Power management concept...

Harald Welte laforge at openmoko.org
Tue Apr 24 13:48:26 CEST 2007

On Tue, Apr 24, 2007 at 01:29:09PM +0200, Nils Faerber wrote:
> Harald Welte schrieb:
> > On Fri, Apr 20, 2007 at 12:53:10PM +0200, Nils Faerber wrote:
> >> Harald Welte schrieb:
> >>> On Thu, Apr 19, 2007 at 05:16:51PM +0200, Nils Faerber wrote:
> >>>> Yes, saw that. Though that the GSM modem seems to be quite confused
> >>>> afterwards, i.e. I have to power it down, power on again and restart
> >>>> gsmd to get it to work again (most of the times at least).
> >>> Note that none of the phones ever shipped has a GSM firmware installed
> >>> that supports proper suspend/resume.  We have something like a six to
> >>> eight week turn around time when reporting an issue to Ti until we get a
> >>> fix :(
> >> If the suspend mode (i.e. power-off mode in Samsung terms, i.e. self
> >> refresh SDRAM and wake-up configured) is the mode that will be used as
> >> state 90% of the run-time (most of the time the phone will be waiting
> >> for events in a pocket) couldn't we simply leave the modem running in
> >> run-state and leave the suspend/resume feature as a later enhancement?
> > the suspend mode (power-off mode with sdram self-refresh) is exactly the
> > suspend/resume that we're talking about.
> > 
> > I don't really understand what you want, sorry.  
> In other words I wanted to know if the idle mode would be in use instead
> of the power-off mode. That would make the device more responsive
> (wake-up latency) and is exactly what is also used by other devices like
> the Nokia 770/N800 and obviously working well.

there is no idle mode. there's only slow mode, which gets rid of the
PLL's but is significantly higher, power-consumption wise.

Also, the generic 24xx code in the kernel currently does not yet suport
slow mode.   IIRC, Ben is working on this.

So since we don't have a particular interest in adding this to our TODO
list, we expect to support SLOW mode as soon as the mainline kernel
supports it ;)

- Harald Welte <laforge at openmoko.org>          	        http://openmoko.org/
Software for the world's first truly open Free Software mobile phone
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