Re: [PATCH 0/3] cpuidle: updates related to tick_broadcast_enter() failures

From: Kevin Hilman
Date: Wed May 13 2015 - 20:13:36 EST

On Wed, May 13, 2015 at 5:16 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> On Wednesday, May 13, 2015 03:59:55 PM Kevin Hilman wrote:
>> "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> writes:
>> [...]
>> > Second, quite honestly, I don't see a connection to genpd here.
>> The connection with genpd is because the *reason* the timer was
>> shutdown/stopped is because it shares power with the CPU, which is why
>> the timer stops when the CPU hits ceratin low power states. IOW, it's
>> in the same power domain as the CPU.
> Well, what if you don't have genpd on that system? Is the problem at hand not
> relevant then magically?

Well, if you're not using genpd to model hardware power domain
dependencies, then yes you'll definitely need a different solution.

And, as we discussed on IRC. If you only care about timers, and genpd
is not in use, then $SUBJECT series is a fine approach, and I have no
objections. But for SoCs where there are several other things that
share power with CPU, we need a more generic, genpd based solution,
which it seems we're in agreement on. And since the two approaches
are not mutually exclusive, then I have real objections to applying
this series.

Acked-by: Kevin Hilman <khilman@xxxxxxxxxx>

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