Re: [PATCH 07/14] net: axienet: Fix SGMII support

On Fri, Jan 10, 2020 at 11:54:08AM +0000, Andre Przywara wrote:

With SGMII, the MAC and the PHY can negotiate the link speed between
themselves, without the host needing to mediate between them.
Linux recognises this, and will call phylink's mac_config with the speed
member set to SPEED_UNKNOWN (-1).
Currently the axienet driver will bail out and complain about an
unsupported link speed.

Teach axienet's mac_config callback to leave the MAC's speed setting
alone if the requested speed is SPEED_UNKNOWN.

Hi Andre

Is there an interrupt when SGMII signals a change in link state? If
so, you should call phylink_mac_change().

    Andrew

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