STRUCT KOMEDA_PIPELINE(9)

💅 struct komeda_pipeline(9) — the glow-up ✨

okay so this is a page from the Kernel API Manual, section 9 (kernel internals, bestie, iykyk 🧚), and we're talking about struct komeda_pipeline — no cap, she's the whole main character of the display pipeline world 💖

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🌸 NAME 🌸

struct komeda_pipeline — literally just the struct name, the manpage doesn't even give it a tagline. it's giving mysterious. 🎀

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✨ SYNOPSIS ✨

here's the whole struct, copy-pasted with love, character for character, don't @ me:

struct komeda_pipeline {
    struct drm_private_obj obj;
    struct komeda_dev *mdev;
    struct clk *pxlclk;
    int id;
    u32 avail_comps;
    u32 standalone_disabled_comps;
    int n_layers;
    struct komeda_layer *layers[KOMEDA_PIPELINE_MAX_LAYERS];
    int n_scalers;
    struct komeda_scaler *scalers[KOMEDA_PIPELINE_MAX_SCALERS];
    struct komeda_compiz *compiz;
    struct komeda_splitter *splitter;
    struct komeda_merger *merger;
    struct komeda_layer  *wb_layer;
    struct komeda_improc *improc;
    struct komeda_timing_ctrlr *ctrlr;
    const struct komeda_pipeline_funcs *funcs;
    struct device_node *of_node;
    struct device_node *of_output_port;
    struct device_node *of_output_links[2];
    bool dual_link;
 };

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👑 Members 👑

bestie, let's go through every single one, we are NOT skipping anybody 💜

• obj — links the pipeline as the private obj of drm_atomic_commit. she's got ties to the atomic commit world fr fr 🦋
• mdev — the parent komeda_dev. the mothership, the OG 🌈
• pxlclk — pixel clock ⏰✨
• id — pipeline id. she has a name and it's a number 💅
• avail_comps — the available components mask of the pipeline 🎀
• standalone_disabled_comps — okay so this one's a whole paragraph: when you disable the pipeline, some components cannot be disabled together with the others — they need a separated and standalone disable. the standalone_disabled_comps are exactly those components that need to be disabled standalone. and this concept also introduces the concept of two phase 👀:
  • phase 1: for disabling the common components.
  • phase 2: for disabling the standalong_disabled_comps (yes, that spelling is in the original, keeping it exactly as-is, no cap 🙈).
• n_layers — the number of layer on layers 🍓
• layers — the pipeline layers ⭐
• n_scalers — the number of scaler on scalers 🎀
• scalers — the pipeline scalers ✨
• compiz — compositor 💖
• splitter — for split the compiz output to two half data flows — she divides, she conquers 🌸
• merger — merger (the splitter's other half, the reuniting arc 🫶)
• wb_layer — writeback layer 📝
• improc — post image processor 🖼️
• ctrlr — timing controller ⏳
• funcs — chip private pipeline functions 🔧
• of_node — pipeline dt node 🌳
• of_output_port — pipeline output port 🔌
• of_output_links — output connector device nodes 🔗
• dual_link — true if of_output_links[0] and [1] are both valid. like, both of them. valid. periodt 💀

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🦋 Description 🦋

she represents a complete display pipeline and holds all the functional components. that's it, that's the vibe — one struct to hold the entire crew 👑

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🔥 SEE ALSO 🔥

go read these next, bestie, they're all connected:

• Kernel file ./drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
• struct komeda_component(9)
• struct komeda_component_output(9)
• struct komeda_component_state(9)
• struct komeda_pipeline_state(9)

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ngl this page is short but she ate 💅 now go read the header file, it's giving lore.

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okay that's the whole page, and for the cute sign-off: this came from ./drivers/gpu/drm/arm/display/... with the version footer dated October 2026, and the page itself is struct komeda_pipeline(9) — mwah, bye bestie 😭💖🎀