USB low power / off mode ?

ranchu

Guru 20755 points

Hello,

Is it possibe to change usb host/device mode from off/on for power saving ?

Thank you,

Ran

over 8 years ago

0 Pavel Botev over 8 years ago

TI__Guru**** 170625 points

Hi Ran,

No, USB power can not be turn off individually. USB belongs to the Always ON power domain, and this power domain does not have internal power switch.

For power saving, you can disable USB clocks. Look at the suspend functionality in the USB driver.

processors.wiki.ti.com/.../TI81XX_PSP_PM_SUSPEND_RESUME_User_Guide

Suspend Sequence:WFI/StandBy and DeepSleep
1. User triggers suspend through sysfs entry - /sys/power/state
2. Kernel invokes device suspend - drivers execute their suspend calls I2c, USB, MMC, etc.

BR
Pavel

Processors

Processors forum

USB low power / off mode ?