From 0de82310d2b32e78ff79d42c08b1122a6ede3778 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Sun, 30 Apr 2023 00:15:41 +0100 Subject: [PATCH] net: phy: realtek: detect early version of RTL8221B Early versions (?) of the RTL8221B PHY cannot be identified in a regular Clause-45 bus scan as the PHY doesn't report the implemented MMDs correctly but returns 0 instead. Implement custom identify function using the PKGID instead of iterating over the implemented MMDs. Signed-off-by: Daniel Golle --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -744,6 +744,38 @@ static int rtl8226_match_phy_device(stru rtlgen_supports_2_5gbps(phydev); } +static int rtl8221b_vb_cg_match_phy_device(struct phy_device *phydev) +{ + int val; + u32 id; + + if (phydev->mdio.bus->probe_capabilities >= MDIOBUS_C45) { + val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PKGID1); + if (val < 0) + return 0; + + id = val << 16; + val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PKGID2); + if (val < 0) + return 0; + + id |= val; + } else { + val = phy_read(phydev, MII_PHYSID1); + if (val < 0) + return 0; + + id = val << 16; + val = phy_read(phydev, MII_PHYSID2); + if (val < 0) + return 0; + + id |= val; + } + + return (id == 0x001cc849); +} + static int rtl822x_probe(struct phy_device *phydev) { struct device *dev = &phydev->mdio.dev; @@ -1084,7 +1116,7 @@ static struct phy_driver realtek_drvs[] .write_page = rtl821x_write_page, .soft_reset = genphy_soft_reset, }, { - PHY_ID_MATCH_EXACT(0x001cc849), + .match_phy_device = rtl8221b_vb_cg_match_phy_device, .name = "RTL8221B-VB-CG 2.5Gbps PHY", .get_features = rtl822x_get_features, .config_init = rtl8221b_config_init,