1
2
3#include <linux/devfreq.h>
4#include <linux/devfreq_cooling.h>
5#include <linux/platform_device.h>
6#include <linux/pm_opp.h>
7#include <linux/clk.h>
8#include <linux/regulator/consumer.h>
9
10#include "panfrost_device.h"
11#include "panfrost_devfreq.h"
12#include "panfrost_features.h"
13#include "panfrost_issues.h"
14#include "panfrost_gpu.h"
15#include "panfrost_regs.h"
16
17static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev);
18
19static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
20 u32 flags)
21{
22 struct dev_pm_opp *opp;
23 int err;
24
25 opp = devfreq_recommended_opp(dev, freq, flags);
26 if (IS_ERR(opp))
27 return PTR_ERR(opp);
28 dev_pm_opp_put(opp);
29
30 err = dev_pm_opp_set_rate(dev, *freq);
31 if (err)
32 return err;
33
34 return 0;
35}
36
37static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
38{
39 pfdev->devfreq.busy_time = 0;
40 pfdev->devfreq.idle_time = 0;
41 pfdev->devfreq.time_last_update = ktime_get();
42}
43
44static int panfrost_devfreq_get_dev_status(struct device *dev,
45 struct devfreq_dev_status *status)
46{
47 struct panfrost_device *pfdev = dev_get_drvdata(dev);
48
49 panfrost_devfreq_update_utilization(pfdev);
50
51 status->current_frequency = clk_get_rate(pfdev->clock);
52 status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.busy_time,
53 pfdev->devfreq.idle_time));
54
55 status->busy_time = ktime_to_ns(pfdev->devfreq.busy_time);
56
57 panfrost_devfreq_reset(pfdev);
58
59 dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
60 status->total_time,
61 status->busy_time / (status->total_time / 100),
62 status->current_frequency / 1000 / 1000);
63
64 return 0;
65}
66
67static struct devfreq_dev_profile panfrost_devfreq_profile = {
68 .polling_ms = 50,
69 .target = panfrost_devfreq_target,
70 .get_dev_status = panfrost_devfreq_get_dev_status,
71};
72
73int panfrost_devfreq_init(struct panfrost_device *pfdev)
74{
75 int ret;
76 struct dev_pm_opp *opp;
77 unsigned long cur_freq;
78 struct device *dev = &pfdev->pdev->dev;
79 struct devfreq *devfreq;
80 struct thermal_cooling_device *cooling;
81
82 ret = dev_pm_opp_of_add_table(dev);
83 if (ret == -ENODEV)
84 return 0;
85 else if (ret)
86 return ret;
87
88 panfrost_devfreq_reset(pfdev);
89
90 cur_freq = clk_get_rate(pfdev->clock);
91
92 opp = devfreq_recommended_opp(dev, &cur_freq, 0);
93 if (IS_ERR(opp))
94 return PTR_ERR(opp);
95
96 panfrost_devfreq_profile.initial_freq = cur_freq;
97 dev_pm_opp_put(opp);
98
99 devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
100 DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
101 if (IS_ERR(devfreq)) {
102 DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
103 dev_pm_opp_of_remove_table(dev);
104 return PTR_ERR(devfreq);
105 }
106 pfdev->devfreq.devfreq = devfreq;
107
108 cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
109 if (IS_ERR(cooling))
110 DRM_DEV_INFO(dev, "Failed to register cooling device\n");
111 else
112 pfdev->devfreq.cooling = cooling;
113
114 return 0;
115}
116
117void panfrost_devfreq_fini(struct panfrost_device *pfdev)
118{
119 if (pfdev->devfreq.cooling)
120 devfreq_cooling_unregister(pfdev->devfreq.cooling);
121 dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
122}
123
124void panfrost_devfreq_resume(struct panfrost_device *pfdev)
125{
126 if (!pfdev->devfreq.devfreq)
127 return;
128
129 panfrost_devfreq_reset(pfdev);
130
131 devfreq_resume_device(pfdev->devfreq.devfreq);
132}
133
134void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
135{
136 if (!pfdev->devfreq.devfreq)
137 return;
138
139 devfreq_suspend_device(pfdev->devfreq.devfreq);
140}
141
142static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev)
143{
144 ktime_t now;
145 ktime_t last;
146
147 if (!pfdev->devfreq.devfreq)
148 return;
149
150 now = ktime_get();
151 last = pfdev->devfreq.time_last_update;
152
153 if (atomic_read(&pfdev->devfreq.busy_count) > 0)
154 pfdev->devfreq.busy_time += ktime_sub(now, last);
155 else
156 pfdev->devfreq.idle_time += ktime_sub(now, last);
157
158 pfdev->devfreq.time_last_update = now;
159}
160
161void panfrost_devfreq_record_busy(struct panfrost_device *pfdev)
162{
163 panfrost_devfreq_update_utilization(pfdev);
164 atomic_inc(&pfdev->devfreq.busy_count);
165}
166
167void panfrost_devfreq_record_idle(struct panfrost_device *pfdev)
168{
169 int count;
170
171 panfrost_devfreq_update_utilization(pfdev);
172 count = atomic_dec_if_positive(&pfdev->devfreq.busy_count);
173 WARN_ON(count < 0);
174}
175
