static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
const char *buf, size_t count)
{
int input = 0;
int bypass = 0;
int ret, cpu, reenable_timer;
struct greenmax_info_s *greenmax_info;
ret = sscanf(buf, "%d", &input);
if (ret != 1)
return -EINVAL;
if (input >= POWERSAVE_BIAS_MAXLEVEL) {
input = POWERSAVE_BIAS_MAXLEVEL;
bypass = 1;
} else if (input <= POWERSAVE_BIAS_MINLEVEL) {
input = POWERSAVE_BIAS_MINLEVEL;
bypass = 1;
}
if (input == powersave_bias) {
/* no change */
return count;
}
reenable_timer = ((powersave_bias ==
POWERSAVE_BIAS_MAXLEVEL) ||
(powersave_bias ==
POWERSAVE_BIAS_MINLEVEL));
powersave_bias = input;
if (!bypass) {
if (reenable_timer) {
/* reinstate dbs timer */
for_each_online_cpu(cpu) {
if (lock_policy_rwsem_write(cpu) < 0)
continue;
greenmax_info_s = &per_cpu(greenmax_info, cpu);
if (this_greenmax->cur_policy) {
/* restart dbs timer */
dbs_timer_init(greenmax_info_s);
}
unlock_policy_rwsem_write(cpu);
}
}
greenmax_powersave_bias_init();
} else {
static s32 cpufreq_governor_dbs(struct cpufreq_policy *policy, u32 event)
{
s32 cpu = (s32)policy->cpu;
struct cpu_dbs_info_s *dbs_info = NULL;
u32 retValue = 0;
ST_PWC_SWITCH_STRU cpufreq_control_nv = {0} ;
/*cpu 信息*/
dbs_info = &per_cpu(g_acpu_dbs_info, (u32)cpu);
/*lint --e{744 } */
switch (event) {
case CPUFREQ_GOV_START:
cpufreq_debug("CPUFREQ_GOV_START\n");
mutex_lock(&dbs_mutex);
dbs_enable++;
/*cpu 信息初始化 函数??idle_time*/
dbs_info->prev_cpu_idle = get_cpu_idle_time(0,
&dbs_info->prev_cpu_wall);
dbs_info->cur_policy = policy;
dbs_info->cpu = cpu;
dbs_info->freq_table = cpufreq_frequency_get_table((u32)cpu);
dbs_info->cpu_down_time = 0;
dbs_info->cpu_up_time = 0;
retValue = bsp_nvm_read(NV_ID_DRV_NV_PWC_SWITCH,(u8*)&cpufreq_control_nv,sizeof(ST_PWC_SWITCH_STRU));
if (NV_OK == retValue)
{
g_cpufreq_lock_status_flag = cpufreq_control_nv.dfs;
}
else
{
cpufreq_err("read nv failed %d\n", retValue);
}
if (1 == dbs_enable) {
retValue = bsp_nvm_read(NV_ID_DRV_NV_DFS_SWITCH,(u8*)&g_stDfsSwitch,sizeof(ST_PWC_DFS_STRU));
if (NV_OK != retValue)
{
cpufreq_err("read nv failed use default value\n");
g_stDfsSwitch.AcpuDownLimit = 20;
g_stDfsSwitch.AcpuDownNum = 3;
g_stDfsSwitch.AcpuUpLimit = 80;
g_stDfsSwitch.AcpuUpNum = 1;
g_stDfsSwitch.DFSTimerLen = 400;
}
dbs_tuners_ins.up_threshold = g_stDfsSwitch.AcpuUpLimit;
dbs_tuners_ins.down_threshold = g_stDfsSwitch.AcpuDownLimit;
dbs_tuners_ins.down_threshold_times = g_stDfsSwitch.AcpuDownNum;
dbs_tuners_ins.up_threshold_times = g_stDfsSwitch.AcpuUpNum;
dbs_tuners_ins.sampling_rate = g_stDfsSwitch.DFSTimerLen * 10000; /*unit:us*/
/*
* Start the timerschedule work, when this governor
* is used for first time
*/
register_icc_for_cpufreq();
dbs_timer_init(dbs_info);
}
mutex_unlock(&dbs_mutex);
break;
case CPUFREQ_GOV_STOP:
dbs_timer_exit(dbs_info);
mutex_lock(&dbs_mutex);
dbs_enable--;
mutex_unlock(&dbs_mutex);
break;
case CPUFREQ_GOV_LIMITS:
mutex_lock(&info_mutex);
dbs_info->cpu_down_time = 0;
dbs_info->cpu_up_time = 0;
mutex_unlock(&info_mutex);
if (policy->max < dbs_info->cur_policy->cur)
__cpufreq_driver_target(dbs_info->cur_policy,
policy->max, CPUFREQ_RELATION_H);
else if (policy->min > dbs_info->cur_policy->cur)
__cpufreq_driver_target(dbs_info->cur_policy,
policy->min, CPUFREQ_RELATION_L);
break;
}
return 0;
}
