b02c999ac3
Add a function deciding whether or not devices should be stopped in pm_genpd_runtime_suspend() depending on their PM QoS constraints and stop/start timing values. Make it possible to add information used by this function to device objects. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
33 lines
864 B
C
33 lines
864 B
C
/*
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* drivers/base/power/domain_governor.c - Governors for device PM domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_qos.h>
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/**
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* default_stop_ok - Default PM domain governor routine for stopping devices.
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* @dev: Device to check.
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*/
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bool default_stop_ok(struct device *dev)
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{
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struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
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dev_dbg(dev, "%s()\n", __func__);
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if (dev->power.max_time_suspended_ns < 0 || td->break_even_ns == 0)
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return true;
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return td->stop_latency_ns + td->start_latency_ns < td->break_even_ns
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&& td->break_even_ns < dev->power.max_time_suspended_ns;
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}
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struct dev_power_governor simple_qos_governor = {
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.stop_ok = default_stop_ok,
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};
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