linux-kernel - Re: [PATCH net-next v2] net: dsa: mv88e6xxx: Add erratum 3.14 for 88E6390X and 88E6190X

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Date:   Wed, 19 Jul 2023 11:10:24 +0200
From:   Ante Knezic <ante.knezic@...mholz.de>
To:     <andrew@...n.ch>
CC:     <ante.knezic@...mholz.de>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <f.fainelli@...il.com>, <kuba@...nel.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <olteanv@...il.com>, <pabeni@...hat.com>
Subject: Re: [PATCH net-next v2] net: dsa: mv88e6xxx: Add erratum 3.14 for 88E6390X and 88E6190X

> > I don't think so. The erratum from the patch needs to be applied on each
> > SERDES reconfiguration or reset. For example, when replugging different 
> > SFPs (sgmii - 10g - sgmii interface). Erratum 4_6 is done only once? 
> > My guess is to put it in mv88e639x_sgmii_pcs_post_config but still I 
> > need the device product number
> 
> You might be able to read the product number from the ID registers of
> the SERDES, registers 2 and 3 ? That is kind of cleaner. It is the
> SERDES which needs the workaround, so look at the SERDES ID ...
> 
> > maybe embedding a pointer to the 
> > mv88e6xxx_chip chip inside the mv88e639x_pcs struct would be the cleanest way.
>  
>  That would also work.

Correct me if I am wrong but I think we still need the chip ptr as pcs interface
provides access only to SERDES registers. If you are refering to "PHY IDENTIFIER"
registers (Page 0, Register 2,3), we need something like mv88e6xxx_port_read
unless we want to do some direct mdio magic?