ramips: simplify multi-phy support patches

For MT7620, we should always prevent main ethernet interface from
going down due to phy link changes. And the ralink net driver does
not support cable test function, so this patch won't change any
behavior.

Ref:
6fcba5eec3 ("ramips: port 0034-NET-multi-phy-support.patch to 5.4")

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/15591
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ramips/patches-6.6/720-NET-no-auto-carrier-off-support.patch

@@ -0,0 +1,31 @@
+From: John Crispin <blogic@openwrt.org>
+Date: Sun, 27 Jul 2014 09:38:50 +0100
+Subject: [PATCH] NET: multi phy support
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/net/phy/phy_device.c | 2 +-
+ include/linux/phy.h          | 1 +
+ 2 files changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/phy/phy_device.c
++++ b/drivers/net/phy/phy_device.c
+@@ -1075,7 +1075,7 @@ static void phy_link_change(struct phy_d
+ 
+ 	if (up)
+ 		netif_carrier_on(netdev);
+-	else
++	else if (!phydev->no_auto_carrier_off)
+ 		netif_carrier_off(netdev);
+ 	phydev->adjust_link(netdev);
+ 	if (phydev->mii_ts && phydev->mii_ts->link_state)
+--- a/include/linux/phy.h
++++ b/include/linux/phy.h
+@@ -659,6 +659,7 @@ struct phy_device {
+ 	unsigned downshifted_rate:1;
+ 	unsigned is_on_sfp_module:1;
+ 	unsigned mac_managed_pm:1;
++	unsigned no_auto_carrier_off:1;
+ 	unsigned wol_enabled:1;
+ 
+ 	unsigned autoneg:1;

target/linux/ramips/patches-6.6/720-Revert-net-phy-simplify-phy_link_change-arguments.patch

@@ -1,118 +0,0 @@
-From ffbb1b37a3e1ce1a5c574a6bd4f5aede8bc468ac Mon Sep 17 00:00:00 2001
-From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
-Date: Sat, 27 Feb 2021 20:20:07 -0800
-Subject: [PATCH] Revert "net: phy: simplify phy_link_change arguments"
-
-This reverts commit a307593a644443db12888f45eed0dafb5869e2cc.
-
-This brings back the do_carrier flags used by the (hacky) next patch,
-still required by target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c
----
- drivers/net/phy/phy.c        | 12 ++++++------
- drivers/net/phy/phy_device.c | 12 +++++++-----
- drivers/net/phy/phylink.c    |  3 ++-
- include/linux/phy.h          |  2 +-
- 4 files changed, 16 insertions(+), 13 deletions(-)
-
---- a/drivers/net/phy/phy.c
-+++ b/drivers/net/phy/phy.c
-@@ -72,13 +72,13 @@ static void phy_process_state_change(str
- 
- static void phy_link_up(struct phy_device *phydev)
- {
--	phydev->phy_link_change(phydev, true);
-+	phydev->phy_link_change(phydev, true, true);
- 	phy_led_trigger_change_speed(phydev);
- }
- 
--static void phy_link_down(struct phy_device *phydev)
-+static void phy_link_down(struct phy_device *phydev, bool do_carrier)
- {
--	phydev->phy_link_change(phydev, false);
-+	phydev->phy_link_change(phydev, false, do_carrier);
- 	phy_led_trigger_change_speed(phydev);
- 	WRITE_ONCE(phydev->link_down_events, phydev->link_down_events + 1);
- }
-@@ -823,7 +823,7 @@ int phy_start_cable_test(struct phy_devi
- 		goto out;
- 
- 	/* Mark the carrier down until the test is complete */
--	phy_link_down(phydev);
-+	phy_link_down(phydev, true);
- 
- 	netif_testing_on(dev);
- 	err = phydev->drv->cable_test_start(phydev);
-@@ -894,7 +894,7 @@ int phy_start_cable_test_tdr(struct phy_
- 		goto out;
- 
- 	/* Mark the carrier down until the test is complete */
--	phy_link_down(phydev);
-+	phy_link_down(phydev, true);
- 
- 	netif_testing_on(dev);
- 	err = phydev->drv->cable_test_tdr_start(phydev, config);
-@@ -966,7 +966,7 @@ static int phy_check_link_status(struct
- 		phy_link_up(phydev);
- 	} else if (!phydev->link && phydev->state != PHY_NOLINK) {
- 		phydev->state = PHY_NOLINK;
--		phy_link_down(phydev);
-+		phy_link_down(phydev, true);
- 	}
- 
- 	return 0;
-@@ -1485,7 +1485,7 @@ void phy_state_machine(struct work_struc
- 	case PHY_ERROR:
- 		if (phydev->link) {
- 			phydev->link = 0;
--			phy_link_down(phydev);
-+			phy_link_down(phydev, true);
- 		}
- 		do_suspend = true;
- 		break;
---- a/drivers/net/phy/phy_device.c
-+++ b/drivers/net/phy/phy_device.c
-@@ -1069,14 +1069,16 @@ struct phy_device *phy_find_first(struct
- }
- EXPORT_SYMBOL(phy_find_first);
- 
--static void phy_link_change(struct phy_device *phydev, bool up)
-+static void phy_link_change(struct phy_device *phydev, bool up, bool do_carrier)
- {
- 	struct net_device *netdev = phydev->attached_dev;
- 
--	if (up)
--		netif_carrier_on(netdev);
--	else
--		netif_carrier_off(netdev);
-+	if (do_carrier) {
-+		if (up)
-+			netif_carrier_on(netdev);
-+		else
-+			netif_carrier_off(netdev);
-+	}
- 	phydev->adjust_link(netdev);
- 	if (phydev->mii_ts && phydev->mii_ts->link_state)
- 		phydev->mii_ts->link_state(phydev->mii_ts, phydev);
---- a/drivers/net/phy/phylink.c
-+++ b/drivers/net/phy/phylink.c
-@@ -1724,7 +1724,8 @@ bool phylink_expects_phy(struct phylink
- }
- EXPORT_SYMBOL_GPL(phylink_expects_phy);
- 
--static void phylink_phy_change(struct phy_device *phydev, bool up)
-+static void phylink_phy_change(struct phy_device *phydev, bool up,
-+			       bool do_carrier)
- {
- 	struct phylink *pl = phydev->phylink;
- 	bool tx_pause, rx_pause;
---- a/include/linux/phy.h
-+++ b/include/linux/phy.h
-@@ -758,7 +758,7 @@ struct phy_device {
- 
- 	unsigned int link_down_events;
- 
--	void (*phy_link_change)(struct phy_device *phydev, bool up);
-+	void (*phy_link_change)(struct phy_device *, bool up, bool do_carrier);
- 	void (*adjust_link)(struct net_device *dev);
- 
- #if IS_ENABLED(CONFIG_MACSEC)

