We've encountered an issue where the imx6 is unable to successfully establish a secure HDCP link when the HDMI transmitter is operating in DVI mode. What appears to happen is that the HDCP negotiation process is performed and then shortly thereafter the secure connection is lost. This will repeat over and over every couple of seconds (corresponding closely with the typical HDCP link verification interval). When the HDMI link is operating in HDMI mode, everything works properly.
Any help would be greatly appreciated.