[igt-dev] [PATCH RFC i-g-t] kms_content_protection: use delay for few panels which don't respond for AKE cert read.

[Chris Wilson]

Quoting Anshuman Gupta (2020-01-03 10:30:22)
> While running HDCP igt tests with some panels like Accer CB281HK,
> panel state machine enters to bad state such that they won't respond
> to AKE cert read request properly until unless they are being
> power cycle off/on.
> These panels doesn't seems to handle back to back HDCP authentication
> request, using a delay of 1 seconds before enabling HDCP reduced the
> reproduction rate. Using 100ms delay in i915 driver before AKE cert read
> also fixes this issue, it is safer to use delay in IGT for HDCP tests
> for these panels.

HW misbehaves, so workaround in userspace? That does not bode well.
-Chris