netdev - Re: [BUG] mv88e6xxx: tx regression in v5.3

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Message-ID: <20191219090438.4jnfd3fqjc2pmivw@sapphire.tkos.co.il>
Date:   Thu, 19 Dec 2019 11:04:38 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Marek Behún <marek.behun@....cz>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        netdev@...r.kernel.org,
        Denis Odintsov <d.odintsov@...viangames.com>,
        Hubert Feurstein <h.feurstein@...il.com>
Subject: Re: [BUG] mv88e6xxx: tx regression in v5.3

Hi Marek,

On Wed, Dec 18, 2019 at 03:30:35PM +0100, Marek Behún wrote:
> On Sun, 15 Dec 2019 12:13:25 +0200
> Baruch Siach <baruch@...s.co.il> wrote:
> 
> > Thanks. That is enough to fix the phylink issue triggered by commit
> > 7fb5a711545 ("net: dsa: mv88e6xxx: drop adjust_link to enabled
> > phylink").
> > 
> > The Clearfog GT-8K DT has also this on the cpu side:
> > 
> > &cp1_eth2 {
> >         status = "okay";
> >         phy-mode = "2500base-x";
> >         phys = <&cp1_comphy5 2>;
> >         fixed-link {
> >                 speed = <2500>;
> >                 full-duplex;
> >         };
> > };
> > 
> > Should I drop fixed-link here as well?
> 
> I would think yes. phy-mode = 2500base-x should already force 2500mbps,
> the fixed-link should be irrelevant. Whether this is truly the case I
> do not know, but on Turris Mox I do not use fixed-link with these.

It doesn't work here without fixed-link. The link state remains down.

baruch

> > The call to mv88e6341_port_set_cmode() introduced in commit
> > 7a3007d22e8 ("net: dsa: mv88e6xxx: fully support SERDES on Topaz
> > family") still breaks port 5 (cpu) configuration. When called, its
> > mode parameter is set to PHY_INTERFACE_MODE_2500BASEX (19).
> > 
> > Any idea?
> 
> I shall look into this. On Turris Mox this works, so I will have to do
> some experiments.

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
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