netdev - Re: [PATCH net 2/3] net: mediatek: sgmii: autonegotiation is required

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Date:   Fri, 20 Jan 2023 08:56:57 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Daniel Golle <daniel@...rotopia.org>,
        Alexander Couzens <lynxis@...0.eu>
Subject: Re: [PATCH net 2/3] net: mediatek: sgmii: autonegotiation is required

"Russell King (Oracle)" <linux@...linux.org.uk> writes:

> If you have 'managed = "in-band-status";' in your DT, that will set
> "mode" to be MLO_AN_INBAND, and phylink_autoneg_inband(mode) will be
> true - which should result in the link being programmed for in-band
> mode. You should also find that mtk_pcs_get_state() gets called.
>
> Hmm, it looks like setting ss->pcs[i].pcs.poll to true was missed
> when support for inband was properly added, so that might be the
> issue there - as the mtk ethernet driver doesn't make use of
> phylink_mac_change().

OK, this doesn't just work as-is either. But I guess that's something
else.  Will try to debug some more.

But I wonder:  Why would I want to use "in-band-status" here? Is that
the preferred mode?  Probably stupid question.  But shouldn't we also
make this link work without it, whatever that takes?

Note that I don't have to care about unknown phys.  No SFP cage on this
board.


Bjørn