Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge back earlier cpufreq material for 6.20
+6
-209
-1
MAINTAINERS
-1
MAINTAINERS
-5
drivers/cpufreq/Kconfig.arm
-5
drivers/cpufreq/Kconfig.arm
···
141
141
The driver implements the cpufreq interface for this HW engine.
142
142
Say Y if you want to support CPUFreq HW.
143
143
144
-
config ARM_OMAP2PLUS_CPUFREQ
145
-
bool "TI OMAP2+"
146
-
depends on ARCH_OMAP2PLUS || COMPILE_TEST
147
-
default ARCH_OMAP2PLUS
148
-
149
144
config ARM_QCOM_CPUFREQ_NVMEM
150
145
tristate "Qualcomm nvmem based CPUFreq"
151
146
depends on ARCH_QCOM || COMPILE_TEST
-1
drivers/cpufreq/Makefile
-1
drivers/cpufreq/Makefile
···
69
69
obj-$(CONFIG_ARM_MEDIATEK_CPUFREQ) += mediatek-cpufreq.o
70
70
obj-$(CONFIG_ARM_MEDIATEK_CPUFREQ_HW) += mediatek-cpufreq-hw.o
71
71
obj-$(CONFIG_MACH_MVEBU_V7) += mvebu-cpufreq.o
72
-
obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
73
72
obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o
74
73
obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
75
74
obj-$(CONFIG_ARM_QCOM_CPUFREQ_HW) += qcom-cpufreq-hw.o
+6
-7
drivers/cpufreq/cpufreq.c
+6
-7
drivers/cpufreq/cpufreq.c
···
2803
2803
{
2804
2804
struct cpufreq_policy *policy;
2805
2805
unsigned long flags;
2806
-
int ret = 0;
2806
+
int ret = -EOPNOTSUPP;
2807
2807
2808
2808
/*
2809
2809
* Don't compare 'cpufreq_driver->boost_enabled' with 'state' here to
···
2820
2820
continue;
2821
2821
2822
2822
ret = policy_set_boost(policy, state);
2823
-
if (ret)
2824
-
goto err_reset_state;
2823
+
if (unlikely(ret))
2824
+
break;
2825
2825
}
2826
+
2826
2827
cpus_read_unlock();
2827
2828
2828
-
return 0;
2829
-
2830
-
err_reset_state:
2831
-
cpus_read_unlock();
2829
+
if (likely(!ret))
2830
+
return 0;
2832
2831
2833
2832
write_lock_irqsave(&cpufreq_driver_lock, flags);
2834
2833
cpufreq_driver->boost_enabled = !state;
-195
drivers/cpufreq/omap-cpufreq.c
-195
drivers/cpufreq/omap-cpufreq.c
···
1
-
// SPDX-License-Identifier: GPL-2.0-only
2
-
/*
3
-
* CPU frequency scaling for OMAP using OPP information
4
-
*
5
-
* Copyright (C) 2005 Nokia Corporation
6
-
* Written by Tony Lindgren <tony@atomide.com>
7
-
*
8
-
* Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
9
-
*
10
-
* Copyright (C) 2007-2011 Texas Instruments, Inc.
11
-
* - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
12
-
*/
13
-
14
-
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
-
16
-
#include <linux/types.h>
17
-
#include <linux/kernel.h>
18
-
#include <linux/sched.h>
19
-
#include <linux/cpufreq.h>
20
-
#include <linux/delay.h>
21
-
#include <linux/init.h>
22
-
#include <linux/err.h>
23
-
#include <linux/clk.h>
24
-
#include <linux/io.h>
25
-
#include <linux/pm_opp.h>
26
-
#include <linux/cpu.h>
27
-
#include <linux/module.h>
28
-
#include <linux/platform_device.h>
29
-
#include <linux/regulator/consumer.h>
30
-
31
-
/* OPP tolerance in percentage */
32
-
#define OPP_TOLERANCE 4
33
-
34
-
static struct cpufreq_frequency_table *freq_table;
35
-
static atomic_t freq_table_users = ATOMIC_INIT(0);
36
-
static struct device *mpu_dev;
37
-
static struct regulator *mpu_reg;
38
-
39
-
static int omap_target(struct cpufreq_policy *policy, unsigned int index)
40
-
{
41
-
int r, ret;
42
-
struct dev_pm_opp *opp;
43
-
unsigned long freq, volt = 0, volt_old = 0, tol = 0;
44
-
unsigned int old_freq, new_freq;
45
-
46
-
old_freq = policy->cur;
47
-
new_freq = freq_table[index].frequency;
48
-
49
-
freq = new_freq * 1000;
50
-
ret = clk_round_rate(policy->clk, freq);
51
-
if (ret < 0) {
52
-
dev_warn(mpu_dev,
53
-
"CPUfreq: Cannot find matching frequency for %lu\n",
54
-
freq);
55
-
return ret;
56
-
}
57
-
freq = ret;
58
-
59
-
if (mpu_reg) {
60
-
opp = dev_pm_opp_find_freq_ceil(mpu_dev, &freq);
61
-
if (IS_ERR(opp)) {
62
-
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
