intel_hpd_block(9)

📦 version 7.3.1, in nixpkgs unstable

💅 intel_hpd_block(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual, and it's all about intel_hpd_block — a function that literally just says "bestie, hold my HPD IRQs" for one specific pin. no cap, it's short but it's important. let's get into it ✨

🌸 NAME 🌸

intel_hpd_block — blocks the handling of HPD IRQs on an HPD pin. that's the whole vibe. 🦋

⭐ SYNOPSIS ⭐

void intel_hpd_block (struct intel_encoder *encoder );

yes it's just the one function, she's concise, she's iconic 👑

💖 ARGUMENTS 💖

  • encoder — the encoder whose HPD handling you're about to block. that's it. that's the whole argument. 🫶

✨ DESCRIPTION ✨

so basically: this function blocks the handling of HPD IRQs on the HPD pin of encoder. simple as that. 💅

now here's the part where you need to pay attention, because on return there are three things you can count on, and they are NOT the same thing:

  • it's guaranteed that the blocked encoder's HPD pulse handler (the one that goes via intel_digital_port::hpd_pulse) is not running. like, fully done, closed, gone. ✅
  • but the hotplug event handling (via intel_encoder::hotplug) of an HPD IRQ that was already pending at the time this function got called may still be running. so like... don't assume it's all wrapped up, okay? 😭
  • detection on the encoder's connector (via drm_connector_helper_funcs::detect_ctx and drm_connector_funcs::detect) is still allowed. for instance as part of userspace connector probing, or the DRM core's connector polling. so detecting stays on the menu 🍓
⚠️ okay this part is important: this call must be followed by calling intel_hpd_unblock, or intel_hpd_clear_and_unblock. you cannot just leave it blocked and walk away. that's not the move. 🙈

and one more little plot twist — handling of HPD IRQs for another encoder that's using the same HPD pin as encoder will also be blocked. so like, it's a package deal, iykyk 💀

💜 SEE ALSO 💜

okay and finally, the little sign-off at the bottom — this whole vibe lives in ./drivers/gpu/drm/i915/display, and it's dated October 2026. so you know, freshly pressed, main character energy, periodt 💅🌟🦋

📦 where this page comes from