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Message-ID: <20090907113132.GM23450@elf.ucw.cz>
Date: Mon, 7 Sep 2009 13:31:32 +0200
From: Pavel Machek <pavel@....cz>
To: Richard Purdie <rpurdie@...ys.net>
Cc: lenz@...wisc.edu, kernel list <linux-kernel@...r.kernel.org>,
Dirk@...er-Online.de, arminlitzel@....de,
Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>,
dbaryshkov@...il.com, omegamoon@...il.com, eric.miao@...vell.com,
utx@...guin.cz
Subject: Re: Zaurus suspend saga
Hi!
> > fatal reads invalid values -- -108 -- probably because spi is not ready?
> >
> > is spi suspend/resume required? yes.; and yes spi is resumed too late
> > in the sequence. Or perhaps fatal battery check is way too early.
> >
> > Could someone confirm that simply removing sharpsl_fatal_check() fixes
> > zaurus suspend on 2.6.31?
>
> Sadly lack of time means I've lost track of the Zaurus kernels but this
> sounds like all accesses to the SSP buses now go through the SPI layer
> and when it was converted nobody thought about the impact this would
> have on the Zaurus charger code.
Unfortunately... Do you have any idea when this conversion took place?
> If suspend/resume is broken in this way, it also means the charger code
> is also likely to be totally broken/malfunctioning since it won't be
> able to read from the ADC either.
Yes. Seems like low-level zaurus code is FUBAR.
> Either:
>
> a) Someone steps up and finds a way to partially resume the kernel so
> the "offline" charging code can work and access SPI
> b) We find some other way to allow the SPI interface to be accessed by
> the charger code without resuming the whole kernel (the way it used to
> work)
Doing that in a hacky way should be rather easy... just calling spi
resume manually. But...
> c) We rip the whole thing out and stop supporting "offline" charging.
How much faster is offline charge, compared to online charging? I have
impression that online charging basically does not charge anything...
> I'd hate to see c) happen but I doubt I'm going to find time to rewrite
> that code any time soon and nobody else even seems to have grasped how
> deep this problem really is :(.
Well, I have a bit of time now and then...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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