Enable fp16 scanout on DCE 8 and DCE 10

Mario Kleiner mario.kleiner.de at gmail.com
Sun Jun 7 04:05:56 UTC 2020

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So i'm sending these on the off-chance that DCE-8/10 do
support fp16 scanout without hw bugs. Would be nice to
enable this if it is supported, even if the hw can't do
HDR. This is also useful for non-HDR to get effectively
11 bpc precision from the fb to the display outputs for
more precise color reproduction.

thanks,
-mario

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