Re: [PATCH RFC WIP 0/2] net: stmmac: dwmac-rk: add support for PHY wake on LAN

[Andrew Lunn]

> Setting the USE_PHY_WOL flag configures the PHY as expected (its driver
> writes the MAC address and the interrupt configuration into the PHY
> registers) and an interrupt is generated with every magic packet,
> but only during normal operation i.e. there is no interrupt generation
> in suspend-to-RAM.

Do you have a logic analyser connected? Can you see if the PHY is
toggling its output pin? We then know if its a PHY problem, or a SoC
problem.

> A (probably naive) wakeup-source property in the dt node does not help.
> So now I am trying to find out why the PHY does not react in suspend and
> why its interrupt is ignored in freeze mode, but I might be overlooking
> some other important point to consider.

What is the clock setup? Sometimes the MAC gives a clock to the
PHY. Sometimes the PHY gives a lock to the MAC. If its MAC->PHY, and
this clock is getting turned off, that might cause a problem.

     Andrew