We are using the ADV7511 to provide HDMI video+audio for a computing device.
This works fine for 480p 60Hz and for 576p 50Hz, if we have no audio.
However, if we enable the SPDIF audio (at any sample rate), then the 576p 50Hz video mode stops working, i.e., the monitor acts as though there is no signal.
This does not occur if we are using the 480p 60Hz video mode.
ADV7511 I2C main map register values:
Is this a known errata, or is there something Bleeding Obvious that we haven't got right?
Any suggestions of leads to follow up would be most appreciated.
Ok: Nothing like asking for help to help you work out the solution yourself: In the PAL video mode, the video source was providing non-blank video in the first line of the VSYNC period, which seems to really confuse the ADV7511. I fixed that underlying problem, and now it is working just fine.
In short: Check that your video has no pixel data being sent during VSYNC.