isst_read_pm_config
if (isst_read_pm_config(&id, &cp_state, &cp_cap)) {
if (!isst_read_pm_config(id, &cp_state, &cp_cap)) {
isst_read_pm_config(id, &cp_state, &cp_cap);
ret = isst_read_pm_config(id, &cp_state, &cp_cap);
extern int isst_read_pm_config(struct isst_id *id, int *cp_state, int *cp_cap);