Hi Andrew, On 23.11.23 20:04, Andrew Lunn wrote: >> 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. > what I meant by no interrupt generation was not even physical interrupt generation i.e. the signal does not toggle in suspend-to-RAM, but it does during normal operation. >> 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 Thank you for your feedback, I will analyze the clocks carefully. Primarily I would like to know if my approach makes sense in the first place even if there is no clock dependency. Two dwmacs (realtek and intel) make use of the USE_PHY_WOL flag, but I could not find any dts where the mac-wol property is used to check if the MAC power source is off in suspend. Best regards, Javier Carrasco
