DART-MX8M suspend: Difference between revisions
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{{PageHeader|Suspend to RAM}} | <!-- Set release according to "release" parameter in URL and use RELEASE_MORTY_V1.0_DART-MX8M as default | ||
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--> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM|RELEASE_MORTY_V1.0_DART-MX8M}}}} <!-- | |||
--> {{PageHeader|{{#var:HARDWARE_NAME}} Suspend to RAM}}{{DocImage|category1=Yocto|category2=DART-MX8M|category3=DART-MX8M-MINI}} | |||
= 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.<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 execute the following command: | ||
<pre> | <pre> | ||
# pm-suspend | |||
</pre> | </pre> | ||
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}; | }; | ||
- Pressing the capacitive touch which has the | - Pressing the capacitive touch which has the "wakeup-source" property set in its device tree node, e.g.: | ||
ft5x06_ts: ft5x06_ts@38 { | ft5x06_ts: ft5x06_ts@38 { | ||
Revision as of 08:56, 28 February 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 execute the following command:
# 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 "wakeup-source" 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 = <&gpio4 6 GPIO_ACTIVE_LOW>;
linux,code = <KEY_BACK>;
wakeup-source;
};
};
- Pressing the capacitive touch which has the "wakeup-source" property set in its device tree node, e.g.:
ft5x06_ts: ft5x06_ts@38 {
status = "disabled";
compatible = "edt,edt-ft5x06";
reg = <0x38>;
reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_touch>;
interrupt-parent = <&gpio1>;
interrupts = <14 0>;
touchscreen-size-x = <800>;
touchscreen-size-y = <480>;
touchscreen-inverted-x;
touchscreen-inverted-y;
wakeup-source;
};
Measuring SOM current consumption in suspend
To measure SOM current consumption remove resistor R15 and connect ampere meter instead.
It is recommended to boot from eMMC to get accurate measurement.