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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-21 GuEe-GUI first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "dvfs.governor.performance"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
static rt_err_t governor_performance_start(struct rt_dvfs_scaling *dvfs)
{
rt_err_t err;
if (!dvfs)
{
return -RT_EINVAL;
}
/* Set frequency to maximum */
err = rt_dvfs_scaling_set_frequency(dvfs, dvfs->max_freq);
if (err)
{
LOG_E("%s: set max frequency failed: %s",
rt_dm_dev_get_name(dvfs->dev), rt_strerror(err));
return err;
}
LOG_D("%s: performance governor started at %lu Hz",
rt_dm_dev_get_name(dvfs->dev), dvfs->cur_freq);
return RT_EOK;
}
static rt_err_t governor_performance_stop(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
LOG_D("%s: performance governor stopped", rt_dm_dev_get_name(dvfs->dev));
return RT_EOK;
}
static rt_err_t governor_performance_suspend(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
/* Nothing special for suspend */
return RT_EOK;
}
static rt_err_t governor_performance_resume(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
/* Restore to max frequency */
return rt_dvfs_scaling_set_frequency(dvfs, dvfs->max_freq);
}
static rt_err_t governor_performance_set_interval(struct rt_dvfs_scaling *dvfs, rt_uint32_t interval_ms)
{
/* Performance governor doesn't use sampling interval */
return -RT_ENOSYS;
}
static rt_err_t governor_performance_set_frequency(struct rt_dvfs_scaling *dvfs, rt_ubase_t *out_freq)
{
if (!dvfs || !out_freq)
{
return -RT_EINVAL;
}
/* Always return max frequency */
*out_freq = dvfs->max_freq;
return RT_EOK;
}
static struct rt_dvfs_governor governor_performance =
{
.name = "performance",
.type = RT_DVFS_GOVERNOR_TYPE_PERFORMANCE,
.start = governor_performance_start,
.stop = governor_performance_stop,
.suspend = governor_performance_suspend,
.resume = governor_performance_resume,
.set_interval = governor_performance_set_interval,
.set_frequency = governor_performance_set_frequency,
};
static int governor_performance_init(void)
{
rt_dvfs_governor_register(&governor_performance);
return 0;
}
INIT_CORE_EXPORT(governor_performance_init);
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