i.MX 6ULL Low power modes

[ranjithkumar_kv]

Hi,

We are planning to use i.MX 6ULL processor in our project. We wish to know what are the low power modes available for 6ULL processor like mem and freeze available for i.MX 8M Mini processor. So please help us in providing the available low power modes.

Thanks in advance.

[AldoG]

Hello,

 In our BSP i.MX 6 family support standby mode and dormant (mem) mode, freeze is not supported.

Hope this helps,

Regards,

Aldo.

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[ranjithkumar_kv]

Hi Aldo,

Thanks for your quick reply. And what string must be passed to the /sys/power/state file to make the processor to enter the standby mode and can you also explain what will be happening in standby mode?

Thanks,

Ranjith

[AldoG · Accepted solution]

Hello

In reference from this other thread:

https://community.nxp.com/message/328922

Does stand-by mode means imx6' stop mode?

Both standby and mem mode, i.MX6 will enter stop mode, the different of standby and mem mode are: in mem mode, ARM core's power will be gated and DDR IO will be floated, mem mode is the most power saving mode, named deep sleep mode(DSM).

When the imx6-linux enter the suspend,which mode does the imx6 enter?

You can make linux enter suspend by "echo mem > /sys/power/state", or "echo standby > /sys/power/state", to wake up system from suspend, you can use RTC wake up or power key. For example, "echo +3 > /sys/class/rtc/rtc0/wakealarm", system will auto resume 3 seconds after suspend.

Hope this helps,

Regards,

Aldo.

[ranjithkumar_kv]

Hi Aldo,

Thanks for your reply. The information given by you will be very helpful to us.

Regards

Ranjith