review use of cpsid in aarch32 / CONFIG_PM

[pabigot]

My attention has been drawn to https:/zephyrproject-rtos/zephyr/blob/master/arch/arm/core/aarch32/isr_wrapper.S#L111 where enabling power management on Cortex M devices causes interrupts to be disabled for a sequence of operations in the ISR wrapper including the invocation of z_pm_save_idle_exit(). There is concern that this impacts use of ZLI by Bluetooth.

Need to determine whether this configuration actually interferes with ZLIs, and independently whether this matters given that entry to a non-runtime power state while Bluetooth is running may be inappropriate.

I don't have the capacity to follow up, but want to bring this to notice so that if all interrupts do get disabled, we are still aware of that for how long would it be and what the latencies on ISRs be.

Relates to #8109

[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.