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一、目录结构

核心内容是 cpufreq_oppidx 可用查看不同频率对应的电压，电压越低越省电。

注意电压要设置在芯片规格范围内

Z91:/proc/cpufreq # ls -allls -alltotal 0dr-xr-xr-x   3 root   root   0 2018-01-12 17:08 .dr-xr-xr-x 432 root   root   0 1970-01-01 08:00 ..dr-xr-xr-x   2 root   root   0 2018-01-12 17:08 MT_CPU_DVFS_LL-rw-rw-r--   1 root   root   0 2018-01-12 17:08 cpufreq_debug-rw-rw-r--   1 root   root   0 2018-01-12 17:08 cpufreq_dvfs_time_profile-rw-rw----   1 system system 0 2018-01-12 17:08 cpufreq_power_mode-rw-rw-r--   1 root   root   0 2018-01-12 17:08 cpufreq_sched_disable-rw-rw-r--   1 root   root   0 2018-01-12 17:08 cpufreq_stress_test

1.MT_CPU_DVFS_LL

目录结构

Z91:/proc/cpufreq/MT_CPU_DVFS_LL # ls -alls -altotal 0dr-xr-xr-x 2 root root 0 2018-01-12 17:09 .dr-xr-xr-x 3 root root 0 2018-01-12 17:08 ..-rw-rw-r-- 1 root root 0 2018-01-12 17:09 cpufreq_freq-rw-rw-r-- 1 root root 0 2018-01-12 17:09 cpufreq_oppidx-rw-rw-r-- 1 root root 0 2018-01-12 17:09 cpufreq_turbo_mode-rw-rw-r-- 1 root root 0 2018-01-12 17:09 cpufreq_volt

1.1 /proc/cpufreq/MT_CPU_DVFS_LL/cpufreq_freq

当前频率

Z91:/proc/cpufreq/MT_CPU_DVFS_LL # cat cpufreq_freqcat cpufreq_freq299000 KHzZ91:/proc/cpufreq/MT_CPU_DVFS_LL #

1.2 /proc/cpufreq/MT_CPU_DVFS_LL/cpufreq_oppidx

不同频率对于的电压

Z91:/proc/cpufreq/MT_CPU_DVFS_LL # cat cpufreq_oppidxcat cpufreq_oppidx[MT_CPU_DVFS_LL/0]cpufreq_oppidx = 0        0  (1274000, 118750)        1  (1235000, 118125)        2  (1196000, 116875)        3  (1170000, 116875)        4  (1105000, 115000)        5  (1053000, 113750)        6  (1001000, 112500)        7  (962000, 111875)        8  (910000, 110000)        9  (845000, 108750)        10 (702000, 105000)        11 (624000, 103125)        12 (546000, 101250)        13 (416000, 98125)        14 (338000, 96250)        15 (299000, 95000)===========================================Z91:/proc/gpufreq # cat gpufreq_opp_dumpcat gpufreq_opp_dump[0] freq = 450000, volt = 115000, idx = 0[1] freq = 400000, volt = 111875, idx = 1[2] freq = 350000, volt = 108750, idx = 2[3] freq = 290000, volt = 105000, idx = 3

1.3 /proc/cpufreq/MT_CPU_DVFS_LL/cpufreq_turbo_mode

无数据

1.4 /proc/cpufreq/MT_CPU_DVFS_LL/cpufreq_volt

Z91:/proc/cpufreq/MT_CPU_DVFS_LL # cat cpufreq_voltcat cpufreq_voltVproc: 950000 uVVsram: 1150000 uV

2.cpufreq_debug

Z91:/proc/cpufreq # cat cpufreq_debugcat cpufreq_debugcpufreq debug (log level) = 0

3.cpufreq_dvfs_time_profile

Z91:/proc/cpufreq # cat cpufreq_dvfs_time_profilecat cpufreq_dvfs_time_profilemax[0] = 30970 usmax[1] = 18437 usmax[2] = 0 usmax[3] = 0 usmax[4] = 0 usmax[5] = 0 us

4.cpufreq_power_mode

Z91:/proc/cpufreq # cat cpufreq_power_modecat cpufreq_power_modeDefault(Normal) mode

5.cpufreq_sched_disable

Z91:/proc/cpufreq # cat cpufreq_sched_disablecat cpufreq_sched_disablecpufreq_sched_disable = 1

6.cpufreq_stress_test

Z91:/proc/cpufreq # cat cpufreq_stress_testcat cpufreq_stress_test0

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