Re: [Dynamicpower-devel] Sleep and deep sleep state

[Manish R. <man...@st...>]

Hi,
If I update only xtime not jiffies then any maturing timer started before
going sleep mode behave wrongly.
What's ur opinion?
In OMAP/PXA is it possible to take system in sleep mode thru sysfs if yes
then ehere this sysfs file
Reside?

Regards
Manish


-----Original Message-----
From: Todd Poynor [mailto:tod...@qa...] 
Sent: Friday, March 16, 2007 12:17 AM
To: Manish RATHI; dyn...@li...
Subject: Re: [Dynamicpower-devel] Sleep and deep sleep state


On Thu, 15 Mar 2007 1:11 am, Manish RATHI wrote:
> Hi,
> Is there any interface (sysfs or any other) in linux by which I can 
> take system into sleep mode?

Standard feature of linux, several embedded board families such as TI OMAPs
and Intel/Marvell PXA2xx implement the pm_ops that hook up to the generic
interface.

> Is there any reference code in which timer is updated by  sleep 
> duration? Is it OK if I directly update Jiffies in my code.

Adjusting jiffies for sleep intervals is not standard practice in linux
(jiffies are relative OS time that can be considered to be frozen during OS
inactivity).  Adjust wall time (xtime) according to RTC or other timesource
that keeps time during the sleep.  See existing rtc drivers suspend/resume
callbacks.
--todd