intel_set_cd...plane_update(9)

💅 intel_set_cdclk_pre_plane_update

okay so bestie, welcome to the Kernel API Manual 🎀 — yes we're reading kernel docs for fun now, this is who we are, and honestly? iconic behavior.

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✨ NAME ✨

intel_set_cdclk_pre_plane_update — the lil function that pushes the CDCLK state to the hardware 🫶

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🌸 SYNOPSIS 🌸

void intel_set_cdclk_pre_plane_update (struct intel_atomic_state *state
);

that's it. that's the whole signature. she's a void, she returns nothing, she simply does 💅

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🦋 ARGUMENTS 🦋

• state — the intel atomic state, aka the main character of this whole operation 👑

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💖 DESCRIPTION 💖

so basically: this function programs the hardware before the HW plane state gets updated, and it does that based on the new CDCLK state — if necessary. key phrase ngl, "if necessary" is doing a lot of heavy lifting there 🙈

so the whole vibe is: new CDCLK state comes in → hardware gets programmed first → then the plane state update happens. order matters, she's a pre-flight girlie ✨

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/i915/display/intel_cdclk.c — this is where she lives, go say hi 🏠
• CDCLK / RAWCLK(9)
• intel_cdclk_init_hw(9)
• intel_cdclk_uninit_hw(9)
• intel_cdclk_clock_changed(9)
• intel_cdclk_can_cd2x_update(9)
• intel_cdclk_changed(9)
• intel_set_cdclk_post_plane_update(9) — yes she has a sister, the post one, the way that name is literally the inverse 😭
• intel_update_max_cdclk(9)
• intel_update_cdclk(9)
• intel_read_rawclk(9)
• intel_init_cdclk_hooks(9)

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lowkey reminder bestie: the pre and the post versions are different functions, do not mix them up, that would be a vibe check failure fr fr 💀

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okay that's the page!! it came from ./drivers/gpu/drm/i915/display, dated October 2026, and it's filed under intel_set_cd...plane_update(9) — yes the title is truncated with dots, no I don't know why, and yes it's still slaying 💜✨ byeee 🦋