Re: [PATCH RESUBMIT net-next] r8169: simplify EEE handling

[Heiner Kallweit <hkallweit1@gmail.com>]

On 02.02.2024 01:16, Andrew Lunn wrote:
>> @@ -5058,7 +5033,9 @@ static int r8169_mdio_register(struct rtl8169_private *tp)
>>  	}
>>  
>>  	tp->phydev->mac_managed_pm = true;
>> -
>> +	if (rtl_supports_eee(tp))
>> +		linkmode_copy(tp->phydev->advertising_eee,
>> +			      tp->phydev->supported_eee);
> 
> This looks odd. Does it mean something is missing on phylib?
> 
Reason is that we treat "normal" advertising and EEE advertising differently
in phylib. See this code snippet from phy_probe().

        phy_advertise_supported(phydev);
        /* Get PHY default EEE advertising modes and handle them as potentially
         * safe initial configuration.
         */
        err = genphy_c45_read_eee_adv(phydev, phydev->advertising_eee);

For EEE we don't change the initial advertising to what's supported,
but preserve the EEE advertising at the time of phy probing.
So if I want to mimic the behavior of phy_advertise_supported() for EEE,
I have to populate advertising_eee in the driver.

Alternative would be to change phy_advertise_supported(), but this may
impact systems with PHY's with EEE flaws.

> 	Andrew
Heiner