target/linux/ramips/patches-6.6/721-NET-no-auto-carrier-off-support.patch

@@ -1,47 +0,0 @@
-From 0b6eb1e68290243d439ee330ea8d0b239a5aec69 Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Sun, 27 Jul 2014 09:38:50 +0100
-Subject: [PATCH 34/53] NET: multi phy support
-
-Signed-off-by: John Crispin <blogic@openwrt.org>
----
- drivers/net/phy/phy.c |    9 ++++++---
- include/linux/phy.h   |    1 +
- 2 files changed, 7 insertions(+), 3 deletions(-)
-
---- a/drivers/net/phy/phy.c
-+++ b/drivers/net/phy/phy.c
-@@ -966,7 +966,10 @@ static int phy_check_link_status(struct
- 		phy_link_up(phydev);
- 	} else if (!phydev->link && phydev->state != PHY_NOLINK) {
- 		phydev->state = PHY_NOLINK;
--		phy_link_down(phydev, true);
-+		if (!phydev->no_auto_carrier_off)
-+			phy_link_down(phydev, true);
-+		else
-+			phy_link_down(phydev, false);
- 	}
- 
- 	return 0;
-@@ -1485,7 +1488,10 @@ void phy_state_machine(struct work_struc
- 	case PHY_ERROR:
- 		if (phydev->link) {
- 			phydev->link = 0;
--			phy_link_down(phydev, true);
-+			if (!phydev->no_auto_carrier_off)
-+				phy_link_down(phydev, true);
-+			else
-+				phy_link_down(phydev, false);
- 		}
- 		do_suspend = true;
- 		break;
---- a/include/linux/phy.h
-+++ b/include/linux/phy.h
-@@ -659,6 +659,7 @@ struct phy_device {
- 	unsigned downshifted_rate:1;
- 	unsigned is_on_sfp_module:1;
- 	unsigned mac_managed_pm:1;
-+	unsigned no_auto_carrier_off:1;
- 	unsigned wol_enabled:1;
- 
- 	unsigned autoneg:1;