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kernel: rtl8261n: add post-reset MDIO stabilization delay

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After the RTL8261N asserts a reset, the MDIO bus becomes temporarily
unavailable during the chip's reinitialization sequence. Any subsequent
read or write issued before the PHY has stabilized will fail.

Add a 30ms delay after triggering the reset to ensure the chip is reachable
via MDIO before resuming communication.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Link: https://github.com/openwrt/openwrt/pull/23076
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Jonas Jelonek 2026-04-24 11:07:34 +02:00 committed by Hauke Mehrtens
parent dd5bd85a1f
commit 51992c87c8
1 changed files with 1 additions and 0 deletions
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target/linux/generic/files/drivers/net/phy/rtl8261n/rtk_phy.c
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@ -81,6 +81,7 @@ static int rtkphy_config_init(struct phy_device *phydev)
#if 1 /* toggle reset */
phy_modify_mmd_changed(phydev, 30, 0x145, BIT(0) , 1);
mdelay(30);
phy_modify_mmd_changed(phydev, 30, 0x145, BIT(0) , 0);
mdelay(30);
#endif