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

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Message-ID: <YTDCZN/WKlv9BsNG@lunn.ch>
Date:   Thu, 2 Sep 2021 14:24:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     Russell King <linux@...linux.org.uk>,
        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

> Emm, @andrew@...n.ch, Andrew is much familiar with FEC, and PHY maintainers,
> Could you please help put insights here if possible?

All the boards i have either have an Ethernet Switch connected to the
MAC, or a Micrel PHY. None are setup for WoL, since it is not used in
the use case of these boards.

I think you need to scatter some printk() in various places to confirm
what is going on. Where is the WoL implemented: MAC or PHY, what is
suspended or not, etc.

    Andrew