linux-kernel - Re: [PATCH net v2] net: dsa: mv88e6xxx: Reset mv88e6393x force WD event bit

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Date:   Fri, 31 Mar 2023 14:27:48 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Gustav Ekelund <gustav.ekelund@...s.com>
Cc:     marek.behun@....cz, Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...s.com,
        Gustav Ekelund <gustaek@...s.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: dsa: mv88e6xxx: Reset mv88e6393x force WD
 event bit

On Fri, Mar 31, 2023 at 10:40:13AM +0200, Gustav Ekelund wrote:
> From: Gustav Ekelund <gustaek@...s.com>
> 
> The force watchdog event bit is not cleared during SW reset in the
> mv88e6393x switch. This is a different behavior compared to mv886390 which
> clears the force WD event bit as advertised. This causes a force WD event
> to be handled over and over again as the SW reset following the event never
> clears the force WD event bit.
> 
> Explicitly clear the watchdog event register to 0 in irq_action when
> handling an event to prevent the switch from sending continuous interrupts.
> Marvell aren't aware of any other stuck bits apart from the force WD
> bit.
> 
> Signed-off-by: Gustav Ekelund <gustaek@...s.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew