Merge branch 'rswitch-add-pm-ops'

Yoshihiro Shimoda says:

====================
rswitch: Add PM ops

This patch is based on the latest net-next.git / next branch.
After applied this patch with the following patches, the system can
enter/exit Suspend to Idle without any error:
https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git/commit/?h=next&id=aa4c0bbf820ddb9dd8105a403aa12df57b9e5129
https://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git/commit/?h=next&id=1a5361189b7acac15b9b086b2300a11b7aa84c06
====================

Link: https://lore.kernel.org/r/20231017113402.849735-1-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 50 insertions, 5 deletions

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 112e605f104a..43a7795d6591 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -17,6 +17,7 @@
 #include <linux/of_net.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/rtnetlink.h>
 #include <linux/slab.h>
@@ -1315,6 +1316,7 @@ static int rswitch_phy_device_init(struct rswitch_device *rdev)
 	if (!phydev)
 		goto out;
 	__set_bit(rdev->etha->phy_interface, phydev->host_interfaces);
+	phydev->mac_managed_pm = true;
 
 	phydev = of_phy_connect(rdev->ndev, phy, rswitch_adjust_link, 0,
 				rdev->etha->phy_interface);
@@ -1405,7 +1407,8 @@ static void rswitch_ether_port_deinit_one(struct rswitch_device *rdev)
 
 static int rswitch_ether_port_init_all(struct rswitch_private *priv)
 {
-	int i, err;
+	unsigned int i;
+	int err;
 
 	rswitch_for_each_enabled_port(priv, i) {
 		err = rswitch_ether_port_init_one(priv->rdev[i]);
@@ -1786,7 +1789,8 @@ static void rswitch_device_free(struct rswitch_private *priv, int index)
 
 static int rswitch_init(struct rswitch_private *priv)
 {
-	int i, err;
+	unsigned int i;
+	int err;
 
 	for (i = 0; i < RSWITCH_NUM_PORTS; i++)
 		rswitch_etha_init(priv, i);
@@ -1816,7 +1820,7 @@ static int rswitch_init(struct rswitch_private *priv)
 	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
 		err = rswitch_device_alloc(priv, i);
 		if (err < 0) {
-			for (i--; i >= 0; i--)
+			for (; i-- > 0; )
 				rswitch_device_free(priv, i);
 			goto err_device_alloc;
 		}
@@ -1959,7 +1963,7 @@ static int renesas_eth_sw_probe(struct platform_device *pdev)
 
 static void rswitch_deinit(struct rswitch_private *priv)
 {
-	int i;
+	unsigned int i;
 
 	rswitch_gwca_hw_deinit(priv);
 	rcar_gen4_ptp_unregister(priv->ptp_priv);
@@ -1993,11 +1997,52 @@ static void renesas_eth_sw_remove(struct platform_device *pdev)
 	platform_set_drvdata(pdev, NULL);
 }
 
+static int renesas_eth_sw_suspend(struct device *dev)
+{
+	struct rswitch_private *priv = dev_get_drvdata(dev);
+	struct net_device *ndev;
+	unsigned int i;
+
+	rswitch_for_each_enabled_port(priv, i) {
+		ndev = priv->rdev[i]->ndev;
+		if (netif_running(ndev)) {
+			netif_device_detach(ndev);
+			rswitch_stop(ndev);
+		}
+		if (priv->rdev[i]->serdes->init_count)
+			phy_exit(priv->rdev[i]->serdes);
+	}
+
+	return 0;
+}
+
+static int renesas_eth_sw_resume(struct device *dev)
+{
+	struct rswitch_private *priv = dev_get_drvdata(dev);
+	struct net_device *ndev;
+	unsigned int i;
+
+	rswitch_for_each_enabled_port(priv, i) {
+		phy_init(priv->rdev[i]->serdes);
+		ndev = priv->rdev[i]->ndev;
+		if (netif_running(ndev)) {
+			rswitch_open(ndev);
+			netif_device_attach(ndev);
+		}
+	}
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(renesas_eth_sw_pm_ops, renesas_eth_sw_suspend,
+				renesas_eth_sw_resume);
+
 static struct platform_driver renesas_eth_sw_driver_platform = {
 	.probe = renesas_eth_sw_probe,
 	.remove_new = renesas_eth_sw_remove,
 	.driver = {
 		.name = "renesas_eth_sw",
+		.pm = pm_sleep_ptr(&renesas_eth_sw_pm_ops),
 		.of_match_table = renesas_eth_sw_of_table,
 	}
 };
diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index 04f49a7a5843..27c9d3872c0e 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/drivers/net/ethernet/renesas/rswitch.h
@@ -20,7 +20,7 @@
 		else
 
 #define rswitch_for_each_enabled_port_continue_reverse(priv, i)	\
-	for (i--; i >= 0; i--)					\
+	for (; i-- > 0; )					\
 		if (priv->rdev[i]->disabled)			\
 			continue;				\
 		else