Re: [PATCH v12 1/1] serial: core: Start managing serial controllers to enable runtime PM

[Tony Lindgren]

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