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In order to synchronize the Low Power mode, the services were immediately informed about the frequency change, so that they can update their resources (e.g. PWM filling) and services may request the maximum CPU frequency in order to perform a task (e.g. screen redraw, telephone conversation)
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
// Copyright (c) 2017-2021, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#ifndef PUREPHONE_POWERMANAGER_HPP
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#define PUREPHONE_POWERMANAGER_HPP
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#include <functional>
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#include "bsp/lpm/bsp_lpm.hpp"
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#include "drivers/semc/DriverSEMC.hpp"
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#include "CpuGovernor.hpp"
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namespace sys
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{
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inline constexpr uint32_t frequencyShiftLowerThreshold{40};
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inline constexpr uint32_t frequencyShiftUpperThreshold{60};
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inline constexpr uint32_t maxBelowThresholdCount{50};
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inline constexpr uint32_t maxAboveThresholdCount{3};
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class PowerManager
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{
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public:
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PowerManager();
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~PowerManager();
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int32_t PowerOff();
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int32_t Reboot();
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/// called periodically to calculate the CPU requirement
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///
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/// if for the last 'maxAboveThresholdCount' periods the current CPU consumption has been above the set upper
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/// limit (frequencyShiftUpperThreshold), CPU frequency is increased; if for the last 'maxBelowThresholdCount'
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/// periods the current CPU usage was below the lower limit (frequencyShiftLowerThreshold), CPU frequency is
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/// reduced frequency
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/// @param current cpu load
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void UpdateCpuFrequency(uint32_t cpuLoad);
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/// called when the CPU frequency needs to be increased
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/// @note the frequency is always increased to the maximum value
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void IncreaseCpuFrequency() const;
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/// called when the CPU frequency needs to be reduced
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/// @note the frequency is always reduced by one step
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void DecreaseCpuFrequency() const;
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[[nodiscard]] auto getExternalRamDevice() const noexcept -> std::shared_ptr<devices::Device>;
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void RegisterNewSentinel(std::shared_ptr<CpuSentinel> newSentinel) const;
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void SetCpuFrequencyRequest(std::string sentinelName, bsp::CpuFrequencyHz request) const;
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private:
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void ResetFrequencyShiftCounter();
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void SetCpuFrequency(bsp::CpuFrequencyHz freq) const;
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uint32_t belowThresholdCounter{0};
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uint32_t aboveThresholdCounter{0};
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std::unique_ptr<bsp::LowPowerMode> lowPowerControl;
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std::shared_ptr<drivers::DriverSEMC> driverSEMC;
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std::unique_ptr<CpuGovernor> cpuGovernor;
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};
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} // namespace sys
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#endif // PUREPHONE_POWERMANAGER_HPP
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