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From e52faf1564a8bcaf866f9a6c7bf0e8a8748afb15 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
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 <daniel@makrotopia.org>
---
drivers/net/phy/realtek.c | 50 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 49 insertions(+), 1 deletion(-)
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -81,6 +81,7 @@
#define RTL_GENERIC_PHYID 0x001cc800
#define RTL_8211FVD_PHYID 0x001cc878
+#define RTL_8221B_VB_CG 0x001cc849
MODULE_DESCRIPTION("Realtek PHY driver");
MODULE_AUTHOR("Johnson Leung");
@@ -801,6 +802,54 @@ static int rtl822x_probe(struct phy_devi
return 0;
}
+static int rtl8221b_vb_cg_match_phy_device(struct phy_device *phydev)
+{
+ int val;
+ u32 id;
+
+ if (phydev->is_c45) {
+ if (phydev->c45_ids.device_ids[1])
+ return phydev->c45_ids.device_ids[1] == RTL_8221B_VB_CG;
+ } else {
+ if (phydev->phy_id)
+ return phydev->phy_id == RTL_8221B_VB_CG;
+ }
+
+ if (phydev->mdio.bus->read_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;
+ }
+
+ if (id != RTL_8221B_VB_CG)
+ return 0;
+
+ if (phydev->is_c45)
+ phydev->c45_ids.device_ids[1] = id;
+ else
+ phydev->phy_id = id;
+
+ return 1;
+}
+
static int rtlgen_resume(struct phy_device *phydev)
{
int ret = genphy_resume(phydev);
@@ -1134,7 +1183,7 @@ 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,
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