Re: Clock & PM breakage in 3.0-rc2

[Kevin Hilman <khilman@ti.com>]

Jarkko Nikula <jhnikula@gmail.com> writes:

> While debugging another issue I noticed that McBSP2 clock on Nokia N900
> doesn't get disabled in 3.0-rc2 after calling
> pm_runtime_put_sync(mcbsp->dev) and the fclk usecount remains active if
> the pm_runtime_get_sync(mcbsp->dev) was ever called activating it.
>
> I believe this affects other drivers too as the system is not able to
> enter into retention idle even if the mcbsp clocks are off.
>
> I traced breakage to commit 638080c ("OMAP2+ / PM: move runtime
> PM implementation to use device power domains").
>
> Reventing that and and 2064af9 ("PM: Revert "driver core: platform_bus:
> allow runtime override of dev_pm_ops") makes both mcbsp clocks and
> retention idle working again.
>
> Unfortunately I'm not able to see quickly what would be the right fix.

This should be fixed in my for_3.0/pm-fixes branch (pull req. sent to
Tony earlier this week.)

Specifically, the "OMAP: PM: omap_device: fix device power domain callbacks"
patch should fix your problem

Can you test again with merging that branch from:

    git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm.git

Kevin