drm_vblank_init(9)

💫 drm_vblank_init(9) 💫

okay bestie, so this is a page from the Kernel API Manual — yeah, the kernel, we're doing kernel stuff today, put your hair up 🎀 — and it's all about drm_vblank_init, which is, like, the glow-up moment where a DRM device gets its vblank support. it's giving main character initialization arc. ✨

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✨ SYNOPSIS ✨

like, the whole signature, verbatim, no cap:

int drm_vblank_init (struct drm_device *dev , unsigned int num_crtcs );

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🌸 ARGUMENTS 🌸

• dev — the DRM device in question. your little guy. your blorbo. 🫶
• num_crtcs — how many CRTCs dev supports. that's the number of display pipelines we're talking about here, periodt.

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🦋 DESCRIPTION 🦋

so what does this function actually do? it initializes vblank support for num_crtcs display pipelines. that's it, that's the vibe. it sets them up so they can do their vblank thing. 💅

and here's the iconic part: cleanup? not your problem. it's handled automatically through a cleanup function added with drmm_add_action_or_reset. the kernel literally does the tidying for you — obsessed. no manual teardown arc, no messy breakup, it just cleans itself up. 😭👑

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⭐ RETURN ⭐

• Zero on success 🎉 (slay)
• a negative error code on failure 💀 (not slay, but at least it tells you)

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🔥 SEE ALSO 🔥

buckle up bestie, this list is long, but every single one of these is important, so we're listing them all, fr fr:

• Kernel file ./drivers/gpu/drm/drm_vblank.c
• vblank handling(9)
• drm_crtc_accurate_vblank_count(9)
• drm_dev_has_vblank(9)
• drm_crtc_vblank_waitqueue(9)
• drm_calc_timestamping_constants(9)
• drm_crtc_vblank_helper_get_vblank_timestamp_internal(9)
• drm_crtc_vblank_helper_get_vblank_timestamp(9)
• drm_crtc_get_last_vbltimestamp(9)
• drm_crtc_vblank_count(9)
• drm_vblank_count_and_time(9)
• drm_crtc_vblank_count_and_time(9)
• drm_crtc_next_vblank_start(9)
• drm_crtc_arm_vblank_event(9)
• drm_crtc_send_vblank_event(9)
• drm_crtc_vblank_get(9)
• drm_crtc_vblank_put(9)
• drm_crtc_wait_one_vblank(9)
• drm_crtc_vblank_off(9)
• drm_crtc_vblank_reset(9)
• drm_crtc_set_max_vblank_count(9)
• drm_crtc_vblank_on_config(9)
• drm_crtc_vblank_on(9)
• drm_crtc_vblank_restore(9)
• drm_handle_vblank(9)
• drm_crtc_handle_vblank(9)
• drm_crtc_vblank_start_timer(9)
• drm_crtc_vblank_cancel_timer(9)
• drm_crtc_vblank_get_vblank_timeout(9)

iykyk 🌈

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k bye, that's the whole page, mwah 💖 this lil number lives in ./drivers/gpu/drm, and it's dated October 2026 — yes, future girlie behavior, we love to see it. take care of your vblanks and they'll take care of you 🧚‍♀️⭐💜