CrOS: Surface HDCP version from kernel |
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Issue descriptionWe need to be able to differentiate between 1.4 and 1.2 (and possibly 2.2 once it becomes relevant).
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Jan 24 2018
Going to take a crack at this today
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Jan 24 2018
Is this relevant to ARC?
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Jan 24 2018
@c3: Yes, apparently android needs the HDCP version before it can present protected content. I've just cc'd you on the email thread.
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Jan 24 2018
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Jan 24 2018
Bringing some data over from the email thread: HDMI, HDCP, and EDID versions map 1:1 up to 1.4. Since this is true, we already have the EDID version in chrome, which means we have the HDCP version in chrome. The EDID version is located in the 18th and 19th bytes of the EDID (major and minor, respectively). According to tinskip@, DisplayPort only implements 1.3, so that case is also easy. In light of this, we don't need to add anything further to kernel at this time. Once HDCP 2.2 comes along, we'll need to solve this problem, but deferring UAPI changes is almost always beneficial. Marking as fixed for now. |
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Comment 1 by jkardatzke@chromium.org
, Nov 17 2017