i915_hotplu...rrupt_update(9)

💖 i915_hotplug_interrupt_update — like, the Kernel API Manual, bestie 💖

okay so welcome to i915_hotplu...rrupt_update(9), from the Kernel API Manual — yes the title is literally truncated with dots, that's not me being lazy, that's just how it's printed, iykyk 💅

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✨ NAME ✨

i915_hotplug_interrupt_update — update hotplug interrupt enable 🦋

like… it updates the hotplug interrupt enable. that's the whole vibe. no cap.

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🌸 SYNOPSIS 🌸

void i915_hotplug_interrupt_update (struct intel_display *display , u32
mask , u32 bits );

literally exactly that, character for character, don't come for me 🫶

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🎀 ARGUMENTS 🎀

• display — the display device. the main character of this whole operation, honestly 👑
• mask — bits to update. it's giving "which ones are we touching" 🎯
• bits — bits to enable. the ones we're actually turning on ✨

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⚠️ NOTE ⚠️

okay bestie, this is the part where you gotta listen, fr fr 🙈

the HPD enable bits get modified both inside AND outside of an interrupt context. and like… to avoid those read-modify-write cycles interfering with each other (messy, we hate that 💀), these bits are protected by a spinlock 🔒

since this function is usually not called from a context where the lock is held already, this function acquires the lock itself 💪

and — good news — a non-locking version is also available, so if you're already holding it, you're covered 🫶

ngl, do NOT just assume the lock is free. that's the whole point of the note. respect the spinlock, it's iconic and it will humble you 😭

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🔥 SEE ALSO 🔥

Kernel file ./drivers/gpu/drm/i915/display/intel_hotplug_irq.c — go read it, it's right there, lowkey obsessed with how hard this path goes 🌈

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and that's the whole page, bestie!! ✨💖🎀🦋🌸💅🫶

cute little sign-off time: this one lives under ./drivers/gpu/drm/i915/display, it's dated October 2026, and the manual is i915_hotplu...rrupt_update(9). periodt. 👑💜