Commit d6d00742 authored Sep 10, 2015 by Javi Merino Committed by Eduardo Valentin Oct 30, 2015

PM / OPP: get the voltage for all OPPs



The OPP library is now used for power models to calculate the power
that a device would consume at a specific OPP.  To do that, we use a
simple power model which takes frequency and voltage as inputs.  We get
the voltage and frequency from the OPP library.

The devfreq cooling device for the thermal framework controls
temperature by disabling OPPs.  The power model needs to calculate the
power that would be consumed if we reenabled the OPP.  Therefore, let
dev_pm_opp_get_voltage() work for disabled OPPs.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

parent b840b6e6

drivers/base/power/opp.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -217,7 +217,7 @@ static struct device_opp _find_device_opp(struct device dev)
		}

		/**
		* dev_pm_opp_get_voltage() - Gets the voltage corresponding to an available opp
		* dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
		* @opp: opp for which voltage has to be returned for
		*
		* Return: voltage in micro volt corresponding to the opp, else
		@@ -239,7 +239,7 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
		opp_rcu_lockdep_assert();

		tmp_opp = rcu_dereference(opp);
		if (IS_ERR_OR_NULL(tmp_opp) \|\| !tmp_opp->available)
		if (IS_ERR_OR_NULL(tmp_opp))
		pr_err("%s: Invalid parameters\n", __func__);
		else
		v = tmp_opp->u_volt;

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