drm_crtc_hel...atomic_check(9)

💅 drm_crtc_hel...atomic_check(9) — Kernel API Manual

okay bestie, welcome to the group chat 💖 so this whole thing is a page from the Kernel API Manual, and today's main character is drm_crtc_hel...atomic_check(9). yes that's the truncated name, that's just how it's written in the header, no cap — the full function is the one in NAME below. let's get into it ✨

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🌸 NAME 🌸

drm_crtc_helper_atomic_check — a helper that checks the CRTC atomic-state 🎀

like, it's literally the vibe-checker for your CRTC's atomic state. obsessed.

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🦋 SYNOPSIS 🦋

int drm_crtc_helper_atomic_check (struct drm_crtc *crtc , struct
       drm_atomic_commit *state );

here's the signature, character for character, don't come for me 💅

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✨ ARGUMENTS ✨

• crtc — the CRTC you're checking. that's the thing under inspection, bestie 👑
• state — the atomic state object. the state, the vibes, the whole situation 🫶

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🌈 DESCRIPTION 🌈

okay so this function provides a default CRTC-state check handler for CRTCs that only have one primary plane attached to them. literally just the one. nothing else.

and this situation — a single primary plane, no extra friends — is often the case for the CRTC of simple framebuffers. so if that's your setup, this helper is your girl 🧚

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🔥 RETURN 🔥

Zero on success ✨ — or an errno code otherwise 💀 (so like, check it, don't just assume it slayed).

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👑 SEE ALSO 👑

the required reading, iykyk:

• Kernel file ./drivers/gpu/drm/drm_crtc_helper.c — overview(9)
• drm_helper_encoder_in_use(9)
• drm_helper_crtc_in_use(9)
• drm_helper_disable_unused_functions(9)
• drm_crtc_helper_set_mode(9)
• drm_crtc_helper_set_config(9)
• drm_helper_connector_dpms(9)
• drm_helper_resume_force_mode(9)
• drm_helper_force_disable_all(9)

all of these, in exactly this order, at exactly these names — go read them, they ate 🔥

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side note from your girl: keep the names and paths EXACTLY as written. renaming things in kernel land is not the move, fr fr 🙈

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mwah, that's the whole page 🎀 this one lives under ./drivers/gpu/drm and the footer clocks it at October 2026, so mark your calendar bestie 🦋 — same manual, same date, no edits, periodt. 💜