_dpu_rm_che...nnected_blks(9)

📦 version 7.3.1, in nixpkgs unstable

✨ _dpu_rm_che...nnected_blks(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 — yes, the whole function name is literally _dpu_rm_check_lm_and_get_connected_blks and no, we are not abbreviating it, the header up there is just being dramatic and cutting it off. pull up a chair, this one's a vibe check on whether your layer mixer + its hardwired besties (looking at you, pingpong 👀) are actually available before you go reserving them.

🌸 NAME 🌸

_dpu_rm_check_lm_and_get_connected_blks — checks if the proposed layer mixer meets the proposed use case requirements, including hardwired dependent blocks like pingpong 🫶

🎀 SYNOPSIS 🎀

bool _dpu_rm_check_lm_and_get_connected_blks (struct dpu_rm *rm , struct
dpu_global_state *global_state , uint32_t crtc_id , int lm_idx , int
*pp_idx , int *dspp_idx , struct msm_display_topology *topology );

like, yes that's the whole signature, and yes it returns a bool — she's a yes-or-no girlie 💖

🦋 ARGUMENTS 🦋

  • rm — the dpu resource manager handle 🗂️ your whole resource situation lives in here
  • global_state — resources shared across multiple kms objects 🌈 (shared custody, basically)
  • crtc_id — the crtc id that's requesting the allocation 🙋‍♀️ she's asking, politely
  • lm_idx — the index of the proposed layer mixer in rm->mixer_blks[]. the function checks whether this lm — plus all the other hardwired blocks connected to the lm (pp) — is available and appropriate ✨
  • pp_idx — output parameter 🫶 the index of the pingpong block attached to the layer mixer, living in rm->pingpong_blks[].
  • dspp_idx — output parameter 💜 the index of the dspp block attached to the layer mixer, in rm->dspp_blks[].
  • topology — the selected topology for the display 🖼️ the whole look she's going for
real talk: pp_idx and dspp_idx are output parameters — they're where the function hands you back the indices it found. don't come for her if they're not what you expected going in 🙈

⭐ RETURN ⭐

true if the lm matches all the requirements ✅💅 false otherwise ❌😭

it's giving simple, it's giving honest. no cap.

🔥 SEE ALSO 🔥

kernel file ./drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c — and her whole friend group:

and that's the whole page bestie 🧚✨ sign-off time: this one lives in ./drivers/gpu/drm/msm/disp/dpu1, dated October 2026, and yeah, the running header still says _dpu_rm_che...nnected_blks(9) because even the manpage generator gave up halfway through that name 💀💖 ily, go check your layer mixers 🎀

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