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TMDS1204: TMDS HPD_IN and HPD_OUT in sink application

Part Number: TMDS1204

Hi Team,

I am using TMDS1204 in my design. I2C communication is not responding.  Also HPD_IN connection following same as application circuit given in datasheet. I.e. HPD_IN is connected to connector with pull up of 5V (hdmi connector not on board 5V). If I connect loopback cable then I2C starts responding. So below are my queries

1. Is there any relation between HPD_IN and I2C bus to be active?

2. In sink application, HPD_signa is output from SoC. So What is exact HPD_IN and HPD_OUT connection if I use TMDS1204 as sink application? I believe HPD_IN should drive by SoC and HPD_OUT should connect to HDMI RX connector. 

Also attached my circuit diagram for your reviewTMDS1204_schematics.pdf

Thanks,

Venkatesh