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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>,
        Don Fry <pcnet32@frontier.com>,
        Tom Lendacky <thomas.lendacky@amd.com>
Cc:     Vaibhav Gupta <vaibhavgupta40@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org
Subject: [RFC PATCH v1 2/3] amd8111e: Convert to generic power mangement
Date:   Tue, 26 May 2020 13:33:23 +0530
Message-Id: <20200526080324.69828-3-vaibhavgupta40@gmail.com>
In-Reply-To: <20200526080324.69828-1-vaibhavgupta40@gmail.com>
References: <20200526080324.69828-1-vaibhavgupta40@gmail.com>
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compile-tested only

Drivers should not save device registers and/or change the power state of
the device. As per the generic PM approach, these are handled by PCI core.

The driver should support dev_pm_ops callbacks and bind them to pci_driver.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/amd/amd8111e.c | 30 +++++++++++------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/amd/amd8111e.c b/drivers/net/ethernet/amd/amd8111e.c
index 7a1286f8e983..c6591b33abcc 100644
--- a/drivers/net/ethernet/amd/amd8111e.c
+++ b/drivers/net/ethernet/amd/amd8111e.c
@@ -1580,9 +1580,10 @@ static void amd8111e_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	if(!err)
 		netif_wake_queue(dev);
 }
-static int amd8111e_suspend(struct pci_dev *pci_dev, pm_message_t state)
+
+static int amd8111e_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pci_dev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct amd8111e_priv *lp = netdev_priv(dev);
 
 	if (!netif_running(dev))
@@ -1609,34 +1610,24 @@ static int amd8111e_suspend(struct pci_dev *pci_dev, pm_message_t state)
 		if(lp->options & OPTION_WAKE_PHY_ENABLE)
 			amd8111e_enable_link_change(lp);
 
-		pci_enable_wake(pci_dev, PCI_D3hot, 1);
-		pci_enable_wake(pci_dev, PCI_D3cold, 1);
+		device_set_wakeup_enable(dev_d, 1);
 
 	}
 	else{
-		pci_enable_wake(pci_dev, PCI_D3hot, 0);
-		pci_enable_wake(pci_dev, PCI_D3cold, 0);
+		device_set_wakeup_enable(dev_d, 0);
 	}
 
-	pci_save_state(pci_dev);
-	pci_set_power_state(pci_dev, PCI_D3hot);
-
 	return 0;
 }
-static int amd8111e_resume(struct pci_dev *pci_dev)
+
+static int amd8111e_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pci_dev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct amd8111e_priv *lp = netdev_priv(dev);
 
 	if (!netif_running(dev))
 		return 0;
 
-	pci_set_power_state(pci_dev, PCI_D0);
-	pci_restore_state(pci_dev);
-
-	pci_enable_wake(pci_dev, PCI_D3hot, 0);
-	pci_enable_wake(pci_dev, PCI_D3cold, 0); /* D3 cold */
-
 	netif_device_attach(dev);
 
 	spin_lock_irq(&lp->lock);
@@ -1918,13 +1909,14 @@ static const struct pci_device_id amd8111e_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, amd8111e_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(amd8111e_pm_ops, amd8111e_suspend, amd8111e_resume);
+
 static struct pci_driver amd8111e_driver = {
 	.name   	= MODULE_NAME,
 	.id_table	= amd8111e_pci_tbl,
 	.probe		= amd8111e_probe_one,
 	.remove		= amd8111e_remove_one,
-	.suspend	= amd8111e_suspend,
-	.resume		= amd8111e_resume
+	.driver.pm	= &amd8111e_pm_ops
 };
 
 module_pci_driver(amd8111e_driver);
-- 
2.26.2