我把内核打印的输出级别调整到8，发现如下打印不停的输出，
为啥会这样不停的调整OPP，速度太快了，需要怎么去调整。
[20878.299051] cpu cpu0: ti_opp_supply_set_opp: switching OPP: 1500000000 Hz --> 1000000000 Hz
[20878.308655] cpu cpu0: vbb scaling to 1060000uV[min 850000uV max 1500000uV]
[20878.316536] cpu cpu0: vdd scaling to 1070000uV[min 1070000uV max 1500000uV]
[20878.330826] cpu cpu0: dev_pm_opp_set_rate: switching OPP: 1000000000 Hz --> 1500000000 Hz
[20878.339044] cpu cpu0: vdd scaling to 1189000uV[min 1189000uV max 1500000uV]
[20878.347037] cpu cpu0: vbb scaling to 1210000uV[min 950000uV max 1500000uV]
[20878.354005] cpu cpu0: ti_opp_supply_set_opp: switching OPP: 1000000000 Hz --> 1500000000 Hz
[20878.390794] cpu cpu0: dev_pm_opp_set_rate: switching OPP: 1500000000 Hz --> 1000000000 Hz
[20878.399047] cpu cpu0: ti_opp_supply_set_opp: switching OPP: 1500000000 Hz --> 1000000000 Hz
[20878.408759] cpu cpu0: vbb scaling to 1060000uV[min 850000uV max 1500000uV]
[20878.416680] cpu cpu0: vdd scaling to 1070000uV[min 1070000uV max 1500000uV]
[20878.425152] cpu cpu0: dev_pm_opp_set_rate: switching OPP: 1000000000 Hz --> 1500000000 Hz
