netdev - Re: [PATCH v1 net] net: dsa: mv88x6xxx: mv88e6390 errata

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Message-ID: <20190109185555.GE16016@lunn.ch>
Date:   Wed, 9 Jan 2019 19:55:55 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxim Uvarov <muvarov@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH v1 net] net: dsa: mv88x6xxx: mv88e6390 errata

On Wed, Jan 09, 2019 at 09:43:52PM +0300, Maxim Uvarov wrote:
> Is this errata documented somewhere? What happends without that magic
> wirtes? Software reset doen't clear registers into initial state?

Hi Max

Marvell have documentation for it. From what i understand, if the PHY
establishes link when there are already frames going out the port, the
port might block the frames.

My testing has shown that a software reset does not clear these
registers.

	Andrew