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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Collabora ltd. */
#include <linux/devfreq.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include "panfrost_device.h"
#include "panfrost_features.h"
#include "panfrost_issues.h"
#include "panfrost_gpu.h"
#include "panfrost_regs.h"
static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot);
static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
struct dev_pm_opp *opp;
unsigned long old_clk_rate = pfdev->devfreq.cur_freq;
unsigned long target_volt, target_rate;
int err;
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp))
return PTR_ERR(opp);
target_rate = dev_pm_opp_get_freq(opp);
target_volt = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
if (old_clk_rate == target_rate)
return 0;
/*
* If frequency scaling from low to high, adjust voltage first.
* If frequency scaling from high to low, adjust frequency first.
*/
if (old_clk_rate < target_rate) {
err = regulator_set_voltage(pfdev->regulator, target_volt,
target_volt);
if (err) {
dev_err(dev, "Cannot set voltage %lu uV\n",
target_volt);
return err;
}
}
err = clk_set_rate(pfdev->clock, target_rate);
if (err) {
dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
err);
regulator_set_voltage(pfdev->regulator, pfdev->devfreq.cur_volt,
pfdev->devfreq.cur_volt);
return err;
}
if (old_clk_rate > target_rate) {
err = regulator_set_voltage(pfdev->regulator, target_volt,
target_volt);
if (err)
dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
}
pfdev->devfreq.cur_freq = target_rate;
pfdev->devfreq.cur_volt = target_volt;
return 0;
}
static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
{
ktime_t now = ktime_get();
int i;
for (i = 0; i < NUM_JOB_SLOTS; i++) {
pfdev->devfreq.slot[i].busy_time = 0;
pfdev->devfreq.slot[i].idle_time = 0;
pfdev->devfreq.slot[i].time_last_update = now;
}
}
static int panfrost_devfreq_get_dev_status(struct device *dev,
struct devfreq_dev_status *status)
{
struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
int i;
for (i = 0; i < NUM_JOB_SLOTS; i++) {
panfrost_devfreq_update_utilization(pfdev, i);
}
status->current_frequency = clk_get_rate(pfdev->clock);
status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.slot[0].busy_time,
pfdev->devfreq.slot[0].idle_time));
status->busy_time = 0;
for (i = 0; i < NUM_JOB_SLOTS; i++) {
status->busy_time += ktime_to_ns(pfdev->devfreq.slot[i].busy_time);
}
/* We're scheduling only to one core atm, so don't divide for now */
/* status->busy_time /= NUM_JOB_SLOTS; */
panfrost_devfreq_reset(pfdev);
dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
status->total_time,
status->busy_time / (status->total_time / 100),
status->current_frequency / 1000 / 1000);
return 0;
}
static int panfrost_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
{
struct panfrost_device *pfdev = platform_get_drvdata(to_platform_device(dev));
*freq = pfdev->devfreq.cur_freq;
return 0;
}
static struct devfreq_dev_profile panfrost_devfreq_profile = {
.polling_ms = 50, /* ~3 frames */
.target = panfrost_devfreq_target,
.get_dev_status = panfrost_devfreq_get_dev_status,
.get_cur_freq = panfrost_devfreq_get_cur_freq,
};
int panfrost_devfreq_init(struct panfrost_device *pfdev)
{
int ret;
struct dev_pm_opp *opp;
if (!pfdev->regulator)
return 0;
ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
if (ret == -ENODEV) /* Optional, continue without devfreq */
return 0;
panfrost_devfreq_reset(pfdev);
pfdev->devfreq.cur_freq = clk_get_rate(pfdev->clock);
opp = devfreq_recommended_opp(&pfdev->pdev->dev, &pfdev->devfreq.cur_freq, 0);
if (IS_ERR(opp))
return PTR_ERR(opp);
panfrost_devfreq_profile.initial_freq = pfdev->devfreq.cur_freq;
dev_pm_opp_put(opp);
pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
&panfrost_devfreq_profile, "simple_ondemand", NULL);
if (IS_ERR(pfdev->devfreq.devfreq)) {
DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
ret = PTR_ERR(pfdev->devfreq.devfreq);
pfdev->devfreq.devfreq = NULL;
return ret;
}
return 0;
}
void panfrost_devfreq_resume(struct panfrost_device *pfdev)
{
int i;
if (!pfdev->devfreq.devfreq)
return;
panfrost_devfreq_reset(pfdev);
for (i = 0; i < NUM_JOB_SLOTS; i++)
pfdev->devfreq.slot[i].busy = false;
devfreq_resume_device(pfdev->devfreq.devfreq);
}
void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
{
if (!pfdev->devfreq.devfreq)
return;
devfreq_suspend_device(pfdev->devfreq.devfreq);
}
static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev, int slot)
{
struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
ktime_t now;
ktime_t last;
if (!pfdev->devfreq.devfreq)
return;
now = ktime_get();
last = pfdev->devfreq.slot[slot].time_last_update;
/* If we last recorded a transition to busy, we have been idle since */
if (devfreq_slot->busy)
pfdev->devfreq.slot[slot].busy_time += ktime_sub(now, last);
else
pfdev->devfreq.slot[slot].idle_time += ktime_sub(now, last);
pfdev->devfreq.slot[slot].time_last_update = now;
}
/* The job scheduler is expected to call this at every transition busy <-> idle */
void panfrost_devfreq_record_transition(struct panfrost_device *pfdev, int slot)
{
struct panfrost_devfreq_slot *devfreq_slot = &pfdev->devfreq.slot[slot];
panfrost_devfreq_update_utilization(pfdev, slot);
devfreq_slot->busy = !devfreq_slot->busy;
}
|
