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.
> more elegant alternative options(suspend-to-idle) and any such attempts
> to hack around the PSCI will be NACKed.
"s2idle" does not power down secondary CPU cores, so this is an improvement.
"deep" may not support configured wake-up sources, which is a bug.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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