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How to enable LPSR with MCIMX7SABRE EVK board?

Question asked by Wenhann Tsai on Apr 24, 2018
Latest reply on Apr 24, 2018 by Wenhann Tsai

How to enable LPSR correctly on MCIMX7SABRE???

Power consumption is critical in our product.

 

>NXP or other standard reference board used

I am use a MCIMX7SABRE EVB.

 

>Kernel version and/or BSP release used

Testing with official Android image: android_N7.1.2_2.0.0_image_7dsabresd

 

>Any additional software/application or hardware used

No.

 

>Hardware or software changes made from standard platform

No.

 

>Expected and observed behavior

System current should be low after enter supend.

system active--> power supply is about 340mA 5V

system suspend--> power supply is about 270mA 5V.

Expected suspend current should below 10mA.

 

>Steps to reproduce

Boot into system.

Run below command from UART and USB is not connect.

echo mem > /sys/power/state

 

Try to apply below thread patch to modify imx7d-sdb.dts

Suspend current is drop to 173mA 5V but cannot resume (it looks like crash and system didn't have any response.)

How to Resume from LPSR mode on imx7D sabre 

 

>Frequency of reproducibility (always, usually, sometimes)

Always.

 

>Display type and resolution (for video/graphic/display issues

No display.

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