drm_bridge_enter(9)

✨ drm_bridge_enter(9) ✨

okay so this is a page from the Kernel API Manual (yes, the kernel has lore too 💅) and it's all about drm_bridge_enter — the little gatekeeper that keeps your DRM bridge code from walking into a room after the bridge literally got unplugged. iconic behavior, honestly 🫶

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🌸 NAME 🌸

drm_bridge_enter — enter the DRM bridge critical section, bestie 🎀

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🦋 SYNOPSIS 🦋

bool drm_bridge_enter (struct drm_bridge *bridge , int *idx );

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💖 ARGUMENTS 💖

• bridge — the DRM bridge in question, your main character 🌟
• idx — a pointer to an index, and plot twist: that index gets passed along to the matching drm_bridge_exit. so like, keep track of it, it's going places ✨

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🔥 DESCRIPTION 🔥

so what this function does is mark and protect the beginning of a section — and the whole point of that section is that you should not enter it after the bridge has been unplugged. no cap. 💀

the end of that section gets marked with drm_bridge_exit. they're a matched set, they come as a pair, yin and yang, iykyk 🦋

and the cute part? calls to this function can be nested. yes queen, reentrancy, we love to see it 👑

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⭐ RETURN ⭐

• true — it's OK to enter the section, you're so valid, go off 💖
• false — nope, not OK, do not pass go, do not collect $200 🙈

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🌈 SEE ALSO 🌈

literally the whole friend group, fr fr — go read these too or you're missing out:

• the kernel file ./drivers/gpu/drm/drm_bridge.c overview(9)
• display driver integration(9)
• special care dsi(9)
• dsi bridge operations(9)
• bridge chain format selection(9)
• drm_bridge_exit(9)
• drm_bridge_unplug(9)
• drm_bridge_get(9)
• drm_bridge_put(9)
• drm_bridge_clear_and_put(9)
• drm_bridge_put_void(9)
• drm_bridge_add(9)
• devm_drm_bridge_add(9)
• drm_bridge_remove(9)
• drm_bridge_attach(9)
• bridge operations(9)
• drm_bridge_chain_mode_valid(9)
• drm_bridge_chain_mode_set(9)
• drm_atomic_bridge_chain_disable(9)
• drm_atomic_bridge_chain_post_disable(9)
• drm_atomic_bridge_chain_pre_enable(9)
• drm_atomic_bridge_chain_enable(9)
• drm_atomic_bridge_chain_check(9)
• drm_bridge_detect(9)
• drm_bridge_get_modes(9)
• drm_bridge_edid_read(9)
• drm_bridge_hpd_enable(9)
• drm_bridge_hpd_disable(9)
• drm_bridge_hpd_notify(9)
• of_drm_find_and_get_bridge(9)
• of_drm_find_bridge(9)
• of_drm_get_bridge_by_endpoint(9)
• devm_drm_put_bridge(9)

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ngl the whole squad showed up for this one 😭 read the bridge ones first, they're the closest friends 💜

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and that's the tea, bestie 🍓 this little page lives under ./drivers/gpu/drm, it's dated October 2026, and it's filed as drm_bridge_enter(9) — slay, go forth and enter your critical sections responsibly 💅✨🎀