HDCP Content Type Interface

Jani Nikula jani.nikula at linux.intel.com
Tue Sep 10 07:45:49 UTC 2019

On Mon, 09 Sep 2019, "Lakha, Bhawanpreet" <Bhawanpreet.Lakha at amd.com> wrote:
> 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.

Has this been confirmed with some other HDCP source than the recently
merged HDCP 2.2 support? I.e. has it been confirmed the issue is really
in the sinks rather than in the source support?


> 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?
> Thanks,
> Bhawan
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Jani Nikula, Intel Open Source Graphics Center

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