1
2
3
4#include <linux/clk.h>
5#include <linux/devfreq.h>
6#include <linux/devfreq_cooling.h>
7#include <linux/platform_device.h>
8#include <linux/pm_opp.h>
9
10#include "panfrost_device.h"
11#include "panfrost_devfreq.h"
12
13static void panfrost_devfreq_update_utilization(struct panfrost_devfreq *pfdevfreq)
14{
15 ktime_t now, last;
16
17 now = ktime_get();
18 last = pfdevfreq->time_last_update;
19
20 if (pfdevfreq->busy_count > 0)
21 pfdevfreq->busy_time += ktime_sub(now, last);
22 else
23 pfdevfreq->idle_time += ktime_sub(now, last);
24
25 pfdevfreq->time_last_update = now;
26}
27
28static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
29 u32 flags)
30{
31 struct dev_pm_opp *opp;
32
33 opp = devfreq_recommended_opp(dev, freq, flags);
34 if (IS_ERR(opp))
35 return PTR_ERR(opp);
36 dev_pm_opp_put(opp);
37
38 return dev_pm_opp_set_rate(dev, *freq);
39}
40
41static void panfrost_devfreq_reset(struct panfrost_devfreq *pfdevfreq)
42{
43 pfdevfreq->busy_time = 0;
44 pfdevfreq->idle_time = 0;
45 pfdevfreq->time_last_update = ktime_get();
46}
47
48static int panfrost_devfreq_get_dev_status(struct device *dev,
49 struct devfreq_dev_status *status)
50{
51 struct panfrost_device *pfdev = dev_get_drvdata(dev);
52 struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
53 unsigned long irqflags;
54
55 status->current_frequency = clk_get_rate(pfdev->clock);
56
57 spin_lock_irqsave(&pfdevfreq->lock, irqflags);
58
59 panfrost_devfreq_update_utilization(pfdevfreq);
60
61 status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
62 pfdevfreq->idle_time));
63
64 status->busy_time = ktime_to_ns(pfdevfreq->busy_time);
65
66 panfrost_devfreq_reset(pfdevfreq);
67
68 spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
69
70 dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
71 status->busy_time, status->total_time,
72 status->busy_time / (status->total_time / 100),
73 status->current_frequency / 1000 / 1000);
74
75 return 0;
76}
77
78static struct devfreq_dev_profile panfrost_devfreq_profile = {
79 .timer = DEVFREQ_TIMER_DELAYED,
80 .polling_ms = 50,
81 .target = panfrost_devfreq_target,
82 .get_dev_status = panfrost_devfreq_get_dev_status,
83};
84
85int panfrost_devfreq_init(struct panfrost_device *pfdev)
86{
87 int ret;
88 struct dev_pm_opp *opp;
89 unsigned long cur_freq;
90 struct device *dev = &pfdev->pdev->dev;
91 struct devfreq *devfreq;
92 struct thermal_cooling_device *cooling;
93 struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
94
95 if (pfdev->comp->num_supplies > 1) {
96
97
98
99
100 DRM_DEV_INFO(dev, "More than 1 supply is not supported yet\n");
101 return 0;
102 }
103
104 ret = devm_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
105 pfdev->comp->num_supplies);
106 if (ret) {
107
108 if (ret != -ENODEV) {
109 if (ret != -EPROBE_DEFER)
110 DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
111 return ret;
112 }
113 }
114
115 ret = devm_pm_opp_of_add_table(dev);
116 if (ret) {
117
118 if (ret == -ENODEV)
119 ret = 0;
120 return ret;
121 }
122 pfdevfreq->opp_of_table_added = true;
123
124 spin_lock_init(&pfdevfreq->lock);
125
126 panfrost_devfreq_reset(pfdevfreq);
127
128 cur_freq = clk_get_rate(pfdev->clock);
129
130 opp = devfreq_recommended_opp(dev, &cur_freq, 0);
131 if (IS_ERR(opp))
132 return PTR_ERR(opp);
133
134 panfrost_devfreq_profile.initial_freq = cur_freq;
135 dev_pm_opp_put(opp);
136
137
138
139
140
141 pfdevfreq->gov_data.upthreshold = 45;
142 pfdevfreq->gov_data.downdifferential = 5;
143
144 devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
145 DEVFREQ_GOV_SIMPLE_ONDEMAND,
146 &pfdevfreq->gov_data);
147 if (IS_ERR(devfreq)) {
148 DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
149 return PTR_ERR(devfreq);
150 }
151 pfdevfreq->devfreq = devfreq;
152
153 cooling = devfreq_cooling_em_register(devfreq, NULL);
154 if (IS_ERR(cooling))
155 DRM_DEV_INFO(dev, "Failed to register cooling device\n");
156 else
157 pfdevfreq->cooling = cooling;
158
159 return 0;
160}
161
162void panfrost_devfreq_fini(struct panfrost_device *pfdev)
163{
164 struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
165
166 if (pfdevfreq->cooling) {
167 devfreq_cooling_unregister(pfdevfreq->cooling);
168 pfdevfreq->cooling = NULL;
169 }
170}
171
172void panfrost_devfreq_resume(struct panfrost_device *pfdev)
173{
174 struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
175
176 if (!pfdevfreq->devfreq)
177 return;
178
179 panfrost_devfreq_reset(pfdevfreq);
180
181 devfreq_resume_device(pfdevfreq->devfreq);
182}
183
184void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
185{
186 struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
187
188 if (!pfdevfreq->devfreq)
189 return;
190
191 devfreq_suspend_device(pfdevfreq->devfreq);
192}
193
194void panfrost_devfreq_record_busy(struct panfrost_devfreq *pfdevfreq)
195{
196 unsigned long irqflags;
197
198 if (!pfdevfreq->devfreq)
199 return;
200
201 spin_lock_irqsave(&pfdevfreq->lock, irqflags);
202
203 panfrost_devfreq_update_utilization(pfdevfreq);
204
205 pfdevfreq->busy_count++;
206
207 spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
208}
209
210void panfrost_devfreq_record_idle(struct panfrost_devfreq *pfdevfreq)
211{
212 unsigned long irqflags;
213
214 if (!pfdevfreq->devfreq)
215 return;
216
217 spin_lock_irqsave(&pfdevfreq->lock, irqflags);
218
219 panfrost_devfreq_update_utilization(pfdevfreq);
220
221 WARN_ON(--pfdevfreq->busy_count < 0);
222
223 spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
224}
225