drm_connecto...ion_property(9)

💅 drm_connector_attach_content_protection_property — the Kernel API Manual, section 9, bestie

okay so picture this: you're deep in the DRM subsystem (the Kernel API Manual, section 9, no big deal) and you need content protection on a connector. this page is literally your girl. it's the drm_connector_attach_content_protection_property page and we're gonna read it together, hand in hand, because honestly? iconic. 🎀

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✨ NAME ✨

drm_connector_attach_content_protection_property — attach content protection property 💖

like, that's the whole job. attaching the CP property. slay.

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🌸 SYNOPSIS 🌸

int drm_connector_attach_content_protection_property (struct
       drm_connector *connector , bool hdcp_content_type );

ngl the line wrapping on this is a little chaotic but we respect her 🫶

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🦋 ARGUMENTS 🦋

• connector — the connector you're attaching the CP property on. yes, that connector. the one you brought with you.
• hdcp_content_type — a bool telling us whether the HDCP Content Type property is needed for this connector. like, is it required or not, bestie. be honest.

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💜 DESCRIPTION 💜

so this whole function is used to add support for content protection on select connectors — not all of them, just the chosen ones, main character energy only. ✨

and okay, "Content Protection" is intentionally vague, and that's on purpose: it's vague so different underlying technologies can all live under the same umbrella. but let's be real — it's mostly implemented by HDCP. highkey always HDCP.

When hdcp_content_type is true, an enum property called HDCP Content Type is created (if it is not already, so don't worry if she's already there) and attached to the connector. 💅

This property is used for sending the protected content's stream type from userspace to kernel on selected connectors. the protected content provider will decide their type of their content and declare the same to kernel. like, they know their own vibe, they announce it, we respect it. periodt.

Content type will be used during the HDCP 2.2 authentication. Content type will be set to drm_connector_state.hdcp_content_type. put that literally in the state, that's where she lives.

The content protection will be set to drm_connector_state.content_protection — same deal, different field. 🍓

When kernel triggered content protection state change like DESIRED->ENABLED and ENABLED->DESIRED, will use drm_hdcp_update_content_protection to update the content protection state of a connector. so it's not you doing it manually, the kernel's handling her transitions and it's giving responsible. 🔥

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👑 RETURN 👑

Zero on success, negative errno on failure. classic. zero = happy, negative errno = 😭.

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/display/drm_hdcp_helper.c — go read her, she's where the magic happens
• drm_hdcp_check_ksvs_revoked(9)
• drm_hdcp_update_content_protection(9)

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and that's the page, bestie!! 🧚 no cap, you're basically an HDCP expert now. shoutout to the source at ./drivers/gpu/drm/display, dated October 2026, and to the page herself, drm_connecto...ion_property(9) — the way she truncated her own name in the footer and we still love her. 💀💖 see u in the next manpage, mwah! 🌸💅