linux-kernel - Re: [PATCH v2] net: dsa: mv88e6xxx: Fix port_hidden_wait to account for port_base

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Message-ID: <YmWkgkILCrBP5hRG@lunn.ch>
Date:   Sun, 24 Apr 2022 21:26:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Nathan Rossi <nathan@...hanrossi.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Behun <kabel@...nel.org>,
        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 v2] net: dsa: mv88e6xxx: Fix port_hidden_wait to account
 for port_base_addr

On Sun, Apr 24, 2022 at 03:31:43PM +0000, Nathan Rossi wrote:
> The other port_hidden functions rely on the port_read/port_write
> functions to access the hidden control port. These functions apply the
> offset for port_base_addr where applicable. Update port_hidden_wait to
> use the port_wait_bit so that port_base_addr offsets are accounted for
> when waiting for the busy bit to change.
> 
> Without the offset the port_hidden_wait function would timeout on
> devices that have a non-zero port_base_addr (e.g. MV88E6141), however
> devices that have a zero port_base_addr would operate correctly (e.g.
> MV88E6390).
> 
> Fixes: ea89098ef9a5 ("net: dsa: mv88x6xxx: mv88e6390 errata")

That is further back than needed. And due to the code moving around
and getting renamed, you are added extra burden on those doing the
back port for no actual gain.

Please verify what i suggested, 609070133aff1 is better and then
repost.

	Thanks
		Andrew