IMX suspend: Difference between revisions
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Revision as of 19:27, 20 July 2019
Suspend to RAM
This state offers significant power savings as everything in the system is put into a low-power state, except for memory, which is placed into the self-refresh mode to retain its contents.
To suspend to RAM:
# echo mem > /sys/power/state
Wake up
There are many possible ways to wake up from suspend.
A few examples:
- Pushing the ON/OFF button (when present on the board)
- Pushing a button on the board which has the boolean property "gpio-key,wakeup" set in its device tree node (under gpio_keys), e.g.:
gpio-keys { compatible = "gpio-keys"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_gpio_keys>; back { label = "Back"; gpios = <&gpio5 20 GPIO_ACTIVE_LOW>; linux,code = <KEY_BACK>; gpio-key,wakeup; }; };
- Using the RTC you can wake at a specific time (see the RTC section)
Current consumption when suspended
VAR-SOM-MX6 "L" revisions (1GB RAM)
17.2mA with a 3.7V Li-Po
Warning: Only "L" (for Low-power) revisions of VAR-SOM-MX6 can be operated at 3.7V!
DART-MX6
9mA with a 3.7V Li-Po
VAR-DART-6UL
4.5mA at 3.3V
VAR-SOM-MX7
TBD