netdev - RE: [PATCH net-next V1 3/4] net: stmmac: Reconfigure the PHY WOL settings in stmmac

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Date:   Mon, 28 Jun 2021 07:54:14 +0000
From:   "Voon, Weifeng" <weifeng.voon@...el.com>
To:     Russell King <linux@...linux.org.uk>
CC:     Andrew Lunn <andrew@...n.ch>,
        "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>,
        "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.
> >
> > Sorry for the confusion. But I would like to clarify the I should use
> > the term of "WOL event status" rather than "WOL interrupt status".
> > For interrupt mode, clearing the "WOL interrupt status" register will
> > auto clear the "WOL event status".
> > For polling mode, the phy driver can manually clear the "WOL event
> > status" by setting 1 to "Clear WOL Status" bit.
> 
> If WOL raises an interrupt signal from the PHY, but the PHY interrupt
> signal is not wired, how does the wakeup happen? What is the PHY interrupt
> wired to?

The PHY WOL event signal is wired directly to the PMC. The PMC will detect 
the triggered WOL event signal and wakeup the system.

Weifeng