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Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze()

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  Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze() Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-06-18 09:20 +0200

#1167622 — Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter_freeze()

On 21 May 2015 at 03:02, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> On Tuesday, May 19, 2015 04:49:12 PM Tomeu Vizoso wrote:
>> This callback is expected to do the same as enter() but it has to
>> guarantee that interrupts aren't enabled at any point in its execution,
>> as the tick is frozen.
>>
>> It will be called when the system goes to suspend-to-idle and will
>> reduce power usage because CPUs won't be awaken for unnecessary IRQs.
>>
>> By setting the CPUIDLE_FLAG_TIMER_STOP flag, we can reuse the same code
>> for both the enter() and enter_freeze() callbacks.
>>
>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
>> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> Makes sense to me, but I suppose it should go in via arm-soc.

Hi Thierry,

what's the plan regarding merging of this patch?

It needs df8d9ee ("cpuidle: Run tick_broadcast_exit() with disabled
interrupts") so it doesn't break boot.

Thanks,

Tomeu
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