i915_read_mch_val(9)

💖 NAME 💖

i915_read_mch_val — return value for IPS use ✨

Okay bestie, welcome to the Kernel API Manual page for i915_read_mch_val — yes, that whole iconic little function name, no cap 💅

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🌸 SYNOPSIS 🌸

unsigned long i915_read_mch_val (void );

That's the whole vibe: it returns an unsigned long, and it takes void. Slay.

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🎀 ARGUMENTS 🎀

• void — no arguments, periodt. She takes nothing and gives you a value back 🫶

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🦋 DESCRIPTION 🦋

So here's the tea ☕ — i915_read_mch_val calculates and returns a value for the IPS driver to use when deciding whether we have thermal and power headroom to increase the CPU or GPU power budget. Literally that's her job 💖

No extra mystery, no secret side quest: calculate the value, return the value, let the IPS driver do its thing with it. Iconic behavior, honestly ✨

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/i915/gt/intel_rps.c 👀
• gen6_rps_get_freq_caps(9)
• intel_rps_get_max_raw_freq(9)
• intel_rps_get_min_raw_freq(9)
• i915_gpu_raise(9)
• i915_gpu_lower(9)
• i915_gpu_busy(9)
• i915_gpu_turbo_disable(9)

Like, go read the friends too, iykyk 🧚‍♀️💜

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This lil page comes from ./drivers/gpu/drm/i915/gt, and it's dated October 2026 — cute sign-off, mwah 💋🎀