Hi, * Maximilian Luz <luzmaximilian@xxxxxxxxx> [231003 11:57]: > A bad workaround is to disable runtime PM, e.g. via > > echo on > /sys/bus/serial-base/devices/dw-apb-uart.4:0/dw-apb-uart.4:0.0/power/control If the touchscreen controller driver(s) are using serdev they are children of the dw-apb-uart.4:0.0 and can use runtime PM calls to block the parent device from idling as necessary. The hierarchy unless changed using ignore_children. Then when the children are done, seem like dw-apb-uart driver should use force_suspend and force_resume calls in the system suspend path. Do you have some mainline kernel test case available or is this still out of tree code? Regards, Tony
