Hello again Peter, On Fri, Mar 4, 2022 at 6:47 AM Peter Geis <pgwipeout@xxxxxxxxx> wrote: > Transitions anywhere from the default 800mhz cause a lock. > > I'm digging deeper, but I'm hoping you can answer some questions in > the meantime: > 1. Does this require something from firmware that isn't available on > Mainline ATF? (AKA special firmware to the Chromebook line) > 2. If not, do you have any recommendations off the top of your head? I may have a better answer for you now. In the intervening time period, I've discovered a potentially-relevant bug, involving interactions between the kernel power-domain driver and ATF. See this series for my current fixes: https://lore.kernel.org/linux-rockchip/20220406014842.2771799-1-briannorris@xxxxxxxxxxxx/ [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller resources between ATF and kernel If that happens to help you (it may help, for instance, if your system was toggling NPLL off/on like mine was; it also may help if you're hitting a race on PMU_BUS_IDLE_REQ like noticed in patch 1), I'd love your feedback there. It's still possible your problems are completely unrelated though. Regards, Brian