linux-kernel - Re: [PATCH v3] PM / sleep: enable suspend-to-idle even without registered suspend

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Message-ID: <4275273.9VZ8d8sI3E@vostro.rjw.lan>
Date:   Wed, 14 Sep 2016 03:06:24 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v3] PM / sleep: enable suspend-to-idle even without registered suspend_ops

On Friday, August 19, 2016 02:41:00 PM Sudeep Holla wrote:
> Suspend-to-idle (aka the "freeze" sleep state) is a system sleep state
> in which all of the processors enter deepest possible idle state and
> wait for interrupts right after suspending all the devices.
> 
> There is no hard requirement for a platform to support and register
> platform specific suspend_ops to enter suspend-to-idle/freeze state.
> Only deeper system sleep states like PM_SUSPEND_STANDBY and
> PM_SUSPEND_MEM rely on such low level support/implementation.
> 
> suspend-to-idle can be entered as along as all the devices can be
> suspended. This patch enables the support for suspend-to-idle even on
> systems that don't have any low level support for deeper system sleep
> states and/or don't register any platform specific suspend_ops.
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Applied.

Thanks,
Rafael