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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>,
        Stanislav Yakovlev <stas.yakovlev@gmail.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Vaibhav Gupta <vaibhavgupta40@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        skhan@linuxfoundation.org
Subject: [PATCH v1 2/2] ipw2200: use generic power management
Date:   Mon, 29 Jun 2020 09:02:26 +0530
Message-Id: <20200629033226.160936-3-vaibhavgupta40@gmail.com>
In-Reply-To: <20200629033226.160936-1-vaibhavgupta40@gmail.com>
References: <20200629033226.160936-1-vaibhavgupta40@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

With legacy PM, drivers themselves were responsible for managing the
device's power states and takes care of register states.

After upgrading to the generic structure, PCI core will take care of
required tasks and drivers should do only device-specific operations.

The driver was invoking PCI helper functions like pci_save/restore_state(),
pci_enable/disable_device() and pci_set_power_state(), which is not
recommended.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/wireless/intel/ipw2x00/ipw2200.c | 30 +++++---------------
 1 file changed, 7 insertions(+), 23 deletions(-)

diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.c b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
index 661e63bfc892..39ff3a426092 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
@@ -11838,10 +11838,9 @@ static void ipw_pci_remove(struct pci_dev *pdev)
 	free_firmware();
 }
 
-#ifdef CONFIG_PM
-static int ipw_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused ipw_pci_suspend(struct device *dev_d)
 {
-	struct ipw_priv *priv = pci_get_drvdata(pdev);
+	struct ipw_priv *priv = dev_get_drvdata(dev_d);
 	struct net_device *dev = priv->net_dev;
 
 	printk(KERN_INFO "%s: Going into suspend...\n", dev->name);
@@ -11852,33 +11851,20 @@ static int ipw_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	/* Remove the PRESENT state of the device */
 	netif_device_detach(dev);
 
-	pci_save_state(pdev);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
 	priv->suspend_at = ktime_get_boottime_seconds();
 
 	return 0;
 }
 
-static int ipw_pci_resume(struct pci_dev *pdev)
+static int __maybe_unused ipw_pci_resume(struct device *dev_d)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_d);
 	struct ipw_priv *priv = pci_get_drvdata(pdev);
 	struct net_device *dev = priv->net_dev;
-	int err;
 	u32 val;
 
 	printk(KERN_INFO "%s: Coming out of suspend...\n", dev->name);
 
-	pci_set_power_state(pdev, PCI_D0);
-	err = pci_enable_device(pdev);
-	if (err) {
-		printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
-		       dev->name);
-		return err;
-	}
-	pci_restore_state(pdev);
-
 	/*
 	 * Suspend/Resume resets the PCI configuration space, so we have to
 	 * re-disable the RETRY_TIMEOUT register (0x41) to keep PCI Tx retries
@@ -11900,7 +11886,6 @@ static int ipw_pci_resume(struct pci_dev *pdev)
 
 	return 0;
 }
-#endif
 
 static void ipw_pci_shutdown(struct pci_dev *pdev)
 {
@@ -11912,16 +11897,15 @@ static void ipw_pci_shutdown(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static SIMPLE_DEV_PM_OPS(ipw_pci_pm_ops, ipw_pci_suspend, ipw_pci_resume);
+
 /* driver initialization stuff */
 static struct pci_driver ipw_driver = {
 	.name = DRV_NAME,
 	.id_table = card_ids,
 	.probe = ipw_pci_probe,
 	.remove = ipw_pci_remove,
-#ifdef CONFIG_PM
-	.suspend = ipw_pci_suspend,
-	.resume = ipw_pci_resume,
-#endif
+	.driver.pm = &ipw_pci_pm_ops,
 	.shutdown = ipw_pci_shutdown,
 };
 
-- 
2.27.0