drm_helper_crtc_in_use(9)

💖 NAME 💖

okay so this is drm_helper_crtc_in_use(9) from the Kernel API Manual, and it has one very specific job: check if a given CRTC is in a mode_config. That’s the whole vibe. No cap. 💅

✨ SYNOPSIS ✨

bool drm_helper_crtc_in_use (struct drm_crtc *crtc );

🎀 ARGUMENTS 🎀

• crtc — the CRTC to check. That’s it. That’s the bestie we’re checking on. 🫶

🦋 DESCRIPTION 🦋

It checks whether crtc is with the current mode setting output configuration in use by any connector. Yes, bestie, that’s the actual sentence — we’re keeping it exactly like that. 💖

Important vibe check: this does not mean that it is actually enabled, since the DPMS state is tracked separately. “In use” ≠ “enabled,” okay? 💀

💅 RETURN 💅

• true if crtc is used.
• false otherwise.

It’s giving simple boolean, periodt. ✨

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/drm_crtc_helper.c overview(9)
• drm_helper_encoder_in_use(9)
• drm_helper_disable_unused_functions(9)
• drm_crtc_helper_set_mode(9)
• drm_crtc_helper_atomic_check(9)
• drm_crtc_helper_set_config(9)
• drm_helper_connector_dpms(9)
• drm_helper_resume_force_mode(9)
• drm_helper_force_disable_all(9)

Catch you later, bestie 💖 — this page is from ./drivers/gpu/drm, dated October 2026, and it’s serving drm_helper_crtc_in_use(9) realness. Periodt. 🎀