We have HDMI and DVI connected to the PortB and PortA of ADV7441A, internal EDID memory
is used. We can even see the video from DVI (Port A). When HPD is toggled, I2C
waveform of DDC_SDA/DDC_SCL can be oberserved on both port seperately. But
external video source doesn't read EDID. After the source sends 0xA0 over DDC,
ADV7441 doesn't respond with an ACK. We need to figure out why ADV7441 doesn't respond to
0xA0 addressing. The DDC_SDA/SCL is connect to ADV7441A directly. It is
straightforward and suppose to work.