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Resume from standby doesn't work for UART4 on i.mx7D Sabre board

Question asked by roberto pozzi on Dec 6, 2017
Latest reply on Dec 6, 2017 by igorpadykov

I have an imx7D Sabre board on which I have actived the UART4 ( available on mikro BUS).

The UART4 works perfectly ( I can send/receive data to a PC)

Before sending the board to standby I enable the wakeup from UART4 sending by the console the following comand:

echo enabled > /sys/bus/platform/drivers/imx-uart/30a70000.serial/tty/ttymxc4/power/wakeup

then I put the board in standby with the command:

echo standby > /sys/power/state

Sending then some bytes to the UART4, the  Sabre board doesn't wake up.

Instead the wake up works fine from the console.

Console Enable wakeup comand used:

echo enabled > /sys/bus/platform/drivers/imx-uart/30860000.serial/tty/ttymxc0/power/wakeup

Have I forgotten some  further setting to enable the Wakeup from standby for the  UART4?

Roberto Pozzi