Re: PM branch rebased to 2.6.29

[David Brownell <david-b@pacbell.net>]

On Tuesday 17 March 2009, Kevin Hilman wrote:
> - Beagle: MMC regulator: unbalanced disables.  This happens on boot
>   and during suspend/resume. I don't think this is related to the PM
>   branch, but is probably in linux-omap HEAD also, but didn't test.

It is.  Other boards may see that too.  Two fixes:

 * Least hassle ... I think all these should merge to the
   linux-omap tree in any case (and thence linux-pm):

    http://marc.info/?l=linux-omap&m=123699264117846&w=2
    http://marc.info/?l=linux-omap&m=123699340818395&w=2
    http://marc.info/?l=linux-omap&m=123705919713239&w=2

 * Or there are a number of regulator-framework patches
   floating around, all of which fix the bug there...

The root cause of this is that u-boot leaves VMMC1 active,
and the regulator framework doesn't cope with that yet.
The stackdump is basically caused by self-inconsistencies
in that framework.

The first fix lets the twl4030-power driver (not yet on
track for mainline merge) undo that, so the regulator
framework will no longer be confused.  That presumes a
bunch of board-specific patches fix that issue.  (As
well as setting up other power resources, e.g. so that
CLKREQ behaves, which is the real goal of that patch.)

The second fix -- in some flavor -- is IMO still needed,
since the first fix is just avoiding regulator framework
bugs.  

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