We have a iMX6Q customized board running 3.14.28 FSL Linux kernel. I am trying to put the system in LPM mode. through following steps.
echo enabled > /sys/bus/platform/drivers/imx-uart/2020000.serial/tty/ttymxc0/power/wakeup
echo standby > /sys/power/state
The kernel is compiled with CONFIG_SUSPEND option.
Most of the time the iMX6Q hang in during disabling not boot CPU and then watchdog reset happens.
[ 182.529533] Disabling non-boot CPUs ...
Very rarely iMX6Q enters suspend mode. In this case, wakeup also not happening. Only power recycle is required to bring up the board.
Let me know any addition patch or configuration required for suspend/wakeup for linux kernel 3.14.28