linux-kernel - Re: [PATCH net-next 1/3] net: phy: Let drivers check Wake-on-LAN status

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Date:   Mon, 8 May 2023 21:02:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Doug Berger <opendmb@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Frank <Frank.Sae@...or-comm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] net: phy: Let drivers check Wake-on-LAN
 status

On Mon, May 08, 2023 at 11:43:07AM -0700, Florian Fainelli wrote:
> A few PHY drivers are currently attempting to not suspend the PHY when
> Wake-on-LAN is enabled, however that code is not currently executing at
> all due to an early check in phy_suspend().
> 
> This prevents PHY drivers from making an appropriate decisions and put
> the hardware into a low power state if desired.
> 
> In order to allow the PHY framework to always call into the PHY driver's
> ->suspend routine whether Wake-on-LAN is enabled or not, provide a
> phydev::wol_enabled boolean that tracks whether the PHY or the attached
> MAC has Wake-on-LAN enabled.
> 
> If phydev::wol_enabled then the PHY shall not prevent its own
> Wake-on-LAN detection logic from working and shall not prevent the
> Ethernet MAC from receiving packets for matching.

Hi Florian

Did you look at using late_suspend for this? Then there would not be
any need to change all these drivers which are happy as they are.

It actually looks like late_suspend is what you want anyway, when you
say you want to turn the matching hardware on as late as possible.

    Andrew