I tried with the low power mode example for imx7 as below:
When m4 enters Stop mode, set cortex-A7 with linux to go to low power mode with “echo mem>/sys/power/state”. So the system enter deep sleep mode but when resume with trigger, m4 low power mode stop working i.e it doesn’t enter stop/wait mode again.
Probably something in suspend/resume of linux on A7 has changed m4 low power mode. Please help me with the root cause of this issue.