[SHR-Unstable] Forcing fast-charge
joerg at openmoko.org
Thu May 7 01:03:22 CEST 2009
Am Mo 4. Mai 2009 schrieb Cédric Berger:
> Sorry, my mail was not really clear.
> Rask already answered questions.
> But just about usb_limit :
> 2009/5/2 Joerg Reisenweber <joerg at openmoko.org>
> > No you have to push USB_CURLIM to >500mA, if you want >500mA.
> [... ]
> > > This way I have about 700-750mA pulled from my charger (though it can
> > peak
> > > to 1A as needed).
> > What's the rationale behind that?
> > If you set USB_CURLIM to 750mA you get exactly the same behaviour without
> > the
> > useless "when needed" part.
> As far as I know, 750mA is not an option for usb_curlim. (only 100, 500 and
> 1000 I think)
> Anyway, bat_curlim allows more precise control.
Correct - usbdevstat allows 100mA, 500mA, 1A, and suspend (Tbl. 98, MBCC7),
Setting chg_curlim won't help whatsoever, as you can set it only during device
powered up and system running, and during this time the system consumption
USB-to-SYS will add to the chg_curlim you set. So you exceed intended USB
current by setting chg_curlim to the value you intend for USB current, just
to shutdown device after that and hope to reach 'correct' USB current then
eventually - that's silly.
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