I re-checked the MIPI-CSI2 Peripheral in IMX Reference Manual. In below screenshots, there is no sign that CSI2 RX Controller supports ITU-R.BT656 protocol or not. However it supports YUV422 and RGB565 data formats and other RGB/YUV different bit combinations.
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As I mentioned in other ticket does imxrt1170 MIPI-CSI2 peripheral support serial itu-r.bt656 format?
ADV7280-M sends active YUV422 video data within a form of ITU-R.BT656 protocol packet inside. Here is the ITU-R.BT656 format structure.
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So I suspect that MIPI CSI2 RX Controller is not even aware of ITU 656 format. That is why I could not get video from adv chip. Waiting your thoughts/recommendations.