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f6c27b22f6
Avoid crashing the kernel when trying to detect early versions of RealTek RTL8221B 2.5G Ethernet PHY. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
91 lines
2.4 KiB
Diff
91 lines
2.4 KiB
Diff
From e52faf1564a8bcaf866f9a6c7bf0e8a8748afb15 Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Sun, 30 Apr 2023 00:15:41 +0100
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Subject: [PATCH] net: phy: realtek: detect early version of RTL8221B
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Early versions (?) of the RTL8221B PHY cannot be identified in a regular
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Clause-45 bus scan as the PHY doesn't report the implemented MMDs
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correctly but returns 0 instead.
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Implement custom identify function using the PKGID instead of iterating
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over the implemented MMDs.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/net/phy/realtek.c | 50 ++++++++++++++++++++++++++++++++++++++-
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1 file changed, 49 insertions(+), 1 deletion(-)
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--- a/drivers/net/phy/realtek.c
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+++ b/drivers/net/phy/realtek.c
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@@ -81,6 +81,7 @@
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#define RTL_GENERIC_PHYID 0x001cc800
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#define RTL_8211FVD_PHYID 0x001cc878
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+#define RTL_8221B_VB_CG 0x001cc849
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MODULE_DESCRIPTION("Realtek PHY driver");
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MODULE_AUTHOR("Johnson Leung");
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@@ -801,6 +802,54 @@ static int rtl822x_probe(struct phy_devi
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return 0;
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}
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+static int rtl8221b_vb_cg_match_phy_device(struct phy_device *phydev)
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+{
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+ int val;
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+ u32 id;
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+
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+ if (phydev->is_c45) {
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+ if (phydev->c45_ids.device_ids[1])
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+ return phydev->c45_ids.device_ids[1] == RTL_8221B_VB_CG;
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+ } else {
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+ if (phydev->phy_id)
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+ return phydev->phy_id == RTL_8221B_VB_CG;
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+ }
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+
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+ if (phydev->mdio.bus->read_c45) {
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+ val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PKGID1);
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+ if (val < 0)
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+ return 0;
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+
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+ id = val << 16;
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+ val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PKGID2);
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+ if (val < 0)
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+ return 0;
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+
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+ id |= val;
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+ } else {
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+ val = phy_read(phydev, MII_PHYSID1);
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+ if (val < 0)
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+ return 0;
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+
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+ id = val << 16;
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+ val = phy_read(phydev, MII_PHYSID2);
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+ if (val < 0)
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+ return 0;
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+
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+ id |= val;
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+ }
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+
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+ if (id != RTL_8221B_VB_CG)
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+ return 0;
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+
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+ if (phydev->is_c45)
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+ phydev->c45_ids.device_ids[1] = id;
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+ else
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+ phydev->phy_id = id;
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+
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+ return 1;
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+}
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+
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static int rtlgen_resume(struct phy_device *phydev)
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{
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int ret = genphy_resume(phydev);
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@@ -1134,7 +1183,7 @@ static struct phy_driver realtek_drvs[]
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.write_page = rtl821x_write_page,
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.soft_reset = genphy_soft_reset,
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}, {
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- PHY_ID_MATCH_EXACT(0x001cc849),
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+ .match_phy_device = rtl8221b_vb_cg_match_phy_device,
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.name = "RTL8221B-VB-CG 2.5Gbps PHY",
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.get_features = rtl822x_get_features,
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.config_init = rtl8221b_config_init,
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