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

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Message-ID: <537a12131132614ce9600ca9370dab823a262347.1683756691.git.daniel@makrotopia.org>
Date:   Thu, 11 May 2023 00:54:36 +0200
From:   Chukun Pan <amadeus@....edu.cn>
To:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH net-next 2/8] net: phy: realtek: switch interface mode for
 RTL822x series

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@....edu.cn>
Signed-off-by: Daniel Golle <daniel@...rotopia.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 a7dd5a075135..4a2c1ad02d48 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