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

[Andrew Lunn <andrew@lunn.ch>]

> 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