forked from jonsmirl/mpc5200
/
Kconfig
227 lines (183 loc) · 7.18 KB
/
Kconfig
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
219
220
221
222
223
224
225
226
227
config CPU_FREQ
bool "CPU Frequency scaling"
help
CPU Frequency scaling allows you to change the clock speed of
CPUs on the fly. This is a nice method to save power, because
the lower the CPU clock speed, the less power the CPU consumes.
Note that this driver doesn't automatically change the CPU
clock speed, you need to either enable a dynamic cpufreq governor
(see below) after boot, or use a userspace tool.
For details, take a look at <file:Documentation/cpu-freq>.
If in doubt, say N.
if CPU_FREQ
config CPU_FREQ_TABLE
tristate
config CPU_FREQ_DEBUG
bool "Enable CPUfreq debugging"
help
Say Y here to enable CPUfreq subsystem (including drivers)
debugging. You will need to activate it via the kernel
command line by passing
cpufreq.debug=<value>
To get <value>, add
1 to activate CPUfreq core debugging,
2 to activate CPUfreq drivers debugging, and
4 to activate CPUfreq governor debugging
config CPU_FREQ_LOG
bool "Enable CPUfreq transition log"
help
Say Y here to enable CPUfreq log on running
config CPU_FREQ_STAT
tristate "CPU frequency translation statistics"
select CPU_FREQ_TABLE
default y
help
This driver exports CPU frequency statistics information through sysfs
file system.
To compile this driver as a module, choose M here: the
module will be called cpufreq_stats.
If in doubt, say N.
config CPU_FREQ_STAT_DETAILS
bool "CPU frequency translation statistics details"
depends on CPU_FREQ_STAT
help
This will show detail CPU frequency translation table in sysfs file
system.
If in doubt, say N.
choice
prompt "Default CPUFreq governor"
default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
help
This option sets which CPUFreq governor shall be loaded at
startup. If in doubt, select 'performance'.
config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
bool "performance"
select CPU_FREQ_GOV_PERFORMANCE
help
Use the CPUFreq governor 'performance' as default. This sets
the frequency statically to the highest frequency supported by
the CPU.
config CPU_FREQ_DEFAULT_GOV_POWERSAVE
bool "powersave"
depends on EMBEDDED
select CPU_FREQ_GOV_POWERSAVE
help
Use the CPUFreq governor 'powersave' as default. This sets
the frequency statically to the lowest frequency supported by
the CPU.
config CPU_FREQ_DEFAULT_GOV_USERSPACE
bool "userspace"
select CPU_FREQ_GOV_USERSPACE
help
Use the CPUFreq governor 'userspace' as default. This allows
you to set the CPU frequency manually or when a userspace
program shall be able to set the CPU dynamically without having
to enable the userspace governor manually.
config CPU_FREQ_DEFAULT_GOV_ONDEMAND
bool "ondemand"
select CPU_FREQ_GOV_ONDEMAND
select CPU_FREQ_GOV_PERFORMANCE
help
Use the CPUFreq governor 'ondemand' as default. This allows
you to get a full dynamic frequency capable system by simply
loading your cpufreq low-level hardware driver.
Be aware that not all cpufreq drivers support the ondemand
governor. If unsure have a look at the help section of the
driver. Fallback governor will be the performance governor.
config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
bool "conservative"
select CPU_FREQ_GOV_CONSERVATIVE
select CPU_FREQ_GOV_PERFORMANCE
help
Use the CPUFreq governor 'conservative' as default. This allows
you to get a full dynamic frequency capable system by simply
loading your cpufreq low-level hardware driver.
Be aware that not all cpufreq drivers support the conservative
governor. If unsure have a look at the help section of the
driver. Fallback governor will be the performance governor.
config CPU_FREQ_DEFAULT_GOV_INTERACTIVE
bool "interactive"
select CPU_FREQ_GOV_INTERACTIVE
help
Use the 'interactive' governor as default. This gets full cpu frequency
scaling for workloads that are latency sensitive, typically interactive
workloads..
endchoice
config CPU_FREQ_GOV_PERFORMANCE
tristate "'performance' governor"
help
This cpufreq governor sets the frequency statically to the
highest available CPU frequency.
To compile this driver as a module, choose M here: the
module will be called cpufreq_performance.
If in doubt, say Y.
config CPU_FREQ_GOV_POWERSAVE
tristate "'powersave' governor"
help
This cpufreq governor sets the frequency statically to the
lowest available CPU frequency.
To compile this driver as a module, choose M here: the
module will be called cpufreq_powersave.
If in doubt, say Y.
config CPU_FREQ_GOV_USERSPACE
tristate "'userspace' governor for userspace frequency scaling"
help
Enable this cpufreq governor when you either want to set the
CPU frequency manually or when a userspace program shall
be able to set the CPU dynamically, like on LART
<http://www.lartmaker.nl/>.
To compile this driver as a module, choose M here: the
module will be called cpufreq_userspace.
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say Y.
config CPU_FREQ_GOV_ONDEMAND
tristate "'ondemand' cpufreq policy governor"
select CPU_FREQ_TABLE
help
'ondemand' - This driver adds a dynamic cpufreq policy governor.
The governor does a periodic polling and
changes frequency based on the CPU utilization.
The support for this governor depends on CPU capability to
do fast frequency switching (i.e, very low latency frequency
transitions).
To compile this driver as a module, choose M here: the
module will be called cpufreq_ondemand.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config CPU_FREQ_GOV_INTERACTIVE
tristate "'interactive' cpufreq policy governor"
help
'interactive' - This driver adds a dynamic cpufreq policy governor.
Designed for low latency burst workloads. Scaling it done when coming
out of idle instead of polling.
config CPU_FREQ_GOV_CONSERVATIVE
tristate "'conservative' cpufreq governor"
depends on CPU_FREQ
help
'conservative' - this driver is rather similar to the 'ondemand'
governor both in its source code and its purpose, the difference is
its optimisation for better suitability in a battery powered
environment. The frequency is gracefully increased and decreased
rather than jumping to 100% when speed is required.
If you have a desktop machine then you should really be considering
the 'ondemand' governor instead, however if you are using a laptop,
PDA or even an AMD64 based computer (due to the unacceptable
step-by-step latency issues between the minimum and maximum frequency
transitions in the CPU) you will probably want to use this governor.
To compile this driver as a module, choose M here: the
module will be called cpufreq_conservative.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config CPU_FREQ_MIN_TICKS
int "Ticks between governor polling interval."
default 10
help
Minimum number of ticks between polling interval for governors.
config CPU_FREQ_SAMPLING_LATENCY_MULTIPLIER
int "Sampling rate multiplier for governors."
default 1000
help
Sampling latency rate multiplied by the cpu switch latency.
Affects governor polling.
endif # CPU_FREQ