drm_crtc_vblank_start_timer(9)

✨ drm_crtc_vblank_start_timer(9) ✨

okay bestie, welcome to the Kernel API Manual 💖 this one's a little one but it's lowkey iconic — it's all about getting that vblank timer up and running on your CRTC. let's go 🎀

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🌸 NAME 🌸

drm_crtc_vblank_start_timer — starts the vblank timer on the given CRTC ✨

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🦋 SYNOPSIS 🦋

int drm_crtc_vblank_start_timer (struct drm_crtc *crtc );

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💅 ARGUMENTS 💅

• crtc — the CRTC 🫶 that's it, that's the whole argument, she's simple and she knows it

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👑 DESCRIPTION 👑

so here's the tea ☕ — drivers should call this function from their CRTC's enable_vblank function to start a vblank timer. that's the whole assignment, no cap. the timer will fire after the duration of a full frame 🌈 (yes, one whole frame, she's punctual like that).

and if you ever need to shut it down? drm_crtc_vblank_cancel_timer disables a running timer 💀 so like, start it here, cancel it there, balanced as all things should be ✨

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⭐ RETURN ⭐

0 on success 🎉 or a negative errno code otherwise 😭 (yeah she can fail, check your return values bestie, fr fr)

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🔥 SEE ALSO 🔥

okay this list is long long, so buckle up 🧚 — every single one of these is your new best friend:

• Kernel file ./drivers/gpu/drm/drm_vblank.c — vblank handling(9)
• drm_crtc_accurate_vblank_count(9)
• drm_vblank_init(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_cancel_timer(9)
• drm_crtc_vblank_get_vblank_timeout(9)

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and that's the whole page, mwah 💋 this lil gem lives in ./drivers/gpu/drm, dated October 2026, and she's filed under drm_crtc_vblank_start_timer(9) — go forth and start those timers, bestie, iykyk 🫶💜