drm_crtc_vblank_reset(9)

✨ drm_crtc_vblank_reset 💅

okay so bestie, welcome to the drm_crtc_vblank_reset page from the Kernel API Manual (that's the manpage name right there, iykyk) 🎀 — this one's short and sweet and honestly kind of a bop.

🌸 SYNOPSIS 🌸

void drm_crtc_vblank_reset (struct drm_crtc *crtc );

🦋 ARGUMENTS 🦋

• crtc — the CRTC in question, aka the one we're doing this whole glow-up on ✨

💖 DESCRIPTION 💖

so here's the vibe: drivers can use this function to reset the vblank state to off at load time. that's the whole assignment, and it ate 🔥

key thing though — drivers should use this together with drm_crtc_vblank_off and drm_crtc_vblank_on. they're a little trio, they go together 🫶

now, the difference compared to drm_crtc_vblank_off? lowkey important: this function doesn't save the vblank counter, and because of that it doesn't need to call any driver hooks. no hooks, no drama, no extra calls. periodt 💅

and where does that actually come in handy? it's useful for recovering driver state, e.g. on driver load, or on resume 🌈. like when your driver wakes up from its nap and needs to remember who it is 😭

ngl this is one of those functions that's tiny but you will be glad it exists when resume gets weird 💀

👑 SEE ALSO 👑

• 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_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)

and that's the whole page, bestie, you ate that reading assignment 🍓✨ this one ships out of ./drivers/gpu/drm, dated October 2026 — mwah, go reset some vblank state, mwah 💜🧚