linux-kernel - Re: [PATCH net-next 1/4] dt-bindings: net: document st,phy-wol property

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Message-ID: <dea45ecd-c183-426b-abae-12220a2b6827@lunn.ch>
Date: Wed, 23 Jul 2025 16:02:04 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Christophe Roullier <christophe.roullier@...s.st.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Simon Horman <horms@...nel.org>,
	Tristram Ha <Tristram.Ha@...rochip.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] dt-bindings: net: document st,phy-wol
 property

> I've just read a bit more of the RTL8211F datasheet, and looked at the
> code, and I'm now wondering whether WoL has even been tested with
> RTL8211F. What I'm about to state doesn't negate anything I've said
> in my previous reply.
> 
> 
> So, the RTL8211F doesn't have a separate PMEB pin. It has a pin that
> is shared between "interrupt" and "PMEB".
> 
> Register 22, page 0xd40, bit 5 determines whether this pin is used for
> PMEB (in which case it is pulsed on wake-up) or whether it is used as
> an interrupt. It's one or the other function, but can't be both.

This sounds familiar.

> rtl8211f_set_wol() manipulates this bit depending on whether
> WAKE_MAGIC is enabled or not.
> 
> The effect of this is...
> 
> If we're using PHY interrupts from the RTL8211F, and then userspace
> configures magic packet WoL on the PHY, then we reconfigure the
> interrupt pin to become a wakeup pin, disabling the interrupt
> function - we no longer receive interrupts from the RTL8211F !!!!!!!

Ah. I thought that switch happened in the PHY driver suspend() call,
and it gets restored in the resume() call? That does required that
suspend/resume actually gets called despite WoL being enabled...

	Andrew