generic: 6.12: backport dsa support_eee patches

These patches are needed for b53 implementation of b53_support_eee, which
prevent system hangs on bmips devices.

99379f587278c net: dsa: provide implementation of .support_eee()
9723a77318b7c net: dsa: add hook to determine whether EEE is supported

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/generic/backport-6.12/700-01-v6.14-net-dsa-add-hook-to-determine-whether-EEE-is-support.patch

@@ -0,0 +1,54 @@
+From 9723a77318b7c0cfd06ea207e52a042f8c815318 Mon Sep 17 00:00:00 2001
+From: "Russell King (Oracle)" <[email protected]>
+Date: Tue, 10 Dec 2024 14:18:16 +0000
+Subject: [PATCH] net: dsa: add hook to determine whether EEE is supported
+
+Add a hook to determine whether the switch supports EEE. This will
+return false if the switch does not, or true if it does. If the
+method is not implemented, we assume (currently) that the switch
+supports EEE.
+
+Signed-off-by: Russell King (Oracle) <[email protected]>
+Reviewed-by: Florian Fainelli <[email protected]>
+Reviewed-by: Vladimir Oltean <[email protected]>
+Link: https://patch.msgid.link/[email protected]
+Signed-off-by: Jakub Kicinski <[email protected]>
+---
+ include/net/dsa.h | 1 +
+ net/dsa/user.c    | 8 ++++++++
+ 2 files changed, 9 insertions(+)
+
+--- a/include/net/dsa.h
++++ b/include/net/dsa.h
+@@ -1003,6 +1003,7 @@ struct dsa_switch_ops {
+ 	/*
+ 	 * Port's MAC EEE settings
+ 	 */
++	bool	(*support_eee)(struct dsa_switch *ds, int port);
+ 	int	(*set_mac_eee)(struct dsa_switch *ds, int port,
+ 			       struct ethtool_keee *e);
+ 	int	(*get_mac_eee)(struct dsa_switch *ds, int port,
+--- a/net/dsa/user.c
++++ b/net/dsa/user.c
+@@ -1231,6 +1231,10 @@ static int dsa_user_set_eee(struct net_d
+ 	struct dsa_switch *ds = dp->ds;
+ 	int ret;
+ 
++	/* Check whether the switch supports EEE */
++	if (ds->ops->support_eee && !ds->ops->support_eee(ds, dp->index))
++		return -EOPNOTSUPP;
++
+ 	/* Port's PHY and MAC both need to be EEE capable */
+ 	if (!dev->phydev || !dp->pl)
+ 		return -ENODEV;
+@@ -1251,6 +1255,10 @@ static int dsa_user_get_eee(struct net_d
+ 	struct dsa_switch *ds = dp->ds;
+ 	int ret;
+ 
++	/* Check whether the switch supports EEE */
++	if (ds->ops->support_eee && !ds->ops->support_eee(ds, dp->index))
++		return -EOPNOTSUPP;
++
+ 	/* Port's PHY and MAC both need to be EEE capable */
+ 	if (!dev->phydev || !dp->pl)
+ 		return -ENODEV;

target/linux/generic/backport-6.12/700-02-v6.14-net-dsa-provide-implementation-of-.support_eee.patch

@@ -0,0 +1,53 @@
+From 99379f587278c818777cb4778e2c79c6c1440c65 Mon Sep 17 00:00:00 2001
+From: "Russell King (Oracle)" <[email protected]>
+Date: Tue, 10 Dec 2024 14:18:21 +0000
+Subject: [PATCH] net: dsa: provide implementation of .support_eee()
+
+Provide a trivial implementation for the .support_eee() method which
+switch drivers can use to simply indicate that they support EEE on
+all their user ports.
+
+Signed-off-by: Russell King (Oracle) <[email protected]>
+Reviewed-by: Florian Fainelli <[email protected]>
+Reviewed-by: Vladimir Oltean <[email protected]>
+Link: https://patch.msgid.link/[email protected]
+Signed-off-by: Jakub Kicinski <[email protected]>
+---
+ include/net/dsa.h |  1 +
+ net/dsa/port.c    | 16 ++++++++++++++++
+ 2 files changed, 17 insertions(+)
+
+--- a/include/net/dsa.h
++++ b/include/net/dsa.h
+@@ -1399,5 +1399,6 @@ static inline bool dsa_user_dev_check(co
+ 
+ netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
+ void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
++bool dsa_supports_eee(struct dsa_switch *ds, int port);
+ 
+ #endif
+--- a/net/dsa/port.c
++++ b/net/dsa/port.c
+@@ -1589,6 +1589,22 @@ dsa_port_phylink_mac_select_pcs(struct p
+ 	return pcs;
+ }
+ 
++/* dsa_supports_eee - indicate that EEE is supported
++ * @ds: pointer to &struct dsa_switch
++ * @port: port index
++ *
++ * A default implementation for the .support_eee() DSA operations member,
++ * which drivers can use to indicate that they support EEE on all of their
++ * user ports.
++ *
++ * Returns: true
++ */
++bool dsa_supports_eee(struct dsa_switch *ds, int port)
++{
++	return true;
++}
++EXPORT_SYMBOL_GPL(dsa_supports_eee);
++
+ static void dsa_port_phylink_mac_config(struct phylink_config *config,
+ 					unsigned int mode,
+ 					const struct phylink_link_state *state)