From: Alexander Kochetkov <al.koc...@gmail.com>
Date: Thu, 20 Apr 2017 14:00:04 +0300
> The Ethernet link on an interrupt driven PHY was not coming up if the Ethernet
> cable was plugged before the Ethernet interface was brought up.
>
> The patch trigger PHY state machine to update link state if PHY was requested
> to
> do auto-negotiation and auto-negotiation complete flag already set.
>
> During power-up cycle the PHY do auto-negotiation, generate interrupt and set
> auto-negotiation complete flag. Interrupt is handled by PHY state machine but
> doesn't update link state because PHY is in PHY_READY state. After some time
> MAC bring up, start and request PHY to do auto-negotiation. If there are no
> new
> settings to advertise genphy_config_aneg() doesn't start PHY auto-negotiation.
> PHY continue to stay in auto-negotiation complete state and doesn't fire
> interrupt. At the same time PHY state machine expect that PHY started
> auto-negotiation and is waiting for interrupt from PHY and it won't get it.
>
> Signed-off-by: Alexander Kochetkov <al.koc...@gmail.com>
> Cc: stable <sta...@vger.kernel.org> # v4.9+
So... what are we doing here?
My understanding is that this should fix the same problem that commit
99f81afc139c6edd14d77a91ee91685a414a1c66 ("phy: micrel: Disable auto
negotiation on startup") fixed and that this micrel commit should thus
be reverted to improve MAC startup times which regressed.
Florian, any guidance?
