7d2586533d
When system going to sleep state, make peripherals go to state DEVICE_PM_LOW_POWER_STATE which needs less time than state DEVICE_PM_SUSPEND_STATE to save more power. Signed-off-by: Wentong Wu <wentong.wu@intel.com>
46 lines
949 B
C
46 lines
949 B
C
/*
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* Copyright (c) 2018 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <kernel.h>
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#include "pm_policy.h"
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#include <logging/log.h>
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LOG_MODULE_DECLARE(power, CONFIG_SYS_PM_LOG_LEVEL);
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enum power_states sys_pm_policy_next_state(s32_t ticks)
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{
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static u8_t cur_power_state;
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int i = cur_power_state;
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if (SYS_POWER_STATE_MAX == 0) {
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/* No power states to go through. */
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return SYS_POWER_STATE_ACTIVE;
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}
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do {
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i = (i + 1) % SYS_POWER_STATE_MAX;
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#ifdef CONFIG_SYS_PM_STATE_LOCK
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if (!sys_pm_ctrl_is_state_enabled((enum power_states)(i))) {
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continue;
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}
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#endif
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cur_power_state = i;
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LOG_DBG("Selected power state: %u", i);
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return (enum power_states)(i);
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} while (i != cur_power_state);
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LOG_DBG("No suitable power state found!");
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return SYS_POWER_STATE_ACTIVE;
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}
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__weak bool sys_pm_policy_low_power_devices(enum power_states pm_state)
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{
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return sys_pm_is_sleep_state(pm_state);
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}
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