linux-kernel - Re: [PATCH net-next V1 3/4] net: stmmac: Reconfigure the PHY WOL settings in stmmac

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Message-ID: <YNSLQpNsNhLkK8an@lunn.ch>
Date:   Thu, 24 Jun 2021 15:40:18 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Voon, Weifeng" <weifeng.voon@...el.com>
Cc:     "Ling, Pei Lee" <pei.lee.ling@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        Wong Vee Khee <vee.khee.wong@...ux.intel.com>,
        "Wong, Vee Khee" <vee.khee.wong@...el.com>,
        "Tan, Tee Min" <tee.min.tan@...el.com>,
        "Sit, Michael Wei Hong" <michael.wei.hong.sit@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next V1 3/4] net: stmmac: Reconfigure the PHY WOL
 settings in stmmac_resume()

> No, the interrupt will not be discarded. If the PHY is in interrupt mode, the
> interrupt handler will triggers and ISR will clear the WOL status bit. 
> The condition here is when the PHY is in polling mode, the PHY driver does not
> have any other mechanism to clear the WOL interrupt status bit.
> Hence, we need to go through the PHY set_wol() again. 

I would say you have a broken setup. If you are explicitly using the
interrupt as a wakeup source, you need to be servicing the
interrupt. You cannot use polled mode.

	   Andrew