This source file includes following definitions.
- panfrost_devfreq_target
- panfrost_devfreq_reset
- panfrost_devfreq_get_dev_status
- panfrost_devfreq_get_cur_freq
- panfrost_devfreq_init
- panfrost_devfreq_fini
- panfrost_devfreq_resume
- panfrost_devfreq_suspend
- panfrost_devfreq_update_utilization
- panfrost_devfreq_record_transition
1
2
3 #include <linux/devfreq.h>
4 #include <linux/platform_device.h>
5 #include <linux/pm_opp.h>
6 #include <linux/clk.h>
7 #include <linux/regulator/consumer.h>
8
9 #include "panfrost_device.h"
10 #include "panfrost_devfreq.h"
11 #include "panfrost_features.h"
12 #include "panfrost_issues.h"
13 #include "panfrost_gpu.h"
14 #include "panfrost_regs.h"
15
16 static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot);
17
18 static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
19 u32 flags)
20 {
21 struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
22 struct dev_pm_opp *opp;
23 unsigned long old_clk_rate = pfdev->devfreq.cur_freq;
24 unsigned long target_volt, target_rate;
25 int err;
26
27 opp = devfreq_recommended_opp(dev, freq, flags);
28 if (IS_ERR(opp))
29 return PTR_ERR(opp);
30
31 target_rate = dev_pm_opp_get_freq(opp);
32 target_volt = dev_pm_opp_get_voltage(opp);
33 dev_pm_opp_put(opp);
34
35 if (old_clk_rate == target_rate)
36 return 0;
37
38
39
40
41
42 if (old_clk_rate < target_rate) {
43 err = regulator_set_voltage(pfdev->regulator, target_volt,
44 target_volt);
45 if (err) {
46 dev_err(dev, "Cannot set voltage %lu uV\n",
47 target_volt);
48 return err;
49 }
50 }
51
52 err = clk_set_rate(pfdev->clock, target_rate);
53 if (err) {
54 dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
55 err);
56 if (pfdev->regulator)
57 regulator_set_voltage(pfdev->regulator,
58 pfdev->devfreq.cur_volt,
59 pfdev->devfreq.cur_volt);
60 return err;
61 }
62
63 if (old_clk_rate > target_rate) {
64 err = regulator_set_voltage(pfdev->regulator, target_volt,
65 target_volt);
66 if (err)
67 dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
68 }
69
70 pfdev->devfreq.cur_freq = target_rate;
71 pfdev->devfreq.cur_volt = target_volt;
72
73 return 0;
74 }
75
76 static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
77 {
78 ktime_t now = ktime_get();
79 int i;
80
81 for (i = 0; i < NUM_JOB_SLOTS; i++) {
82 pfdev->devfreq.slot[i].busy_time = 0;
83 pfdev->devfreq.slot[i].idle_time = 0;
84 pfdev->devfreq.slot[i].time_last_update = now;
85 }
86 }
87
88 static int panfrost_devfreq_get_dev_status(struct device *dev,
89 struct devfreq_dev_status *status)
90 {
91 struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
92 int i;
93
94 for (i = 0; i < NUM_JOB_SLOTS; i++) {
95 panfrost_devfreq_update_utilization(pfdev, i);
96 }
97
98 status->current_frequency = clk_get_rate(pfdev->clock);
99 status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.slot[0].busy_time,
100 pfdev->devfreq.slot[0].idle_time));
101
102 status->busy_time = 0;
103 for (i = 0; i < NUM_JOB_SLOTS; i++) {
104 status->busy_time += ktime_to_ns(pfdev->devfreq.slot[i].busy_time);
105 }
106
107
108
109
110 panfrost_devfreq_reset(pfdev);
111
112 dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
113 status->total_time,
114 status->busy_time / (status->total_time / 100),
115 status->current_frequency / 1000 / 1000);
116
117 return 0;
118 }
119
120 static int panfrost_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
121 {
122 struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
123
124 *freq = pfdev->devfreq.cur_freq;
125
126 return 0;
127 }
128
129 static struct devfreq_dev_profile panfrost_devfreq_profile = {
130 .polling_ms = 50,
131 .target = panfrost_devfreq_target,
132 .get_dev_status = panfrost_devfreq_get_dev_status,
133 .get_cur_freq = panfrost_devfreq_get_cur_freq,
134 };
135
136 int panfrost_devfreq_init(struct panfrost_device *pfdev)
137 {
138 int ret;
139 struct dev_pm_opp *opp;
140
141 ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
142 if (ret == -ENODEV)
143 return 0;
144 else if (ret)
145 return ret;
146
147 panfrost_devfreq_reset(pfdev);
148
149 pfdev->devfreq.cur_freq = clk_get_rate(pfdev->clock);
150
151 opp = devfreq_recommended_opp(&pfdev->pdev->dev, &pfdev->devfreq.cur_freq, 0);
152 if (IS_ERR(opp))
153 return PTR_ERR(opp);
154
155 panfrost_devfreq_profile.initial_freq = pfdev->devfreq.cur_freq;
156 dev_pm_opp_put(opp);
157
158 pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
159 &panfrost_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
160 NULL);
161 if (IS_ERR(pfdev->devfreq.devfreq)) {
162 DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
163 ret = PTR_ERR(pfdev->devfreq.devfreq);
164 pfdev->devfreq.devfreq = NULL;
165 dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
166 return ret;
167 }
168
169 return 0;
170 }
171
172 void panfrost_devfreq_fini(struct panfrost_device *pfdev)
173 {
174 dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
175 }
176
177 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
178 {
179 int i;
180
181 if (!pfdev->devfreq.devfreq)
182 return;
183
184 panfrost_devfreq_reset(pfdev);
185 for (i = 0; i < NUM_JOB_SLOTS; i++)
186 pfdev->devfreq.slot[i].busy = false;
187
188 devfreq_resume_device(pfdev->devfreq.devfreq);
189 }
190
191 void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
192 {
193 if (!pfdev->devfreq.devfreq)
194 return;
195
196 devfreq_suspend_device(pfdev->devfreq.devfreq);
197 }
198
199 static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot)
200 {
201 struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
202 ktime_t now;
203 ktime_t last;
204
205 if (!pfdev->devfreq.devfreq)
206 return;
207
208 now = ktime_get();
209 last = pfdev->devfreq.slot[slot].time_last_update;
210
211
212 if (devfreq_slot->busy)
213 pfdev->devfreq.slot[slot].busy_time += ktime_sub(now, last);
214 else
215 pfdev->devfreq.slot[slot].idle_time += ktime_sub(now, last);
216
217 pfdev->devfreq.slot[slot].time_last_update = now;
218 }
219
220
221 void panfrost_devfreq_record_transition(struct panfrost_device *pfdev, int slot)
222 {
223 struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
224
225 panfrost_devfreq_update_utilization(pfdev, slot);
226 devfreq_slot->busy = !devfreq_slot->busy;
227 }