dm_test_hdcp...els_validate(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_test_hdcp_update_display_disable_resets_status_and_cancels_validate — the disabled-path glow-up test

okay so real quick, this page lives in the Kernel API Manual and it's about one extremely specific little KUnit test. the function name is genuinely a whole paragraph (💀) but bestie, it's giving "long name, simple job" and honestly? we love that for us.

✨ NAME ✨

dm_test_hdcp_update_display_disable_resets_status_and_cancels_validate — disable path state update. that's it, that's the vibe: when you turn encryption off, this test checks that the state actually gets updated. 🎀

🌸 SYNOPSIS 🌸

hehe the synopsis is literally a whole cliffhanger because the line breaks mid-name, but here's the exact signature babe, no cap:

void
dm_test_hdcp_update_display_disable_resets_status_and_cancels_validate
(struct kunit *test );

returns void (so, nothing, it just does the thing) and takes one arg. periodt. ✨

🦋 ARGUMENTS 🦋

  • test — the KUnit test context. that's the little bubble this test runs inside, and the test uses it to check itself. 🫶

👑 DESCRIPTION 👑

so what is hdcp_update_display supposed to do when encryption is disabled? two things, and this test is obsessed with both of them:

  • it should set encryption_status to HDCP_OFF 😌
  • it should cancel property_validate_dwork 🔥

basically: when you disable encryption, the status has to flip off and that pending property-validate work has to get cancelled. this test is the vibe check for that exact behaviour. literal main character energy for the disable path. 💜

🌈 SEE ALSO 🌈

first up, the Kernel file — the source of truth, the origin story:

./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_hdcp_test.c

and now, the entire friend group — every single one of these, in order, because we do not skip anyone in this group chat:

like, that's the whole extended universe. iykyk 💅

ngl bestie, the source path on this one is literally truncated at ./drivers/gpu/drm/amd/display/... in the original — so that's all we got. no inventing extra path segments, we don't do that here. 🙈

🎀 the cute sign-off 🎀

and that's the page!! it comes to you from October 2026, straight out of ./drivers/gpu/drm/amd/display/... (yes, still truncated, blame the original, not me 😭). stay slay, cancel your dwork, and set that status to HDCP_OFF when you're done. mwah 💖✨🍓

📦 where this page comes from