[PATCH net-next v3 7/7] net: dsa: microchip: do not shut down the switch if WoL is active

[Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>]

For Wake on Lan we should not reconfigure, reset or power down the
switch on shut down sequence.

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
 drivers/net/dsa/microchip/ksz9477_i2c.c |  3 +++
 drivers/net/dsa/microchip/ksz_common.c  | 18 ++++++++++++++++++
 drivers/net/dsa/microchip/ksz_common.h  |  2 ++
 drivers/net/dsa/microchip/ksz_spi.c     |  3 +++
 4 files changed, 26 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c b/drivers/net/dsa/microchip/ksz9477_i2c.c
index 2710afad4f3a..fe818742051c 100644
--- a/drivers/net/dsa/microchip/ksz9477_i2c.c
+++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
@@ -66,6 +66,9 @@ static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
 	if (!dev)
 		return;
 
+	if (ksz_wol_is_active(dev))
+		return;
+
 	if (dev->dev_ops->reset)
 		dev->dev_ops->reset(dev);
 
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 820edda82cea..c3669b9cc6ce 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2959,6 +2959,24 @@ static int ksz_set_wol(struct dsa_switch *ds, int port,
 	return -EOPNOTSUPP;
 }
 
+bool ksz_wol_is_active(struct ksz_device *dev)
+{
+	struct dsa_port *dp;
+
+	if (!dev->wakeup_source)
+		return false;
+
+	dsa_switch_for_each_user_port(dp, dev->ds) {
+		struct ethtool_wolinfo wol;
+
+		ksz_get_wol(dev->ds, dp->index, &wol);
+		if (wol.wolopts)
+			return true;
+	}
+
+	return false;
+}
+
 static void ksz_set_xmii(struct ksz_device *dev, int port,
 			 phy_interface_t interface)
 {
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 80679f38ee12..84b1eed8cd2a 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -397,6 +397,8 @@ bool ksz_get_gbit(struct ksz_device *dev, int port);
 phy_interface_t ksz_get_xmii(struct ksz_device *dev, int port, bool gbit);
 extern const struct ksz_chip_data ksz_switch_chips[];
 
+bool ksz_wol_is_active(struct ksz_device *dev);
+
 /* Common register access functions */
 static inline struct regmap *ksz_regmap_8(struct ksz_device *dev)
 {
diff --git a/drivers/net/dsa/microchip/ksz_spi.c b/drivers/net/dsa/microchip/ksz_spi.c
index 279338451621..c5d9c3d86ddb 100644
--- a/drivers/net/dsa/microchip/ksz_spi.c
+++ b/drivers/net/dsa/microchip/ksz_spi.c
@@ -114,6 +114,9 @@ static void ksz_spi_shutdown(struct spi_device *spi)
 	if (!dev)
 		return;
 
+	if (ksz_wol_is_active(dev))
+		return;
+
 	if (dev->dev_ops->reset)
 		dev->dev_ops->reset(dev);
 
-- 
2.39.2