linux-kernel - Re: [PATCH net-next v3] net: dsa: mv88e6xxx: Prevent suspend to RAM

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Date:   Wed, 06 Feb 2019 17:16:57 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     miquel.raynal@...tlin.com
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com,
        antoine.tenart@...tlin.com, maxime.chevallier@...tlin.com,
        nadavh@...vell.com
Subject: Re: [PATCH net-next v3] net: dsa: mv88e6xxx: Prevent suspend to RAM

From: Miquel Raynal <miquel.raynal@...tlin.com>
Date: Tue,  5 Feb 2019 12:07:28 +0100

> On one hand, the mv88e6xxx driver has a work queue called in loop
> which will attempt register accesses after MDIO bus suspension, that
> entirely freezes the platform during suspend.
> 
> On the other hand, the DSA core is not ready yet to support suspend to
> RAM operation because so far there is no way to recover reliably the
> switch configuration.
> 
> To avoid the kernel to freeze when suspending with a switch driven by
> the mv88e6xxx driver, we choose to prevent the driver suspension and
> in the same way, the whole platform.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>

Applied to net-next, thanks.