Re: [PATCH v2] net: phy: realtek: Add support for RTL9000AA/AN

On Sun, Jan 10, 2021 at 05:52:21PM +0900, Yuusuke Ashizuka wrote:

RTL9000AA/AN as 100BASE-T1 is following:
- 100 Mbps
- Full duplex
- Link Status Change Interrupt

Signed-off-by: Yuusuke Ashizuka <redacted>
Signed-off-by: Torii Kenichi <redacted>

Not a review comment on your patch, but, we really need to do
something with the way phylib handles configuration changes - we
have the current situation where config_aneg() _will_ get called
for PHYs like this that do not support autonegotiation if userspace
attempts to enable autoneg - there is nothing in
phy_ethtool_ksettings_set() that prevents this.

Returning an error from config_aneg() achieves nothing, and
resetting the settings in config_init() also does nothing to avoid
autonegotiation being enabled.

I think we need phy_ethtool_ksettings_set() to check whether
ETHTOOL_LINK_MODE_Autoneg_BIT is set in phydev->supported before
allowing the AUTONEG_ENABLE case.

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