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On some but not all devices using the RTL8221B 2.5GBit/s PHY the SerDes setup sequence may hang under some circumstances (eg. <2500M link partner present during boot). RTL8221B-VB-CG 2.5Gbps PHY (C45) mdio-bus:01: rtl822xb_config_init failed: -110 Work-around the issue by performing a hardware reset and subsequent retry of the SerDes setup, which seems to always succeed. Doing this requires moving ALDPS setup to config_init (which is anyway the better place for that) as it otherwise doesn't survive the reset. Also disable listening on MDIO address 0 which may be used by other PHYs despite being spec'ed as "broadcast address", as bus activity on address 0 may otherwise confuse the RealTek PHY for good reasons. Tested-by: Luis Mita <luis@luismita.com> Signed-off-by: Daniel Golle <daniel@makrotopia.org> (cherry picked from commit c87a767801ef375feadb0a5c41d5a674ad3a7d2c) Link: https://github.com/openwrt/openwrt/pull/17790 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
53 lines
1.5 KiB
Diff
53 lines
1.5 KiB
Diff
From 0de82310d2b32e78ff79d42c08b1122a6ede3778 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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[forward-port by @namiltd]
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Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
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--- a/drivers/net/phy/realtek/realtek_main.c
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+++ b/drivers/net/phy/realtek/realtek_main.c
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@@ -1166,10 +1166,32 @@ static int rtl8226_match_phy_device(stru
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static int rtlgen_is_c45_match(struct phy_device *phydev, unsigned int id,
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bool is_c45)
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{
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- if (phydev->is_c45)
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- return is_c45 && (id == phydev->c45_ids.device_ids[1]);
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- else
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+ if (phydev->is_c45) {
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+ u32 rid;
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+
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+ if (!is_c45)
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+ return 0;
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+
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+ rid = phydev->c45_ids.device_ids[1];
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+ if ((rid == 0xffffffff) && phydev->mdio.bus->read_c45) {
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+ int val;
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+
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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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+ rid = 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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+ rid |= val;
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+ }
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+
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+ return (id == rid);
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+ } else {
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return !is_c45 && (id == phydev->phy_id);
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+ }
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}
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static int rtl8221b_match_phy_device(struct phy_device *phydev)
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