IMX suspend: Difference between revisions

From Variscite Wiki
(Add category Debian)
 
(5 intermediate revisions by 2 users not shown)
Line 1: Line 1:
{{PageHeader|Suspend to RAM}}
{{PageHeader|Suspend to RAM}}
{{DocImage|category1=Yocto|category2=VAR-SOM-MX6}}[[Category:DART-6UL]] [[Category:VAR-SOM-MX7]]
{{DocImage|category1=Yocto|category2=Debian}}
= Suspend to RAM =
[[Category:VAR-SOM-MX6]]
[[Category:DART-6UL]]  
[[Category:VAR-SOM-MX7]]
=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.<br>
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.<br>


To suspend to RAM:
To suspend to RAM, run:
<pre>
# pm-suspend
$ echo mem > /sys/power/state
 
</pre>
=Wake up=
<br>
There are many possible ways to wake up from suspend.<br>
To wake up:<br>
A few examples:<br>
There are a few ways to wake up from suspend.<br>
- Pushing the ON/OFF button (when present on the board)<br>
For example, using the RTC you can wake at a specific time (see the RTC section).<br>
- 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.:
Another way is to push a button on the board which is set as wakeable.<br>
 
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 [[IMX_RTC|RTC section]])<br>
 


= Current consumption when suspended =
=Current consumption when suspended=
== VAR-SOM-MX6 "L" revisions (1GB RAM) ==
==VAR-SOM-MX6 "L" revisions (1GB RAM)==
17.2mA with a 3.7V Li-Po<br>
17.2mA with a 3.7V Li-Po<br>
<br>
<br>
Warning: Only "L" (for Low-power) revisions of VAR-SOM-MX6 can be operated at 3.7V!
Warning: Only "L" (for Low-power) revisions of VAR-SOM-MX6 can be operated at 3.7V!


== DART-MX6 ==
==DART-MX6==
9mA with a 3.7V Li-Po<br>
9mA with a 3.7V Li-Po<br>


== VAR-DART-6UL ==
==VAR-DART-6UL==
4.5mA at 3.3V<br>
4.5mA at 3.3V<br>


== VAR-SOM-MX7 ==
==VAR-SOM-MX7==
To be updated
Transistor Q1 should be shorted in order to measure the sleep current correctly.
Please check out the CustomBoard schematics for additional information.

Latest revision as of 19:30, 28 April 2023

Suspend to RAM

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, run:

# pm-suspend

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

Transistor Q1 should be shorted in order to measure the sleep current correctly. Please check out the CustomBoard schematics for additional information.