Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

系統中有三張CPU相關的頻率表:

1. rockchip-cpufreq.c:

/* Frequency table index must be sequential starting at 0 */ static struct cpufreq_frequency_table default_freq_table[] = {{.frequency = 312 * 1000, .index = 875 * 1000},{.frequency = 504 * 1000, .index = 925 * 1000},{.frequency = 816 * 1000, .index = 975 * 1000},{.frequency = 1008 * 1000, .index = 1075 * 1000},{.frequency = 1200 * 1000, .index = 1150 * 1000},{.frequency = 1416 * 1000, .index = 1250 * 1000},{.frequency = 1608 * 1000, .index = 1350 * 1000},{.frequency = CPUFREQ_TABLE_END}, }; static struct cpufreq_frequency_table *freq_table = default_freq_table;

2. rk3288.dtsi:

&clk_core_dvfs_table {operating-points = </* KHz uV */126000 900000216000 900000312000 900000408000 900000600000 900000696000 950000816000 10000001008000 10500001200000 11000001416000 12000001512000 13000001608000 1350000// 1704000 1350000// 1800000 1400000>;//......};

3. rk3288.dtsi:

&clk_core_dvfs_table {//......support-pvtm = <1>;pvtm-operating-points = </* KHz uV margin(uV)*/126000 900000 25000216000 900000 25000312000 900000 25000408000 900000 25000600000 900000 25000696000 950000 25000816000 1000000 250001008000 1050000 250001200000 1100000 250001416000 1200000 250001512000 1300000 250001608000 1350000 25000>;status="okay";};

最終用的是第三張.

---

代碼調用:

第一張表被覆蓋的地方:
dvfs.c:

static int cpufreq_init_cpu0(struct cpufreq_policy *policy) {freq_table = dvfs_get_freq_volt_table(clk_cpu_dvfs_node); } struct cpufreq_frequency_table *dvfs_get_freq_volt_table(struct dvfs_node *clk_dvfs_node) {struct cpufreq_frequency_table *table;if (!clk_dvfs_node)return NULL;mutex_lock(&clk_dvfs_node->vd->mutex);table = clk_dvfs_node->dvfs_table;mutex_unlock(&clk_dvfs_node->vd->mutex);return table; }

第二張表被覆蓋的地方:

int clk_enable_dvfs(struct dvfs_node *clk_dvfs_node) {if (clk_dvfs_node->support_pvtm)pvtm_set_dvfs_table(clk_dvfs_node); }

總結

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