netdev - Re: phylink / mv8e6xxx and SGMII aneg not working, link doesn't come up

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Date:   Thu, 28 Feb 2019 00:51:54 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: phylink / mv8e6xxx and SGMII aneg not working, link doesn't come
 up

On 28.02.2019 00:19, Andrew Lunn wrote:
>> >From what you've described, it sounds like what you actually have is:
>>
>> 	MAC <---> Serdes PHY <---> PHY
>>
>> The Serdes PHY receives the SGMII in-band negotiation from the external
>> PHY, but there is no propagation of the status from the serdes PHY to
>> the MAC.
> 
> Yes, that is a good description. So far, we have not yet got the MAC
> to read the speed and duplex from the SERDES to configure itself. In
> theory it should be able to, it is all in the same device.
> 
> It might be that once the SERDES interrupts saying it has link we need
> to program the MAC with the result of the in-band signalling. in-band
> then seems a bit pointless. Or we are missing some configuration
> somewhere to tell the MAC to use the in-band signalling result from
> the SERDES.
> 
I'll play a little with it and see whether I get it working.
As a fallback we have the option to go with out-of-band.

>      Andrew
> 
> 
Heiner