I have Linux based development board on which DWC3 USB controller driver is present. I have implemented Link Power Management(L2 state) in the usb driver. Ubuntu is the host which on which my development board is connected via USB.
I need to perform regression testing of USB suspend-resume by using shell script. I have managed to write some portion of it,
**usb suspend-resume.sh** path=1-10 echo auto > /sys/bus/usb/drivers/usb/$path/power/control echo 10 > /sys/bus/usb/drivers/usb/$path/power/autosuspend sleep 10 iteration="10" count="0" while [ $count -lt $iteration ] do rs=$(cat /sys/bus/usb/drivers/usb/$path/power/runtime_status) if [ "$rs" = "suspended" ] then echo usb is suspended sleep 5 count=$((count+1)) fi done
Devices on Ubuntu 14.04: /dev/ttyACM0 /dev/ttyACM1 /dev/ttyACM2 /dev/ttyACM3
The above script could perform only suspend(every 10s) but i'm not able to proceed how to resume the device.