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

[Florian Fainelli]

On 9/5/23 02:33, Lukasz Majewski wrote:
> The KSZ9477 errata points out (in 'Module 4') the link up/down problems
> when EEE (Energy Efficient Ethernet) is enabled in the device to which
> the KSZ9477 tries to auto negotiate.
>
> The suggested workaround is to clear advertisement of EEE for PHYs in
> this chip driver.
>
> To avoid regressions with other switch ICs the new MICREL_NO_EEE flag
> has been introduced.
>
> Moreover, the in-register disablement of MMD_DEVICE_ID_EEE_ADV.MMD_EEE_ADV
> MMD register is removed, as this code is both; now executed too late
> (after previous rework of the PHY and DSA for KSZ switches) and not
> required as setting all members of eee_broken_modes bit field prevents
> the KSZ9477 from advertising EEE.
>
> Fixes: 69d3b36ca045 ("net: dsa: microchip: enable EEE support") (for KSZ9477).
>
> Signed-off-by: Lukasz Majewski <lukma@xxxxxxx>
> Tested-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> Confirmed disabled EEE with oscilloscope.
> Reviewed-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>

Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
--
Florian