linux-kernel - Re: [net v4] net: phy: Provide Module 4 KSZ9477 errata (DS80000754C)

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Message-ID: <ZPge1LuqIRk9N2P0@shell.armlinux.org.uk>
Date:   Wed, 6 Sep 2023 07:40:20 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Lukasz Majewski <lukma@...x.de>, Tristram.Ha@...rochip.com,
        Eric Dumazet <edumazet@...gle.com>,
        Andrew Lunn <andrew@...n.ch>, davem@...emloft.net,
        Woojung Huh <woojung.huh@...rochip.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, UNGLinuxDriver@...rochip.com,
        Heiner Kallweit <hkallweit1@...il.com>,
        Michael Walle <michael@...le.cc>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net v4] net: phy: Provide Module 4 KSZ9477 errata (DS80000754C)

On Wed, Sep 06, 2023 at 01:29:45AM +0300, Vladimir Oltean wrote:
> It's probably not causing practical harm, but currently, we tell
> genphy_config_eee_advert() to include reserved bits of the MMD EEE
> Advertising Register (MMD 0x07 : 0x3C) into its modification mask.

Ah, you've fallen into that trap. genphy_config_eee_advert() is
obsolete and redundant. Nothing calls it, and it should be removed.

What's actually used is genphy_c45_an_config_eee_aneg() and
genphy_c45_write_eee_adv(). The latter will not modify any reserved
bits in the register.

-- 
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