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

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Message-ID: <20090815164324.GA4252@sirena.org.uk>
Date:	Sat, 15 Aug 2009 17:43:24 +0100
From:	Mark Brown <broonie@...ena.org.uk>
To:	Pavel Machek <pavel@....cz>
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)

On Fri, Aug 14, 2009 at 06:32:01PM +0200, Pavel Machek wrote:

> Please don't put basic fastcharge logic to userspace:

> * you still want to fastcharge at init=/bin/bash boot

> * you want to fastcharge while machine is in s2ram. See spitz. Doing
>   that with userspace would be quite tricky.

Depending on the technologies involved and how well integrated the power
path management is with the battery charger fast charge during suspend
may not actually be desirable.  Some systems need or desire active
thermal management of the system from the CPU during fast charge.
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