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i.mx8m HDMI problem

Question asked by Antonio Bardi on Apr 20, 2020
Latest reply on Apr 22, 2020 by Antonio Bardi

On a custom board equipped with an IMX.8 CPU I cannot make HDMI work. The issue is that upon insertion of HDMI cable and assertion of HDMI_HPD (high, 3.3V), the CPU does not start DDC communication with the Display on HDMI_DDC_SCL and HDMI_DDC_SDA pins. Internal HDMI supply (VDD_PHY1V8) is 1.8V stable. The Problem is not in the CPU module as HDMI works in its Development Kit.
Is there a way to check the status of HDMI_HPD pin? Wich register should I read?
Any help would be very much appreciated.

-Antonio-

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