netdev - Re: [PATCH] net: phy: Don't disable irqs on shutdown if WoL is enabled

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Message-ID: <ZNOivVJ+G/sRiwai@shell.armlinux.org.uk>
Date: Wed, 9 Aug 2023 15:29:17 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Ioana Ciornei <ioana.ciornei@....com>
Cc: Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Ioana Ciornei <ciorneiioana@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandru Ardelean <alexandru.ardelean@...log.com>,
	Andre Edich <andre.edich@...rochip.com>,
	Antoine Tenart <atenart@...nel.org>,
	Baruch Siach <baruch@...s.co.il>,
	Christophe Leroy <christophe.leroy@....fr>,
	Divya Koppera <Divya.Koppera@...rochip.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Jerome Brunet <jbrunet@...libre.com>,
	Kavya Sree Kotagiri <kavyasree.kotagiri@...rochip.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Marco Felsch <m.felsch@...gutronix.de>, Marek Vasut <marex@...x.de>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Mathias Kresin <dev@...sin.me>, Maxim Kochetkov <fido_max@...ox.ru>,
	Michael Walle <michael@...le.cc>,
	Neil Armstrong <narmstrong@...libre.com>,
	Nisar Sayed <Nisar.Sayed@...rochip.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Philippe Schenker <philippe.schenker@...adex.com>,
	Willy Liu <willy.liu@...ltek.com>,
	Yuiko Oshino <yuiko.oshino@...rochip.com>
Subject: Re: [PATCH] net: phy: Don't disable irqs on shutdown if WoL is
 enabled

On Wed, Aug 09, 2023 at 05:21:55PM +0300, Ioana Ciornei wrote:
> That's a perfect summary of the problem that I was trying to fix.
> 
> The board in question is a LS1021ATSN which has two AR8031 PHYs that
> share an interrupt line. In case only one of the PHYs is probed and
> there are pending interrupts on the PHY#2 an IRQ storm will happen
> since there is no entity to clear the interrupt from PHY#2's registers.
> PHY#1's driver will get stuck in .handle_interrupt() indefinitely.

So I have two further questions:
1. Is WoL able to be supported on this hardware?
2. AR8031 has a seperate WOL_INT signal that can be used to wake up the
   system. Is this used in the hardware design?

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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