Perhaps your friend @AVR Enthu can give more insight, but as I understand it there are a few companies building HDMI chipsets now, not just the single original Panasonic Solutions that created the whole mess up front.
Yes, a few companies produce them, such as Cypress Tech, Analog Devices, Diodes, Parade Tech, etc.
It is not clear whether Panasonic Solutions created the whole mess. Engineers from AVR vendors also need to know which features exactly they are looking for for their devices. There are several types of chips with different features.
It will be interesting to find out what Onkyo and SU are using, as well as Yamaha right now.
Onkyo most probably uses Analog Devices. Yamaha, dunno, until someone unscrews those heat sinks and exposes chip's serial number. Someone should do a complete teardown, so that we can find out.
The ADV7672 is a High-Definition Multimedia Interface (HDMI®) transceiver with crosspoint matrix switch, video mirror, video split, and video merge capabilities.The ADV7672 supports 40 Gbps fixed rate link (FRL) and 18 Gbps transition minimized differential signaling (TMDS) video rates and...
www.analog.com