STRUCT KOMEDA_COMPONENT_STATE(9)

💅 struct komeda_component_state(9)

okay bestie, welcome to the Kernel API Manual ✨ — today's main character is struct komeda_component_state(9), and honestly? she's kind of a big deal underneath all that arm/display glam. let's get into it 🎀

---

✨ NAME ✨

struct komeda_component_state — like, the struct itself. that's the whole name. no notes. 🫶

---

🌸 SYNOPSIS 🌸

here's the shape of her, literally, character for character:

struct komeda_component_state {
    struct drm_private_state obj;
    struct komeda_component *component;
    union {
      struct drm_crtc *crtc;
      struct drm_plane *plane;
      struct drm_connector *wb_conn;
      void *binding_user;
    };
    u16 active_inputs;
    u16 changed_active_inputs;
    u16 affected_inputs;
    struct komeda_component_output inputs[KOMEDA_COMPONENT_N_INPUTS];
 };

look at that anonymous union just vibing in the middle, no name, no label, just ✨mystery✨.

---

🦋 Members 🦋

• obj — this is what tracks the component_state via drm_atomic_commit. she's the chaperone. 👑
• component — backpointer to the component. yes, she points home. iconic.
• {unnamed_union} — anonymous. that's it, that's the description. no name given, and we respect her privacy 🙈. inside it you got:
• crtc — backpointer for the user crtc
• plane — backpointer for the user plane
• wb_conn — backpointer for the user wb_connector
• binding_user — the currently bound user. and like, who is that? could be crtc, could be plane, could be wb_conn — it's "valid decided by component and inputs", iykyk. here's the breakdown fr:
  • Layer: its user is always plane. periodt.
  • compiz/improc/timing_ctrlr: the user is crtc.
  • wb_layer: wb_conn;
  • scaler: plane when the input is layer, and wb_conn if the input is compiz. she contains multitudes 💅
• active_inputs — bitmask of the inputs index. the math is mathing, watch:
  • active_inputs = changed_active_inputs | unchanged_active_inputs
  • affected_inputs = old->active_inputs | new->active_inputs;
  • disabling_inputs = affected_inputs ^ active_inputs;
  • changed_inputs = disabling_inputs | changed_active_inputs;

NOTE: changed_inputs doesn't include all active_input but only changed_active_inputs, and this bitmask can be used in chip level for dirty update. so don't come for her about the naming, she's doing her best 😭

• changed_active_inputs — bitmask of the changed_active_inputs. short and sweet, we stan.
• affected_inputs — bitmask for affected inputs.
• inputs — the specific inputs[i] is only valid when BIT(i) has been set in active_inputs. if not? the inputs[i] is undefined. read that again ngl, undefined means undefined, no cap 💀

---

🌈 Description 🌈

okay so the whole vibe: component_state is the data flow configuration of the component. she's the superclass of all the specific component_states — think komeda_layer_state, komeda_scaler_state. mother is mothering, the children inherit 👑

---

⭐ SEE ALSO ⭐

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

go read them, bestie, they're all linked in the group chat 🫶

---

and that's the page, babes 💖 this came out of ./drivers/gpu/drm/arm/display/... — version dated October 2026 — and she's still serving struct kome...ponent_state(9) realness. slay, no cap, periodt 🌸✨🎀