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i.MX 8M Mini suspend mode issue

Question asked by Jinlong Bai on Mar 19, 2020
Latest reply on Mar 19, 2020 by igorpadykov

We have an imx8m mini development board with pca9450(PMIC) and  DDR3L. We use the following command to put it into suspend mode, but we cannot wake it up through the serial port(Debug port).

echo enabled > /sys/class/tty/ttymxc1/power/wakeup

echo mem > /sys/power/state

In suspend mode, the VDD_ARM  voltage is 0V, NVCC_DRAM is 1.35V, VDD_SOC is 0.8V,VDD_GPU is 0.75V.

After entering any characters into the serial port, the VDD_ARM  voltage is 0.9V, NVCC_DRAM is 1.35V, VDD_SOC is 0.85V,VDD_GPU is 0.95V.But the system hangs and no characters are output from the debug port.

How should we debug about resuming from suspend mode?

Is there any relevant guidance material?