netdev - [PATCH net-next] net: fec: add pm runtime force suspend and resume support

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Date:   Tue,  6 Sep 2022 16:39:23 +0800
From:   wei.fang@....com
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next] net: fec: add pm runtime force suspend and resume support

From: Wei Fang <wei.fang@....com>

Force mii bus into runtime pm suspend state during device suspends,
since phydev state is already PHY_HALTED, and there is no need to
access mii bus during device suspend state. Then force mii bus into
runtime pm resume state when device resumes.

Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/fec.h      |  1 +
 drivers/net/ethernet/freescale/fec_main.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 0cebe4b63adb..521f60c7f2e0 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -579,6 +579,7 @@ struct fec_enet_private {
 	struct device_node *phy_node;
 	bool	rgmii_txc_dly;
 	bool	rgmii_rxc_dly;
+	bool	rpm_active;
 	int	link;
 	int	full_duplex;
 	int	speed;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 7211597d323d..13210b216ee4 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -4092,6 +4092,7 @@ static int __maybe_unused fec_suspend(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct fec_enet_private *fep = netdev_priv(ndev);
+	int ret;
 
 	rtnl_lock();
 	if (netif_running(ndev)) {
@@ -4116,6 +4117,15 @@ static int __maybe_unused fec_suspend(struct device *dev)
 		}
 		/* It's safe to disable clocks since interrupts are masked */
 		fec_enet_clk_enable(ndev, false);
+
+		fep->rpm_active = !pm_runtime_status_suspended(dev);
+		if (fep->rpm_active) {
+			ret = pm_runtime_force_suspend(dev);
+			if (ret < 0) {
+				rtnl_unlock();
+				return ret;
+			}
+		}
 	}
 	rtnl_unlock();
 
@@ -4146,6 +4156,9 @@ static int __maybe_unused fec_resume(struct device *dev)
 
 	rtnl_lock();
 	if (netif_running(ndev)) {
+		if (fep->rpm_active)
+			pm_runtime_force_resume(dev);
+
 		ret = fec_enet_clk_enable(ndev, true);
 		if (ret) {
 			rtnl_unlock();
-- 
2.25.1