linux-kernel - Re: Smart Battery System Design (was: Re: Question about userspace-consumer)

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Message-ID: <20090822193515.GA15488@elf.ucw.cz>
Date:	Sat, 22 Aug 2009 21:35:15 +0200
From:	Pavel Machek <pavel@....cz>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Felipe Balbi <me@...ipebalbi.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mike Rapoport <mike@...pulab.co.il>,
	linux-kernel@...r.kernel.org
Subject: Re: Smart Battery System Design (was: Re: Question about
	userspace-consumer)

Hi!

> > > Like you say this is a very old design but even there I'm fairly
> > > surprised it's causing issues when charging from a wall supply.  If
> > > you're charging from USB then there is obviously a constraint on the
> > > power draw but normally a modern system has sufficiently low power draw
> > > when idle that it's not actually a big deal - runtime power management
> > > facilities have improved greatly.
> 
> > Well... all the hardware I have here (zaurus, openmoko, htc dream) has
> > issues with power consumption while charging... so I do not think
> > runtime pm is solved problem.
> 
> The Zaurus and OpenMoko aren't exactly modern designs.  The Dream does
> surprise me, though.  I can't find any references to issues with this -
> any pointers?  If the phone were actually in use I'd expect it to have
> trouble charging off USB but sitting idle it's a lot more surprising,
> especially running Android.

Well, I'd like the older designs to work well too. (Actually, the
Dream... was on wifi when I got bad problems charging it from
usb.... so maybe charging while suspended would not help there).
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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