drm_dp_tunnel_detect(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_tunnel_detect(9) 💅

okay so this is a page from the Kernel API Manual (yes, the kernel has lore too) and it's all about drm_dp_tunnel_detect — the little function that goes "hiii is there a DP tunnel on this link??" 🦋

✨ NAME ✨

drm_dp_tunnel_detect — bestie, it detects a DP tunnel on the link 💖

🌸 SYNOPSIS 🌸

struct drm_dp_tunnel * drm_dp_tunnel_detect (struct drm_dp_tunnel_mgr
*mgr , struct drm_dp_aux *aux );

like literally that's the whole signature, no notes 🫶

🎀 ARGUMENTS 🎀

  • mgr — the tunnel manager, aka the main character holding the tunnel group together 👑
  • aux — the DP AUX that the tunnel gets detected on, that's the spot we're checking 🔍

⭐ DESCRIPTION ⭐

so what it does is: it checks whether there's any DP tunnel on the link, and if there is one, it adds it to the tunnel group's tunnel list. that's it, that's the vibe ✨

Returns a pointer to a tunnel on success, or an ERR_PTR error on failure. no cap — success gives you the tunnel, failure gives you an error pointer, so check it before you go touching anything 😭

🌈 SEE ALSO 🌈

Kernel file ./drivers/gpu/drm/display/drm_dp_tunnel.c — the source, the origin story, the mothership 💜

and the whole friend group, no one gets left out:

and that's the page!! mwah 💋 this one lives in ./drivers/gpu/drm/display, dated October 2026, and it's filed under drm_dp_tunnel_detect(9) — go forth and detect those tunnels bestie, iykyk 🧚‍♀️💖

📦 where this page comes from