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hitting retention during idle

ranchu
Guru 20755 points

Hello,

In the following link http://elinux.org/OMAP_Power_Management#Enabling_system_for_hitting_retention_during_idle

it is stated as following:

Enabling system for hitting retention during idle

By default, the UARTs will not automatically idle when unused so they will prevent low-power states during idle. To enable UART idle timeouts with a 5 second timeout:

# echo 5 > /sys/devices/platform/omap/omap_uart.0/sleep_timeout               
# echo 5 > /sys/devices/platform/omap/omap_uart.1/sleep_timeout               
# echo 5 > /sys/devices/platform/omap/omap_uart.2/sleep_timeout               
# echo 5 > /sys/devices/platform/omap/omap_uart.3/sleep_timeout   

Isn't the cpuidle decide the C-state for the cpu core only  and is not depended on other devices ?
If so - why is it depends on UART state ?

Maybe the title in this section is wrong and should be "Enabling system for hitting retention during suspend" ?

Thanks,

Ran