2.6.35.6 fails to suspend (pxa2xx-mci.0)

Rafael J. Wysocki
2010-10-08T20:08:25Z

On Friday, October 08, 2010, Sven Neumann wrote:
> On Thu, 2010-10-07 at 23:23 +0200, Rafael J. Wysocki wrote:
>
> > > > I wonder what happens if you echo 0 to /sys/power/pm_async ?
> > >
> > > Nothing happens. The problem persists (tested with 2.6.36-rc7). What
> > > would you expect to happen?
> >
> > Exactly that. :-)
> >
> > Commit 152e1d5920 should not affect the non-async case (I'd be surprised if
> > it did really) and things should work with /sys/power/pm_async = 0 anyway.
> >
> > Please try check if you can reproduce with commt 152e1d5920 reverted and
> > /sys/power/pm_async = 0. If you can, that's a driver bug.
>
> Ok, for the record, here's what I tried. I have rebooted between tests
> to make sure there's no state pulled in from the previous test:
>
> 2.6.36-rc7, no changes, pm_async 1 : suspend fails
> 2.6.36-rc7, no changes, pm_async 0 : suspend fails
>
> 2.6.36-rc7, 152e1d reverted, pm_async 1 : suspend works
> 2.6.36-rc7, 152e1d reverted, pm_async 0 : suspend fails
>
> 2.6.34.7, no changes, pm_async 1 : suspend works
> 2.6.34.7, no changes, pm_async 0 : suspend works
>
> I am not sure how this should be interpreted.

There is a problem with the pxa2xx-mci.0 suspend that has been introduced
some time after 2.6.34, but it is not related to commit 152e1d5920. The
problem was not visible with pm_async=1 because of the very bug fixed by
commit 152e1d5920.

Please see if the problem is there in 2.6.35 (please test with pm_async=0).

Thanks,
Rafael