[RFC/PATCH 00/11] arm: omap: counter32k rework

Tony Lindgren tony at atomide.com
Mon Oct 5 03:55:55 PDT 2015

* Daniel Lezcano <daniel.lezcano at linaro.org> [151001 15:16]:
> On 09/30/2015 04:49 PM, Arnd Bergmann wrote:
> >On Wednesday 30 September 2015 16:42:21 Arnd Bergmann wrote:
> >>
> >>TEGRA folks: the tegra_read_persistent_clock() implementation apparently
> >>predates the Tegra RTC driver and I wonder if they actually do the
> >>right thing in combination. Could it be that the wall time forwards
> >>twice as fast as it should during resume when the RTC driver is loaded?
> >>Could it be that we can simply remove  tegra_read_persistent_clock()
> >>and the register_persistent_clock() infrastructure?
> >>
> >
> >I found the 'sleeptime_injected' variable now, which takes care of
> >forwarding the clock by the correct amount.
> >
> >I also found the CLOCK_SOURCE_SUSPEND_NONSTOP flag next to it, which
> >should let us use the counter32k driver to provide the correct
> >time during suspend without the omap_read_persistent_clock() function.
> >We should be able to just delete that code.
> >
> >If we decide to also delete the tegra_read_persistent_clock()
> >function, we can remove the registration too.
> +1

We could maybe have read_persistent_clock() just check for the

And we probably should have also has_persistent_clock() or something
that also checks for the CLOCK_SOURCE_SUSPEND_NONSTOP.



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