omap_irq_enable_vblank(9)

💅 omap_irq_enable_vblank(9)

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little kernel function page from the omapdrm crew, and honestly? she's short, she's sweet, she's giving "tiny function, big responsibility." let's get into it 🫶

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🌸 NAME 🌸

omap_irq_enable_vblank — literally just: turn on vblank interrupt events 💫

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✨ SYNOPSIS ✨

int omap_irq_enable_vblank (struct drm_crtc *crtc );

like, that's the whole signature. one arg. no cap. 🎀

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🧚 ARGUMENTS 🧚

• crtc — the DRM CRTC 🖥️ (yes that's the whole description, she's mysterious like that, iykyk)

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💖 DESCRIPTION 💖

So what she does: enable vblank interrupts for crtc. that's the main character move 👑

BUT — and this is the important little plot twist — if the device doesn't have a hardware vblank counter, this routine should be a no-op. why? because the interrupts have to stay on to keep the count accurate. basically you can't be out here switching things off when the count depends on them, that's not slaying, that's breaking things 😭

lowkey a vibe check for your driver: no hardware vblank counter = do nothing here. fr fr.

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🔁 RETURNS 🔁

• Zero on success 🌈
• the appropriate errno if the given crtc's vblank interrupt cannot be enabled 🚫

so like, zero = we ate 💅, errno = something went sideways and she's telling you exactly how.

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👀 SEE ALSO 👀

• Kernel file ./drivers/gpu/drm/omapdrm/omap_irq.c — go read the source, bestie, it's all in there 📖
• omap_irq_disable_vblank(9) — the other half of the duo, the turning-it-back-off one 🦋

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and that's the page!! mwah 💋 this little icon came to you from ./drivers/gpu/drm/omapdrm, dated October 2026 — periodt, go enable some vblank interrupts responsibly 🎀✨💜