mediatek: replace hack for MaxLinear 2.5G PHY

Replace hack with proper patch also for Linux 5.15.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/patches-5.15/732-net-phy-mxl-gpy-don-t-use-SGMII-AN-if-using-phylink.patch

@@ -0,0 +1,63 @@
+From a969b663c866129ed9eb217785a6574fbe826f1d Mon Sep 17 00:00:00 2001
+From: Daniel Golle <[email protected]>
+Date: Thu, 6 Apr 2023 23:36:50 +0100
+Subject: [PATCH] net: phy: mxl-gpy: don't use SGMII AN if using phylink
+
+MAC drivers using phylink expect SGMII in-band-status to be switched off
+when attached to a PHY. Make sure this is the case also for mxl-gpy which
+keeps SGMII in-band-status in case of SGMII interface mode is used.
+
+Signed-off-by: Daniel Golle <[email protected]>
+---
+ drivers/net/phy/mxl-gpy.c | 19 ++++++++++++++++---
+ 1 file changed, 16 insertions(+), 3 deletions(-)
+
+--- a/drivers/net/phy/mxl-gpy.c
++++ b/drivers/net/phy/mxl-gpy.c
+@@ -191,8 +191,11 @@ static bool gpy_2500basex_chk(struct phy
+
+ 	phydev->speed = SPEED_2500;
+ 	phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+-	phy_modify_mmd(phydev, MDIO_MMD_VEND1, VSPEC1_SGMII_CTRL,
+-		       VSPEC1_SGMII_CTRL_ANEN, 0);
++
++	if (!phydev->phylink)
++		phy_modify_mmd(phydev, MDIO_MMD_VEND1, VSPEC1_SGMII_CTRL,
++			       VSPEC1_SGMII_CTRL_ANEN, 0);
++
+ 	return true;
+ }
+
+@@ -216,6 +219,14 @@ static int gpy_config_aneg(struct phy_de
+ 	u32 adv;
+ 	int ret;
+
++	/* Disable SGMII auto-negotiation if using phylink */
++	if (phydev->phylink) {
++		ret = phy_modify_mmd(phydev, MDIO_MMD_VEND1, VSPEC1_SGMII_CTRL,
++				     VSPEC1_SGMII_CTRL_ANEN, 0);
++		if (ret < 0)
++			return ret;
++	}
++
+ 	if (phydev->autoneg == AUTONEG_DISABLE) {
+ 		/* Configure half duplex with genphy_setup_forced,
+ 		 * because genphy_c45_pma_setup_forced does not support.
+@@ -306,6 +317,8 @@ static void gpy_update_interface(struct
+ 	switch (phydev->speed) {
+ 	case SPEED_2500:
+ 		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
++		if (phydev->phylink)
++			break;
+ 		ret = phy_modify_mmd(phydev, MDIO_MMD_VEND1, VSPEC1_SGMII_CTRL,
+ 				     VSPEC1_SGMII_CTRL_ANEN, 0);
+ 		if (ret < 0)
+@@ -317,7 +330,7 @@ static void gpy_update_interface(struct
+ 	case SPEED_100:
+ 	case SPEED_10:
+ 		phydev->interface = PHY_INTERFACE_MODE_SGMII;
+-		if (gpy_sgmii_aneg_en(phydev))
++		if (phydev->phylink || gpy_sgmii_aneg_en(phydev))
+ 			break;
+ 		/* Enable and restart SGMII ANEG for 10/100/1000Mbps link speed
+ 		 * if ANEG is disabled (in 2500-BaseX mode).