drm_dp_mst_p...am_of_parent(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

drm_dp_mst_port_downstream_of_parent — check if a port is downstream of a parent port 💅

okay so real quick, this is a page from the Kernel API Manual, and it's about one tiny little function that answers one tiny little question: is this port, like, under that port? family tree energy fr fr 🌳

🌸 SYNOPSIS 🌸

bool drm_dp_mst_port_downstream_of_parent (struct
       drm_dp_mst_topology_mgr *mgr , struct drm_dp_mst_port *port , struct
       drm_dp_mst_port *parent );

🎀 ARGUMENTS 🎀

  • mgr — the MST topology manager, aka the main character of this whole topology situation 👑
  • port — the port being looked up, the one we're asking about 🕵️‍♀️
  • parent — the parent port, the one we're asking about about 💖

🦋 DESCRIPTION 🦋

So the function returns true if port is downstream of parent. That's it, that's the whole vibe ✨

And if parent is NULL — which denotes the root port, iykyk — then the function returns true if port is in mgr's topology. Lowkey elegant, no cap 🫶

🔥 SEE ALSO 🔥

Kernel file ./drivers/gpu/drm/display/drm_dp_mst_topology.c — and honestly bestie, here's the whole friend group, every single one of them:

bestie that's literally it, that's the whole page 😭 short and iconic, we love a concise queen 💜

and that's a wrap!! this one lives in ./drivers/gpu/drm/display, dated October 2026 — mwah, go drink some water and go read your topology docs 🧚‍♀️🌸💖

📦 where this page comes from