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Bootloader or kernel sets CPU frequency to an initial value before cpufreq starts on rockchip platform, if cpu's opp table is modified to a specified value, it will cause an issue. For example, the initial frequency is 816MHz and voltage set by hardware is 900mV: 1. there is only one opp whose frequency is 816MHz and voltage is 850mV in opp table list, as they frequency is equal, the voltage will not be changed, it is still 900mV and a little too large relative to 850mV. 2. there is only one opp whose frequency is 1200MHz and voltage is 1100mV in opp table list, as it doesn't set voltage to 1100mV before set frequency to 1200MHz in the dev_pm_opp_set_rate function, the initial voltage 900mV cann't supply for 1200MHz, the system crash. Change-Id: Id8c5efc34d9c94ff37921b33f5a76e059240d368 Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>