[PATCH net-next 3/6] net: phy: update in-band AN mode when changing interface by PHY driver

[Choong Yong Liang]

From: "Tan, Tee Min" <tee.min.tan@xxxxxxxxxxxxxxx>

Add cur_link_an_mode into phy_device struct for PHY drivers to
communicate the in-band AN mode setting with phylink framework.

As there is a mechanism in PHY drivers to switch the PHY interface
between SGMII and 2500BaseX according to link speed. In this case,
the in-band AN mode should be switching based on the PHY interface
as well, if the PHY interface has been changed/updated by PHY driver.

For e.g., disable in-band AN in 2500BaseX mode, or enable in-band AN
back for SGMII mode (10/100/1000Mbps).

Signed-off-by: Tan, Tee Min <tee.min.tan@xxxxxxxxxxxxxxx>
Signed-off-by: Choong Yong Liang <yong.liang.choong@xxxxxxxxxxxxxxx>
---
 drivers/net/phy/marvell10g.c | 6 ++++++
 drivers/net/phy/phylink.c    | 3 +++
 include/linux/phy.h          | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 55d9d7acc32e..5cf26d02841d 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -30,6 +30,7 @@
 #include <linux/phy.h>
 #include <linux/sfp.h>
 #include <linux/netdevice.h>
+#include <linux/phylink.h>
 
 #define MV_PHY_ALASKA_NBT_QUIRK_MASK	0xfffffffe
 #define MV_PHY_ALASKA_NBT_QUIRK_REV	(MARVELL_PHY_ID_88X3310 | 0xa)
@@ -939,6 +940,9 @@ static void mv3310_update_interface(struct phy_device *phydev)
 	 * xaui / rxaui modes according to the speed.
 	 * Florian suggests setting phydev->interface to communicate this to the
 	 * MAC. Only do this if we are already in one of the above modes.
+	 * In-band Auto-negotiation is not supported in 2500BASE-X.
+	 * Setting phydev->cur_link_an_mode to communicate this to the
+	 * phylink framework.
 	 */
 	switch (phydev->speed) {
 	case SPEED_10000:
@@ -949,11 +953,13 @@ static void mv3310_update_interface(struct phy_device *phydev)
 		break;
 	case SPEED_2500:
 		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+		phydev->cur_link_an_mode = MLO_AN_PHY;
 		break;
 	case SPEED_1000:
 	case SPEED_100:
 	case SPEED_10:
 		phydev->interface = PHY_INTERFACE_MODE_SGMII;
+		phydev->cur_link_an_mode = MLO_AN_INBAND;
 		break;
 	default:
 		break;
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 97c15e1f81de..d5783ea95eee 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1654,6 +1654,7 @@ static void phylink_phy_change(struct phy_device *phydev, bool up)
 		pl->phy_state.pause |= MLO_PAUSE_RX;
 	pl->phy_state.interface = phydev->interface;
 	pl->phy_state.link = up;
+	pl->cur_link_an_mode = phydev->cur_link_an_mode;
 	mutex_unlock(&pl->state_mutex);
 
 	phylink_run_resolve(pl);
@@ -1758,6 +1759,8 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 	if (pl->config->mac_managed_pm)
 		phy->mac_managed_pm = true;
 
+	pl->phydev->cur_link_an_mode = pl->cur_link_an_mode;
+
 	return 0;
 }
 
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 11c1e91563d4..c685b526e307 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -756,6 +756,8 @@ struct phy_device {
 	/* MACsec management functions */
 	const struct macsec_ops *macsec_ops;
 #endif
+	/* For communicate the AN mode setting with phylink framework. */
+	u8 cur_link_an_mode;
 };
 
 /* Generic phy_device::dev_flags */
-- 
2.25.1