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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>
28 lines
972 B
Diff
28 lines
972 B
Diff
From 1addfb042a9d27788a0fb2c2935045b56fd8560e Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Thu, 23 Jan 2025 03:25:29 +0000
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Subject: [PATCH] net: phy: realtek: mark existing MMDs as present
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When using Clause-45 mode to access RealTek RTL8221B 2.5G PHYs some
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versions of the PHY fail to report the MMDs present on the PHY.
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Mark MMDs PMAPMD, PCS and AN which are always existing according to
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the datasheet as present to fix that.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/net/phy/realtek/realtek_main.c | 3 +++
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1 file changed, 3 insertions(+)
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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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@@ -1043,6 +1043,9 @@ static int rtl822x_c45_get_features(stru
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linkmode_set_bit(ETHTOOL_LINK_MODE_TP_BIT,
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phydev->supported);
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+ phydev->c45_ids.mmds_present |= MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS |
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+ MDIO_DEVS_AN;
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+
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return genphy_c45_pma_read_abilities(phydev);
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}
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