intel_dp_mst...c_check_link(9)

✨ intel_dp_mst_atomic_check_link ✨

okay bestie, welcome to the Kernel API Manual page headed intel_dp_mst...c_check_link(9) — yes, that’s the header vibe. We’re doing a link-configuration check for every modeset MST output, and it’s giving very important CRTC recompute energy. 💅

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🌸 NAME 🌸

intel_dp_mst_atomic_check_link — check all modeset MST link configuration 🫶

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🎀 SYNOPSIS 🎀

int intel_dp_mst_atomic_check_link (struct intel_atomic_state *state ,
       struct intel_link_bw_limits *limits );

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🦋 ARGUMENTS 🦋

• state — intel atomic state. the main-character state object, no cap.
• limits — link BW limits. the bandwidth limits bestie, literally.

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💖 DESCRIPTION 💖

okay so this function checks the link configuration for all modeset MST outputs. If the configuration is invalid, limits will be updated if possible to reduce the total BW — and after that, the configuration for all CRTCs in state must be recomputed with the updated limits. periodt. 🔥

like, it’s not just “is this one link okay?” — it’s checking the whole modeset MST link situation, and if it can rescue things by lowering the total BW, it updates the limits and tells you to go recompute. iykyk.

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💀 RETURN 💀

• 0 — the configuration is valid. slay. ✅
• -EAGAIN — the configuration is invalid and limits got updated with fallback values, with which the configuration of all CRTCs in state must be recomputed. so: go recompute, bestie. 🔁
• Other negative error — the configuration is invalid without a fallback possibility, or the check failed for another reason. 😭

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/gpu/drm/i915/display/intel_dp_mst.c

• intel_dp_mst_add_topology_state_for_connector(9)
• intel_dp_mst_add_topology_state_for_crtc(9)
• intel_dp_mst_crtc_needs_modeset(9)
• intel_dp_mst_prepare_probe(9)

those are the linked besties — go read them too, fr fr. 🧚

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made with 💖 from the ./drivers/gpu/drm/i915/display source/version, dated October 2026, for intel_dp_mst...c_check_link(9). bye bestie 🫶