On 21/02/17 16:23, Geert Uytterhoeven wrote: > Hi Sudeep, > > On Tue, Feb 21, 2017 at 11:42 AM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote: >> On 20/02/17 20:33, Geert Uytterhoeven wrote: >>> Enable support for "shallow" suspend mode, also known as "Standby" or >>> "Power-On Suspend". >>> >>> As secondary CPU cores are taken offline, "shallow" suspend mode saves >>> slightly more power than "s2idle", but less than "deep" suspend mode. >>> However, unlike "deep" suspend mode, "shallow" suspend mode can be used >>> regardless of the presence of support for PSCI_SYSTEM_SUSPEND, which is >>> an optional API in PSCI v1.0. >>> >>> List the available system suspend modes: >>> >>> $ cat /sys/power/mem_sleep >>> s2idle shallow [deep] >>> >>> Suspend to "shallow" mode: >>> >>> $ echo shallow > /sys/power/mem_sleep >>> $ echo mem > /sys/power/state >>> >> >> I don't have the links to such previous attempts handy, but we have > > Don't worry, I did read earlier discussions about implementing shallow mode. > In short or just to summarize in one line, just use "freeze"(a.k.a suspend-to-idle suspend mode) -- Regards, Sudeep
