Low power HDMI 1.2 Compliant AD9889B Tx configured as slave (default) not detected by the I2c bus interfaced to McASP0 .
Make sure your address is not shifted by a bit.
Make sure you're connected to the correct I2C port, not the DDC port. Not likely but it has happened before.
Make sure the voltage levels and speed are correct.
Other than that it should respond as a standard I2C interface and as outlined in the attached document.