linux-kernel - Re: [PATCH v3] ARM: tegra: cpuidle: implement cpuidle_state.enter

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Date:	Thu, 13 Aug 2015 16:54:47 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-pm@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Ingo Molnar <mingo@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ARM: tegra: cpuidle: implement
 cpuidle_state.enter_freeze()

On Tue, May 19, 2015 at 04:49:12PM +0200, 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@...labora.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> ---
> 
> v3:	* Set CPUIDLE_FLAG_TIMER_STOP to simplify things as suggested by
> 	Lorenzo Pieralisi
> v2:	* Disable FIQs also when suspending-to-idle
> ---
>  arch/arm/mach-tegra/cpuidle-tegra114.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)

Applied, thanks.

Thierry

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