AM62 Low Power: Difference between revisions
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| am62-yocto-kirkstone-6.1.46_09.01.00.08-v1.0= | |||
{{#vardefine:TI_LOW_POWER_DOCS_LINK|https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Power_Management/pm_low_power_modes.html}} | |||
{{#vardefine:TI_WAKEUP_SOURCES_DOCS_LINK|https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Power_Management/pm_wakeup_sources.html#wakeup-sources}} | |||
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= Background = | = Background = | ||
TI's AM62 contains numerous low power modes and features. Extensive documentation on the subject can be found by consulting TI's [{{#var:TI_LOW_POWER_DOCS_LINK}} Low Power Modes] article. | |||
<br> | |||
<br> | |||
While this wiki article does not serve to duplicate information, it will highlight some of the key important modes and usages on Variscite's development platform. | |||
= Suspend to RAM (Deep Sleep) = | |||
Deep Sleep AKA Suspend-to-RAM is a low-power mode that allows an embedded device to retain its state in RAM while the processor is turned off. This can save a significant amount of power, especially in devices that are battery-powered. | |||
In order to enter deep sleep, use the following command: | |||
root@am62x-var-som:~# pm-suspend | |||
[ 26.430955] mmc2: card 0001 removed | |||
[ 26.668685] am65-cpsw-nuss 8000000.ethernet eth0: Link is Down | |||
[ 26.716750] am65-cpsw-nuss 8000000.ethernet eth1: Link is Down | |||
[ 26.875564] PM: suspend entry (deep) | |||
[ 26.880123] Filesystems sync: 0.000 seconds | |||
[ 26.904501] remoteproc remoteproc0: stopped remote processor 5000000.m4fss | |||
[ 26.925158] Freezing user space processes | |||
[ 26.931899] Freezing user space processes completed (elapsed 0.002 seconds) | |||
[ 26.938937] OOM killer disabled. | |||
[ 26.942261] Freezing remaining freezable tasks | |||
[ 26.948416] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) | |||
[ 26.955832] printk: Suspending console(s) (use no_console_suspend to debug) | |||
= Wake up = | |||
Various wakeup sources are possible on the AM62. On Variscite's development platform, the touchscreen has been configured as a wakeup source using TI's "I/O Daisy Chain" method. | |||
ft5x06_ts: ft5x06_ts@38 { | |||
compatible = "edt,edt-ft5206"; | |||
reg = <0x38>; | |||
pinctrl-names = "default"; | |||
pinctrl-0 = <&captouch_pins_default>; | |||
interrupts-extended = <&main_gpio1 16 IRQ_TYPE_EDGE_FALLING>, | |||
<&main_pmx0 0x1B8>; | |||
interrupt-names = "irq", "wakeup"; | |||
touchscreen-size-x = <800>; | |||
touchscreen-size-y = <480>; | |||
touchscreen-inverted-x; | |||
touchscreen-inverted-y; | |||
wakeup-source; | |||
status = "okay"; | |||
}; | |||
Touching the screen after the system has been suspended will wake the system. | |||
For more information on available wake-up sources, please consult TI's [{{#var:TI_WAKEUP_SOURCES_DOCS_LINK}} Wakeup Sources] article. | |||
= CPU Hotplug = | |||
See the Variscite [https://variwiki.com/index.php?title=CPU_freq_and_num_of_cores Set the CPU freq. and number of active cores] article for more information. | |||
Latest revision as of 19:02, 11 April 2024
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VAR-SOM-AM62 Low Power Modes
Background
TI's AM62 contains numerous low power modes and features. Extensive documentation on the subject can be found by consulting TI's Low Power Modes article.
While this wiki article does not serve to duplicate information, it will highlight some of the key important modes and usages on Variscite's development platform.
Suspend to RAM (Deep Sleep)
Deep Sleep AKA Suspend-to-RAM is a low-power mode that allows an embedded device to retain its state in RAM while the processor is turned off. This can save a significant amount of power, especially in devices that are battery-powered.
In order to enter deep sleep, use the following command:
root@am62x-var-som:~# pm-suspend [ 26.430955] mmc2: card 0001 removed [ 26.668685] am65-cpsw-nuss 8000000.ethernet eth0: Link is Down [ 26.716750] am65-cpsw-nuss 8000000.ethernet eth1: Link is Down [ 26.875564] PM: suspend entry (deep) [ 26.880123] Filesystems sync: 0.000 seconds [ 26.904501] remoteproc remoteproc0: stopped remote processor 5000000.m4fss [ 26.925158] Freezing user space processes [ 26.931899] Freezing user space processes completed (elapsed 0.002 seconds) [ 26.938937] OOM killer disabled. [ 26.942261] Freezing remaining freezable tasks [ 26.948416] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) [ 26.955832] printk: Suspending console(s) (use no_console_suspend to debug)
Wake up
Various wakeup sources are possible on the AM62. On Variscite's development platform, the touchscreen has been configured as a wakeup source using TI's "I/O Daisy Chain" method.
ft5x06_ts: ft5x06_ts@38 {
compatible = "edt,edt-ft5206";
reg = <0x38>;
pinctrl-names = "default";
pinctrl-0 = <&captouch_pins_default>;
interrupts-extended = <&main_gpio1 16 IRQ_TYPE_EDGE_FALLING>,
<&main_pmx0 0x1B8>;
interrupt-names = "irq", "wakeup";
touchscreen-size-x = <800>;
touchscreen-size-y = <480>;
touchscreen-inverted-x;
touchscreen-inverted-y;
wakeup-source;
status = "okay";
};
Touching the screen after the system has been suspended will wake the system.
For more information on available wake-up sources, please consult TI's Wakeup Sources article.
CPU Hotplug
See the Variscite Set the CPU freq. and number of active cores article for more information.