linux-kernel - Re: [PATCH] net: phy: marvell: clear wol event before setting it

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Message-ID: <20180426124007.GC13467@lunn.ch>
Date:   Thu, 26 Apr 2018 14:40:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Bhadram Varka <vbhadram@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jingju Hou <Jingju.Hou@...aptics.com>
Subject: Re: [PATCH] net: phy: marvell: clear wol event before setting it

> hmm, so you want a "stick" WOL feature, I dunno whether Linux kernel
> requires WOL should be "stick".

I see two different cases:

Suspend/resume: The WoL state in the kernel is probably kept across
such a cycle. If so, you would expect another suspend/resume to also
work, without needs to reconfigure it.

Boot from powered off: If the interrupt just enables the power supply,
it is possible to wake up after a shutdown. There is no state kept, so
WoL will be disabled in the kernel. So WoL should also be disabled in
the hardware.

    Andrew