63
-
__func__, new_freq);
64
-
return -EINVAL;
65
-
}
66
-
volt = dev_pm_opp_get_voltage(opp);
67
-
dev_pm_opp_put(opp);
68
-
tol = volt * OPP_TOLERANCE / 100;
69
-
volt_old = regulator_get_voltage(mpu_reg);
70
-
}
71
-
72
-
dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n",
73
-
old_freq / 1000, volt_old ? volt_old / 1000 : -1,
74
-
new_freq / 1000, volt ? volt / 1000 : -1);
75
-
76
-
/* scaling up? scale voltage before frequency */
77
-
if (mpu_reg && (new_freq > old_freq)) {
78
-
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
79
-
if (r < 0) {
80
-
dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
81
-
__func__);
82
-
return r;
83
-
}
84
-
}
85
-
86
-
ret = clk_set_rate(policy->clk, new_freq * 1000);
87
-
88
-
/* scaling down? scale voltage after frequency */
89
-
if (mpu_reg && (new_freq < old_freq)) {
90
-
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
91
-
if (r < 0) {
92
-
dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
93
-
__func__);
94
-
clk_set_rate(policy->clk, old_freq * 1000);
95
-
return r;
96
-
}
97
-
}
98
-
99
-
return ret;
100
-
}
101
-
102
-
static inline void freq_table_free(void)
103
-
{
104
-
if (atomic_dec_and_test(&freq_table_users))
105
-
dev_pm_opp_free_cpufreq_table(mpu_dev, &freq_table);
106
-
}
107
-
108
-
static int omap_cpu_init(struct cpufreq_policy *policy)
109
-
{
110
-
int result;
111
-
112
-
policy->clk = clk_get(NULL, "cpufreq_ck");
113
-
if (IS_ERR(policy->clk))
114
-
return PTR_ERR(policy->clk);
115
-
116
-
if (!freq_table) {
117
-
result = dev_pm_opp_init_cpufreq_table(mpu_dev, &freq_table);
118
-
if (result) {
119
-
dev_err(mpu_dev,
120
-
"%s: cpu%d: failed creating freq table[%d]\n",
121
-
__func__, policy->cpu, result);
122
-
clk_put(policy->clk);
123
-
return result;
124
-
}
125
-
}
126
-
127
-
atomic_inc_return(&freq_table_users);
128
-
129
-
/* FIXME: what's the actual transition time? */
130
-
cpufreq_generic_init(policy, freq_table, 300 * 1000);
131
-
132
-
return 0;
133
-
}
134
-
135
-
static void omap_cpu_exit(struct cpufreq_policy *policy)
136
-
{
137
-
freq_table_free();
138
-
clk_put(policy->clk);
139
-
}
140
-
141
-
static struct cpufreq_driver omap_driver = {
142
-
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
143
-
.verify = cpufreq_generic_frequency_table_verify,
144
-
.target_index = omap_target,
145
-
.get = cpufreq_generic_get,
146
-
.init = omap_cpu_init,
147
-
.exit = omap_cpu_exit,
148
-
.register_em = cpufreq_register_em_with_opp,
149
-
.name = "omap",
150
-
};
151
-
152
-
static int omap_cpufreq_probe(struct platform_device *pdev)
153
-
{
154
-
mpu_dev = get_cpu_device(0);
155
-
if (!mpu_dev) {
156
-
pr_warn("%s: unable to get the MPU device\n", __func__);
157
-
return -EINVAL;
158
-
}
159
-
160
-
mpu_reg = regulator_get(mpu_dev, "vcc");
161
-
if (IS_ERR(mpu_reg)) {
162
-
pr_warn("%s: unable to get MPU regulator\n", __func__);
163
-
mpu_reg = NULL;
164
-
} else {
165
-
/*
166
-
* Ensure physical regulator is present.
167
-
* (e.g. could be dummy regulator.)
168
-
*/
169
-
if (regulator_get_voltage(mpu_reg) < 0) {
170
-
pr_warn("%s: physical regulator not present for MPU\n",
171
-
__func__);
172
-
regulator_put(mpu_reg);
173
-
mpu_reg = NULL;
174
-
}
175
-
}
176
-
177
-
return cpufreq_register_driver(&omap_driver);
178
-
}
179
-
180
-
static void omap_cpufreq_remove(struct platform_device *pdev)
181
-
{
182
-
cpufreq_unregister_driver(&omap_driver);
183
-
}
184
-
185
-
static struct platform_driver omap_cpufreq_platdrv = {
186
-
.driver = {
187
-
.name = "omap-cpufreq",
188
-
},
189
-
.probe = omap_cpufreq_probe,
190
-
.remove = omap_cpufreq_remove,
191
-
};
192
-
module_platform_driver(omap_cpufreq_platdrv);
193
-
194
-
MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
195
-
MODULE_LICENSE("GPL");