Messages in this thread | | | Date | Tue, 5 Mar 2013 14:27:17 +0800 | From | Feng Tang <> | Subject | Re: [RFC PATCH v2 0/4] Add support for S3 non-stop TSC support. |
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On Mon, Mar 04, 2013 at 09:32:03PM -0700, Jason Gunthorpe wrote: > On Tue, Mar 05, 2013 at 11:53:02AM +0800, Feng Tang wrote:
> > > You may want to also CC the maintainers of all the ARM subsystems that > > > use read_persistent_clock and check with them to ensure this new > > > interface will let them migrate their implementations as well. > > > > Maybe I didn't get it well, my patches didn't change the > > read_persistent_clock(), but inject a new way of counting suspended > > time. It should have no functional changes to existing platforms. > > Right, your patches are fine stand alone. > > The ARM case of plat-omap/counter_32k.c would ideally be converted to > use your new API though, that is what I ment about involving them.
I see now. Yes, the counter_32k could be converted to a clocksource with SUSPEND_NONSTOP flag set, and no need for it to use the read_persistent_clock any more.
> > I'm not sure about mach-tegra/timer.c though - it seems to be using a > counter as well but somehow sharing registers with the RTC?
I just searched the 3.9-rc1 code, seems the file has been moved to drivers/clocksource/tegra20_timer.c, and its persistent clock seems to also be based on a RTC like device.
Thanks, Feng
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