Re: [PATCH v3 3/9] drm: Add Content Protection property

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On Wednesday 06 December 2017 09:56 PM, Sean Paul wrote:
I'd rather keep the property as-is and expose an HDCP version property
alongside it (or perhaps something more elaborate that includes bksv and the
downstream bksvs). The reason I prefer that is it will also cover the 1.2 vs 1.4
difference that is a more immediate need.
HDCP specification wants to differentiate 2.2 vs <2.2 as 2.2 is not a backward compatible.
Why do we need to differentiate 1.2 and 1.4? Any use case?

Someone on the Chrome side asked me to surface the version, apparently
they care about 1.2 vs 1.4.

Sean, if you can get the reason for differentiating v1.2 and v1.4 at chrome, it will be educative info. - Thanks

-Ram
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