1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* 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.powersave"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
static rt_err_t governor_powersave_start(struct rt_dvfs_scaling *dvfs)
{
rt_err_t err;
if (!dvfs)
{
return -RT_EINVAL;
}
/* Set frequency to minimum */
err = rt_dvfs_scaling_set_frequency(dvfs, dvfs->min_freq);
if (err)
{
LOG_E("%s: set min frequency failed: %s",
rt_dm_dev_get_name(dvfs->dev), rt_strerror(err));
return err;
}
LOG_D("%s: powersave governor started at %lu Hz",
rt_dm_dev_get_name(dvfs->dev), dvfs->cur_freq);
return RT_EOK;
}
static rt_err_t governor_powersave_stop(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
LOG_D("%s: powersave governor stopped", rt_dm_dev_get_name(dvfs->dev));
return RT_EOK;
}
static rt_err_t governor_powersave_suspend(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
/* Nothing special for suspend */
return RT_EOK;
}
static rt_err_t governor_powersave_resume(struct rt_dvfs_scaling *dvfs)
{
if (!dvfs)
{
return -RT_EINVAL;
}
/* Restore to min frequency */
return rt_dvfs_scaling_set_frequency(dvfs, dvfs->min_freq);
}
static rt_err_t governor_powersave_set_interval(struct rt_dvfs_scaling *dvfs, rt_uint32_t interval_ms)
{
/* Powersave governor doesn't use sampling interval */
return -RT_ENOSYS;
}
static rt_err_t governor_powersave_set_frequency(struct rt_dvfs_scaling *dvfs, rt_ubase_t *out_freq)
{
if (!dvfs || !out_freq)
{
return -RT_EINVAL;
}
/* Always return min frequency */
*out_freq = dvfs->min_freq;
return RT_EOK;
}
static struct rt_dvfs_governor governor_powersave =
{
.name = "powersave",
.type = RT_DVFS_GOVERNOR_TYPE_POWERSAVE,
.start = governor_powersave_start,
.stop = governor_powersave_stop,
.suspend = governor_powersave_suspend,
.resume = governor_powersave_resume,
.set_interval = governor_powersave_set_interval,
.set_frequency = governor_powersave_set_frequency,
};
static int governor_powersave_init(void)
{
rt_dvfs_governor_register(&governor_powersave);
return 0;
}
INIT_CORE_EXPORT(governor_powersave_init);
|
