intel_update_cdclk(9)

💅 intel_update_cdclk(9)

okay so this is intel_update_cdclk, straight out of the Kernel API Manual (section 9, kernel gang 🫶), and it's literally the little function that figures out what CDCLK is doing right now.

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✨ NAME ✨

intel_update_cdclk — bestie, it determines the current CDCLK frequency 💖

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🦋 SYNOPSIS 🦋

void intel_update_cdclk (struct intel_display *display );

that's it. that's the whole vibe. no return value, just vibes and a void ✨

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🎀 ARGUMENTS 🎀

• display — the display instance 🖥️ like, the actual display thing you're passing in. that's the whole argument. iconic of it honestly.

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🌸 DESCRIPTION 🌸

Determine the current CDCLK frequency. 💫

that's the whole description, no cap — it goes and finds out what the CDCLK frequency is currently set to. lowkey one of those "does what it says on the tin" situations and we respect it for that 👑

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👑 SEE ALSO 👑

if you're obsessed (and you should be), go check out the kernel file ./drivers/gpu/drm/i915/display/intel_cdclk.c — that's where the CDCLK / RAWCLK(9) magic lives, and it's giving main character energy ngl 🧚

the whole friend group also includes:

• intel_cdclk_init_hw(9) — ✨ the setup girlie ✨
• intel_cdclk_uninit_hw(9) — 💀 the cleanup era 💀
• intel_cdclk_clock_changed(9) — 🦋 did the clock change? find out 🦋
• intel_cdclk_can_cd2x_update(9) — 🌈 can it do the CD2X update? the people wanna know 🌈
• intel_cdclk_changed(9) — 🔥 changed or not, no cap 🔥
• intel_set_cdclk_pre_plane_update(9) — 🎀 the pre-plane-update step 🎀
• intel_set_cdclk_post_plane_update(9) — 🎀 the post-plane-update step 🎀
• intel_update_max_cdclk(9) — ⭐ the max version, the overachiever ⭐
• intel_read_rawclk(9) — 💜 reading the RAWCLK, iykyk 💜
• intel_init_cdclk_hooks(9) — 🌸 hooks init, we love a setup arc 🌸

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fr fr go read the source before you touch anything — this is kernel display code, and it's giving "do not poke the bear" energy 🙈

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and that's a wrap, bestie 🫶 this page came to you from the kernel docs in ./drivers/gpu/drm/i915/display, dated October 2026, as part of the Kernel API Manual — intel_update_cdclk(9) out 💅✨ thank u for coming to my ted talk 🍓