linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: Skip cmode writable for mv88e6*41 if unchanged

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Message-ID: <20220423152523.1f38e2d8@thinkpad>
Date:   Sat, 23 Apr 2022 15:25:23 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Nathan Rossi <nathan@...hanrossi.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] net: dsa: mv88e6xxx: Skip cmode writable for mv88e6*41
 if unchanged

On Sat, 23 Apr 2022 13:20:35 +0000
Nathan Rossi <nathan@...hanrossi.com> wrote:

> The mv88e6341_port_set_cmode function always calls the set writable
> regardless of whether the current cmode is different from the desired
> cmode. This is problematic for specific configurations of the mv88e6341
> and mv88e6141 (in single chip adddressing mode?) where the hidden
> registers are not accessible.

I don't have a problem with skipping setting cmode writable if cmode is
not being changed. But hidden registers should be accessible regardless
of whether you are using single chip addressing mode or not. You need
to find why it isn't working for you, this is a bug.

Marek