HDCP Content Type Interface

Lakha, Bhawanpreet Bhawanpreet.Lakha at amd.com
Mon Sep 9 15:54:50 UTC 2019

Hi all,

This is regarding the recent hdcp content type patch that was merged into drm-misc. (https://patchwork.freedesktop.org/patch/320958/?series=57233&rev=11)

There are displays on the market that advertise HDCP 2.2 support and will pass authentication and encryption but will then show a corrupted/blue/black screen (the driver cannot detect this). These displays work with HDCP 1.4 without any issues. Due to the large number of HDCP-supporting devices on the market we might not be able to catch them with a blacklist.

From the user modes perspective, HDCP1.4 and HDCP2.2 Type0 are the same thing. Meaning that this interface doesn't allow us to force the hdcp version. Due to the problems mentioned above we might want to expose the ability for a user to force an HDCP downgrade to a certain level (e.g. 1.4) in case they experience problems.

What are your thoughts? and what would be a good way to deal with it?


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