linux-kernel - Re: [PATCH RFC] PM / Runtime: Rework the "runtime idle" helper routine

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Date:	Fri, 31 May 2013 12:55:56 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH RFC] PM / Runtime: Rework the "runtime idle" helper routine

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The "runtime idle" helper routine, rpm_idle(), currently ignores
> return values from .runtime_idle() callbacks executed by it.
>
> However, it turns out that many subsystems use the generic idle
> callback routine pm_generic_runtime_idle() which checks the return
> value of the driver's callback and executes pm_runtime_suspend() for
> the device unless that value is different from 0.  If that logic is
> moved to rpm_idle() instead, pm_generic_runtime_idle() can be dropped
> and its users will not need any .runtime_idle() callbacks any more.
>
> Moreover, the PCI subsystem's .runtime_idle() routine,
> pci_pm_runtime_idle(), works in analogy with the generic one and if
> rpm_idle() calls rpm_suspend() after 0 has been returned by the
> .runtime_idle() callback executed by it, that routine will not be
> necessary any more and may be dropped.
>
> To reduce overall code duplication make the changes described above.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Kevin Hilman <khilman@...aro.org>
Tested-by: Kevin Hilman <khilman@...aro.org> # for OMAP PM domain change

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