Re: [Hx4700-port] [RFC] Power consumption

[Todd Blumer]

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).

Hope this helps. Thanks for your testing!
--
Todd

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