From: daniel.lezcano@linaro.org (Daniel Lezcano)
To: linux-arm-kernel@lists.infradead.org
Subject: IRQ and FIQ disabling during sleep states.
Date: Thu, 12 Jul 2012 18:05:46 +0200 [thread overview]
Message-ID: <4FFEF5DA.8000505@linaro.org> (raw)
In-Reply-To: <20120711123020.GW2416@tbergstrom-lnx.Nvidia.com>
On 07/11/2012 02:30 PM, Peter De Schrijver wrote:
> Hi,
>
> I noticed several platforms exhibit different behaviour wrt disabling IRQ or
> FIQ when entering a CPU idle state. Tegra for example disables both FIQ and
> IRQ when entering CPU clockstop, but OMAP seems to only disable FIQs? Also
> the generic cpuidle_wrap_enter() function, enables IRQs after return from
> the idle state, but doesn't disable them.
>
> Some questions:
>
> 1) I assume we need to disable IRQ/FIQ to not confuse the cpuidle code due to
> late interrupts?
> 2) What prevents us from unifying this?
AFAIR, Rob Lee discussed about this point already. Maybe he has a
pointer to the discussion.
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next prev parent reply other threads:[~2012-07-12 16:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-11 12:30 IRQ and FIQ disabling during sleep states Peter De Schrijver
2012-07-12 16:05 ` Daniel Lezcano [this message]
2012-07-18 16:19 ` Rob Lee
2012-07-18 16:31 ` Shilimkar, Santosh
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