On 31/03/2021 08:43, Joakim Zhang wrote: ... >>>>>>> You mean one of your boards? Does other boards with STMMAC can >>>>>>> work >>>>>> fine? >>>>>> >>>>>> We have two devices with the STMMAC and one works OK and the other >>>> fails. >>>>>> They are different generation of device and so there could be some >>>>>> architectural differences which is causing this to only be seen on one >> device. >>>>> It's really strange, but I also don't know what architectural >>>>> differences could >>>> affect this. Sorry. >> >> >> I realised that for the board which fails after this change is made, it has the >> IOMMU enabled. The other board does not at the moment (although work is in >> progress to enable). If I add 'iommu.passthrough=1' to cmdline for the failing >> board, then it works again. So in my case, the problem is linked to the IOMMU >> being enabled. >> >> Does you platform enable the IOMMU? > > Hi Jon, > > There is no IOMMU hardware available on our boards. But why IOMMU would affect it during suspend/resume, and no problem in normal mode? I am not sure either and I don't see anything obvious. Guiseppe, Alexandre, Jose, do you see anything that is wrong with Joakim's change 9c63faaa931e? This is completely breaking resume from suspend on one of our boards and I would like to get your inputs? Thanks Jon -- nvpublic
