[RFC PATCH net-next 2/8] net: phy: realtek: switch interface mode for RTL822x series

[Daniel Golle <daniel@makrotopia.org>]

From: Chukun Pan <amadeus@jmu.edu.cn>

The RTL822x phy can work in Cisco SGMII and 2500BASE-X modes respectively.
Add interface automatic switching MAC-side interface mode for RTL822x
phy to match various wire speeds when using Clause-45 MDIO.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/net/phy/realtek.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 6389abaab6d5a..34fd86b8ecf7d 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -684,6 +684,25 @@ static int rtl822x_config_aneg(struct phy_device *phydev)
 	return __genphy_config_aneg(phydev, ret);
 }
 
+static void rtl822x_update_interface(struct phy_device *phydev)
+{
+	/* Automatically switch SERDES interface between
+	 * SGMII and 2500-BaseX according to speed.
+	 */
+	switch (phydev->speed) {
+	case SPEED_2500:
+		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+		break;
+	case SPEED_1000:
+	case SPEED_100:
+	case SPEED_10:
+		phydev->interface = PHY_INTERFACE_MODE_SGMII;
+		break;
+	default:
+		break;
+	}
+}
+
 static int rtl822x_read_status(struct phy_device *phydev)
 {
 	int ret;
@@ -702,11 +721,14 @@ static int rtl822x_read_status(struct phy_device *phydev)
 			phydev->lp_advertising, lpadv & RTL_LPADV_2500FULL);
 	}
 
-	ret = genphy_read_status(phydev);
+	ret = rtlgen_read_status(phydev);
 	if (ret < 0)
 		return ret;
 
-	return rtlgen_get_speed(phydev);
+	if (phydev->is_c45 && phydev->link)
+		rtl822x_update_interface(phydev);
+
+	return 0;
 }
 
 static bool rtlgen_supports_2_5gbps(struct phy_device *phydev)
-- 
2.40.0