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

Daniel Golle
2023-05-10T22:59:15Z

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 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