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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
1.0 KiB
Diff
28 lines
1.0 KiB
Diff
From: Daniel Golle <daniel@makrotopia.org>
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Date: Thu, 30 Jan 2025 05:38:31 +0000
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Subject: [PATCH] net: phy: realtek: disable MDIO broadcast
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RealTek's PHYs by default also listen on MDIO address 0 which is defined
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as broadcast address. This can lead to problems if there is an actual PHY
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(such as MT7981 built-in PHY) present at this address, as accessing that
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PHY may then confuse the RealTek PHY.
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Disabled listening on the MDIO broadcast address to avoid such problems.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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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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@@ -849,6 +849,11 @@ static int rtl822xb_config_init(struct p
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phydev->host_interfaces) ||
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phydev->interface == PHY_INTERFACE_MODE_SGMII;
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+ /* disable listening on MDIO broadcast address (0) */
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+ ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, 0xa430, BIT(13));
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+ if (ret < 0)
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+ return ret;
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+
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/* fill in possible interfaces */
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__assign_bit(PHY_INTERFACE_MODE_2500BASEX, phydev->possible_interfaces,
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has_2500);
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