0, 0);
-	if (err)
-		netif_warn(pd, ifup, pd->dev, "pci_enable_wake failed: %d\n",
-			   err);
+	device_wakeup_disable(dev_d);
 
 	if (netif_running(dev)) {
 		/* FIXME: gross. It looks like ancient PM relic.*/
@@ -1487,8 +1471,6 @@ static int smsc9420_resume(struct pci_dev *pdev)
 	return err;
 }
 
-#endif /* CONFIG_PM */
-
 static const struct net_device_ops smsc9420_netdev_ops = {
 	.ndo_open		= smsc9420_open,
 	.ndo_stop		= smsc9420_stop,
@@ -1658,15 +1640,14 @@ static void smsc9420_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static SIMPLE_DEV_PM_OPS(smsc9420_pm_ops, smsc9420_suspend, smsc9420_resume);
+
 static struct pci_driver smsc9420_driver = {
 	.name = DRV_NAME,
 	.id_table = smsc9420_id_table,
 	.probe = smsc9420_probe,
 	.remove = smsc9420_remove,
-#ifdef CONFIG_PM
-	.suspend = smsc9420_suspend,
-	.resume = smsc9420_resume,
-#endif /* CONFIG_PM */
+	.driver.pm = &smsc9420_pm_ops,
 };
 
 static int __init smsc9420_init_module(void)
-- 
2.27.0

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