Re: [RFC] Power consumption

On 3/24/06, Todd Blumer <todd_at_sdgsystems.com> wrote:
>
>
> cBou wrote:
> > On Thu, Mar 23, 2006 at 03:50:58PM -0800, Matt Reimer wrote:
> >
> >>> Matt Reimer wrote:
> >>> You mean twiddling GPIOs with devmem2 and see how the current goes up
> >>> and down?
> >>>
> >> Exactly.
> >>
> >
> > Okey, I've played a little with gpios, and succeed to down current while
> > sleep to 70 mA. I've done it through setting GPIO_NR_HX4700_W3220_RESET_N (61).
> > LCD display turns off when I set it, and I don't know how to turn it on
> > again (clearing that GPIO don't work). Though, I have played with all
> > gpios separately (as you can see with very little success), I'll try to play
> > with them more later this day in various combinations.
> >
> > Any more ideas, beside gpios?
> >
> >
> I don't have the source in front of me, but you should be able to see
> from hx4700_lcd.c how to turn back on the LCD.
>
> I'll try to think of some more power ideas. There is the MAX power
> controller chip that we currently do not configure at all. You can also
> try to put the PXA into deep sleep instead of just sleep, as an
> experiment. Also, it's possible that the bootldr may have different
> settings than hx4700_core.c (but, iirc, the bootldr isn't involved at
> all during sleep unless it thinks that there is USB or AC charging going
> on, though it may need to wake up once to check those things, and most
> certainly will wake up if you plug in AC or USB).

I tried keeping bootldr from waking, but that didn't help power consumption.

Matt
Received on Fri Mar 24 2006 - 18:55:00 EST