linux-kernel - Re: [PATCH 2/2] net: phy: Provide Module 4 KSZ9477 errata (DS80000754C)

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Message-ID: <ZO9Uf5DjJ6Kf6uvh@shell.armlinux.org.uk>
Date:   Wed, 30 Aug 2023 15:38:55 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Lukasz Majewski <lukma@...x.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Andrew Lunn <andrew@...n.ch>, davem@...emloft.net,
        Woojung Huh <woojung.huh@...rochip.com>,
        Vladimir Oltean <olteanv@...il.com>, Tristram.Ha@...rochip.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, UNGLinuxDriver@...rochip.com,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: phy: Provide Module 4 KSZ9477 errata
 (DS80000754C)

On Wed, Aug 30, 2023 at 04:26:50PM +0200, Oleksij Rempel wrote:
> @Lukasz,
> 
> can you please try to set eee_broken_modes to all-ones. Somewhat like
> this:
> ksz9477_config_init()
> ...
>    ...quirks...
> 
>    if (phydev->dev_flages & .. NO_EEE...)
>        phydev->eee_broken_modes = -1;

That's fine in config_init().

>    err = genphy_restart_aneg(phydev);

That isn't necessary, and in any case, calling it will just cause the
AN enable and AN restart bits in BMCR to be set, nothing will be
reprogrammed.

However, at a later point, when the PHY is started (by phy_start()
being called) the state will be set to PHY_UP, and the state machine
triggered. That sets needs_aneg which will then call phy_start_aneg().

That then goes on to call phy_config_aneg(), which will either call
the driver specific config_aneg() function, or one of the two generic
genphy.*config_aneg() functions. These will then program the EEE
advertisement.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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