netdev - Re: [PATCH] net: stmmac: fix MAC not working when system resume back with WoL enabled

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Date:   Mon, 6 Sep 2021 15:23:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Joakim Zhang <qiangqing.zhang@....com>,
        Vladimir Oltean <olteanv@...il.com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] net: stmmac: fix MAC not working when system resume back
 with WoL enabled

> We do have the ability to place the link into the slowest mutually
> supported speed via phy(link)?_speed_down(). This has the advantage of
> reducing the power used to keep the link active while in suspend (which
> is its primary purpose) but also reduces the possible link modes that
> could be autonegotiated with the partner.
> 
> I think I'd suggest to Andrew that phy_speed_down() should only
> advertise one capability, not "everything we support below the minimum
> mutually supported capability" - that way, if a link change is attempted
> on the partner while the system is suspended, the link will not come up
> and its obvious it isn't going to work.

Yes, that sounds reasonable.

> I think this is an issue for a separate patch set.

Yes, i would say a change like that is net-next material.

     Andrew