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From: Justin Lai <justinlai0215@realtek.com>
To: <kuba@kernel.org>
CC: <davem@davemloft.net>, <edumazet@google.com>, <pabeni@redhat.com>,
        <linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
        <andrew@lunn.ch>, <jiri@resnulli.us>, <horms@kernel.org>,
        <pkshih@realtek.com>, <larry.chiu@realtek.com>,
        Justin Lai <justinlai0215@realtek.com>
Subject: [PATCH net-next v18 09/13] rtase: Implement pci_driver suspend and resume function
Date: Wed, 8 May 2024 20:39:41 +0800
Message-ID: <20240508123945.201524-10-justinlai0215@realtek.com>
In-Reply-To: <20240508123945.201524-1-justinlai0215@realtek.com>
References: <20240508123945.201524-1-justinlai0215@realtek.com>
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Implement the pci_driver suspend function to enable the device
to sleep, and implement the resume function to enable the device
to resume operation.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 .../net/ethernet/realtek/rtase/rtase_main.c   | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
index 61f12a3b79eb..4928397d88a5 100644
--- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
+++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
@@ -2197,12 +2197,63 @@ static void rtase_shutdown(struct pci_dev *pdev)
 	rtase_reset_interrupt(pdev, tp);
 }
 
+static int rtase_suspend(struct device *device)
+{
+	struct net_device *dev = dev_get_drvdata(device);
+
+	if (netif_running(dev)) {
+		netif_device_detach(dev);
+		rtase_hw_reset(dev);
+	}
+
+	return 0;
+}
+
+static int rtase_resume(struct device *device)
+{
+	struct net_device *dev = dev_get_drvdata(device);
+	struct rtase_private *tp = netdev_priv(dev);
+	int ret;
+
+	/* restore last modified mac address */
+	rtase_rar_set(tp, dev->dev_addr);
+
+	if (!netif_running(dev))
+		goto out;
+
+	rtase_wait_for_quiescence(dev);
+
+	rtase_tx_clear(tp);
+	rtase_rx_clear(tp);
+
+	ret = rtase_init_ring(dev);
+	if (ret) {
+		netdev_err(dev, "unable to init ring\n");
+		rtase_free_desc(tp);
+		return -ENOMEM;
+	}
+
+	rtase_hw_config(dev);
+	/* always link, so start to transmit & receive */
+	rtase_hw_start(dev);
+
+	netif_device_attach(dev);
+out:
+
+	return 0;
+}
+
+static const struct dev_pm_ops rtase_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(rtase_suspend, rtase_resume)
+};
+
 static struct pci_driver rtase_pci_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = rtase_pci_tbl,
 	.probe = rtase_init_one,
 	.remove = rtase_remove_one,
 	.shutdown = rtase_shutdown,
+	.driver.pm = pm_ptr(&rtase_pm_ops),
 };
 
 module_pci_driver(rtase_pci_driver);
-- 
2.34.1