drm_atomic_b...n_pre_enable(9)

drm_atomic_b...n_pre_enable(9) 💅✨

okay so bestie, we’re in the Kernel API Manual and this page is literally called drm_atomic_b...n_pre_enable(9) — the full function name is giving main-character energy right below. 🫶

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🌸 NAME 🌸

drm_atomic_bridge_chain_pre_enable — prepares for enabling all bridges in the encoder chain. 💖

✨ SYNOPSIS ✨

void drm_atomic_bridge_chain_pre_enable (struct drm_bridge *bridge ,
       struct drm_atomic_commit *state );

🎀 ARGUMENTS 🎀

• bridge — bridge control structure 🫶
• state — atomic state being committed ✨

💅 DESCRIPTION 💅

So this one calls the drm_bridge_funcs.atomic_pre_enable op for all the bridges in the encoder chain, starting from the last bridge to the first. It’s giving reverse-order slay. 🔥 These are called before calling drm_encoder_helper_funcs.atomic_enable.

If a bridge sets pre_enable_prev_first, then the pre_enable for the prev bridge will be called before pre_enable of this bridge. That’s the whole vibe check. 🦋

🌈 EXAMPLE 🌈

Picture it:

Bridge A ---> Bridge B ---> Bridge C ---> Bridge D ---> Bridge E

With pre_enable_prev_first flag enable in Bridge B, D, E then the resulting pre_enable order would be, Bridge C, Bridge D, Bridge E, Bridge A, Bridge B. 👑

⭐ NOTE ⭐

tiny note, huge consequences: the bridge passed should be the one closest to the encoder. no cap. 💀

💜 SEE ALSO 💜

go read these next, bestie:

• 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_enter(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_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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mwah 💋 that’s the whole page! this one comes from the Kernel API Manual, source ./drivers/gpu/drm, date October 2026, and its page name is drm_atomic_b...n_pre_enable(9). byeee 🫶✨