drm_atomic_..._chain_check(9)

✨ drm_atomic_..._chain_check(9) ✨

okay so this is a page straight out of the Kernel API Manual, and it's giving "bridge chain atomic check" realness, bestie. buckle up 💅

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🎀 NAME 🎀

drm_atomic_bridge_chain_check — literally do an atomic check on the bridge chain, that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

int drm_atomic_bridge_chain_check (struct drm_bridge *bridge , struct
drm_crtc_state *crtc_state , struct drm_connector_state *conn_state );

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💖 ARGUMENTS 💖

• bridge — the bridge control structure, our main character 🫶
• crtc_state — the new CRTC state, fresh out of the box ✨
• conn_state — the new connector state, also new, also iconic 👑

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🔥 DESCRIPTION 🔥

okay so the order here is so important, listen. first you trigger a bus format negotiation, right? and then for all the bridges in the encoder chain you call the drm_bridge_funcs.atomic_check op — and if that's not there it just falls back on drm_bridge_funcs.mode_fixup, no big deal, she's flexible 💁‍♀️

and the direction?? you go from the last bridge to the first. yes, backwards, that's just how she rolls 💀

all of that happens before drm_encoder_helper_funcs.atomic_check gets called. so this is the pre-game, the warm-up, the little prelude before the main event 🎀 no cap.

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⭐ RETURN ⭐

• 0 when everything slays ✅
• a negative error code when it doesn't 😭 (failure era, we hate to see it)

ngl bestie, if you get a negative number back, that's your sign to go fix something.

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👑 SEE ALSO 👑

kernel file ./drivers/gpu/drm/drm_bridge.c, plus the whole friend group — go read these too fr fr:

• 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_pre_enable(9)
• drm_atomic_bridge_chain_enable(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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🌈 that's the whole page, you ate that. periodt. 💅

and that's a wrap bestie!! this one lives down in ./drivers/gpu/drm and it's dated October 2026 — go off, you're now officially fluent in bridge chain behavior 🧚‍♀️💜🍓