linux-kernel - [PATCH 5.8 43/56] net: ethernet: ti: cpsw

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Date:   Fri, 25 Sep 2020 14:48:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.8 43/56] net: ethernet: ti: cpsw_new: fix suspend/resume

From: Grygorii Strashko <grygorii.strashko@...com>

[ Upstream commit 5760d9acbe9514eec68eb70821d6fa5764f57042 ]

Add missed suspend/resume callbacks to properly restore networking after
suspend/resume cycle.

Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac")
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/ti/cpsw_new.c |   53 +++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -17,6 +17,7 @@
 #include <linux/phy.h>
 #include <linux/phy/phy.h>
 #include <linux/delay.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
@@ -2070,9 +2071,61 @@ static int cpsw_remove(struct platform_d
 	return 0;
 }
 
+static int __maybe_unused cpsw_suspend(struct device *dev)
+{
+	struct cpsw_common *cpsw = dev_get_drvdata(dev);
+	int i;
+
+	rtnl_lock();
+
+	for (i = 0; i < cpsw->data.slaves; i++) {
+		struct net_device *ndev = cpsw->slaves[i].ndev;
+
+		if (!(ndev && netif_running(ndev)))
+			continue;
+
+		cpsw_ndo_stop(ndev);
+	}
+
+	rtnl_unlock();
+
+	/* Select sleep pin state */
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int __maybe_unused cpsw_resume(struct device *dev)
+{
+	struct cpsw_common *cpsw = dev_get_drvdata(dev);
+	int i;
+
+	/* Select default pin state */
+	pinctrl_pm_select_default_state(dev);
+
+	/* shut up ASSERT_RTNL() warning in netif_set_real_num_tx/rx_queues */
+	rtnl_lock();
+
+	for (i = 0; i < cpsw->data.slaves; i++) {
+		struct net_device *ndev = cpsw->slaves[i].ndev;
+
+		if (!(ndev && netif_running(ndev)))
+			continue;
+
+		cpsw_ndo_open(ndev);
+	}
+
+	rtnl_unlock();
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cpsw_pm_ops, cpsw_suspend, cpsw_resume);
+
 static struct platform_driver cpsw_driver = {
 	.driver = {
 		.name	 = "cpsw-switch",
+		.pm	 = &cpsw_pm_ops,
 		.of_match_table = cpsw_of_mtable,
 	},
 	.probe = cpsw_probe,