netdev - realtek PHY commit bbc4d71d63549 causes regression

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Date:   Sat, 17 Oct 2020 16:20:36 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     "open list:BPF JIT for MIPS (32-BIT AND 64-BIT)" 
        <netdev@...r.kernel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Willy Liu <willy.liu@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Masahisa Kojima <masahisa.kojima@...aro.org>
Subject: realtek PHY commit bbc4d71d63549 causes regression

Hello all,

I just upgraded my arm64 SynQuacer box to 5.8.16 and lost all network
connectivity. This box has a on-SoC socionext 'netsec' network
controller wired to a Realtek 80211e PHY, and this was working without
problems until the following commit was merged

commit bbc4d71d63549bcd003a430de18a72a742d8c91e
Author: Willy Liu <willy.liu@...ltek.com>
Date:   Tue Sep 29 10:10:49 2020 +0800

net: phy: realtek: fix rtl8211e rx/tx delay config

It was backported to v5.8 as b9f0dcfbfc07719be7cc732cda4e609280704605

The commit log in question is a bit vague, as it does not explain what
is wrong with the commit it aims to fix, or what the changes are meant
to achieve.

Since it breaks h/w in the field, can we please revert it? (and
backport the revert?)

Regards,
Ard.