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generic: net: phy: realtek: detect early version of RTL8221B

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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 to work-around this problem.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2023-04-30 03:59:55 +01:00
parent 45f5115253
commit 28b3a5e6b5
1 changed files with 63 additions and 0 deletions
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63
target/linux/generic/pending-5.15/730-net-phy-realtek-detect-early-version-of-RTL8221B.patch Normal file
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@ -0,0 +1,63 @@
From 0de82310d2b32e78ff79d42c08b1122a6ede3778 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>
--- 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,