I believe Dolby Vision requires a hardware chip.
The HDR format war has a long way to run and it's by no means certain that Dolby Vision will even exist in a few years. The big studios don't have the power they once did, and a free open-source solution (HDR10) would appear to fit better with how the media industry is developing.
New Android 7 firmware on this forum Wednesday morning.
According to Matt McRae, CTO of Vizio (i.e. a Dolby Vision-compliant TV manufacturer), there is no specific Dolby Vision hardware chip and "Dolby Vision is a format + processing/mapping software".
Like HDR10, Dolby Vision can be implemented on a SoC (i.e. computer System-on a-Chip): the SoC is a hardware & software computer system, and the SoC hardware is not specifically designed for Dolby Vision as well as for HDR10 or any other HDR format.
However, a Dolby Vision capable SoC shall have sufficiently powerful processing due to the massive level of Dolby Vision processing.
http://www.avsforum.com/forum/465-high-dynamic-range-hdr-wide-color-gamut-wcg/2627409-universal-hdr-compliant-displays-4.html#post50302361