Customer observed that the GPIO pin voltage drops when entering Deep Sleep.

Experiments to Evaluate the Problem:

• Checked the Padconfig register before and after suspend/resume
• Changed Padconfig bit24=1 and toggled the rest of the DS bits
• Used an experimental DM Firmware to see if the Padconfig restore step is the source
• Used an experimental DM Firmware to see if IO Isolation step is the source
• Used an experimental DM Firmware that added a loop at the end of IO Isolation
• Tried RTC wake with these DM Firmwares
• Changing the ATF to an infinite while loop at the suspend finish step
• Changed ti_sci.c to add a while loop before & after the IO Isolation step
• Checked the value of GPIO IP before removing IO isolation in resume path
• Tried setting the value of GPIO IP for GPIO0_42 pin and then removing isolation

Customer E2E Threads:
[1] https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1361669/am625-gpio-output-state-in-deep-sleep

[2] https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1369205/am625-gpio-s-impedance-change-in-deepsleep-mode

[3] https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1360238/am625-peripherals-goes-into-reset-state-when-processor-goes-into-deepsleep-mode