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SK-TDA4VM: Changing CSI MUX dataline with SYSFS. - not working?

Part Number: SK-TDA4VM

Tool/software:

Hi, experts

I want to change CSI MUX dataline from A port to B port with SYSFS Cmd

I performed like this but the signal on the MUX_SEL_2 won't latch up to high. 

# cd /sys/class/gpio/

# gpioset gpiochip1 88=1


First, is it correct to set GPIO like the above? 
Second, is there other way to set B-port in SK-TDA4VM?