intel_dp_in...nd_dprx_caps(9)

💅 intel_dp_init_lttpr_and_dprx_caps — the Kernel API Manual page you actually wanna read

okay so bestie, welcome to the Kernel API Manual entry for intel_dp_init_lttpr_and_dprx_caps — yes the title gets truncated in the header, it's giving "my name is too long for the group chat display name" energy 😭 but we move.

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✨ NAME ✨

intel_dp_init_lttpr_and_dprx_caps — this one literally detects LTTPR and DPRX caps and inits the LTTPR link training mode. no cap, that's the whole job 🫶

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✨ SYNOPSIS ✨

int intel_dp_init_lttpr_and_dprx_caps (struct intel_dp *intel_dp );

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✨ ARGUMENTS ✨

• intel_dp — the Intel DP struct. that's it, that's the argument 💅 it's the main character here.

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✨ DESCRIPTION ✨

So what this function actually does 👑 — it reads the LTTPR common capabilities and the DPRX capabilities, then switches over to non-transparent link training mode if it detects any LTTPR, and it reads the PHY capabilities for every detected LTTPR. obsessed with the thoroughness honestly 🌸

But bestie, sometimes life says no 🙈 — if there's an LTTPR detection error, or if the number of LTTPRs is more than is supported (that's 8, literally eight, that's the cap), it falls back to the no-LTTPR, transparent mode link training mode. graceful degradation slay ✨

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✨ RETURN ✨

• >0 — if LTTPRs were detected and the non-transparent LT mode was set. also, the DPRX capabilities are read out. winner winner 🎀
• 0 — if no LTTPRs were detected, or more than 8 LTTPRs were detected, or in case of a detection failure and the transparent LT mode was set. the DPRX capabilities are read out. still useful, lowkey chill vibes 🦋
• <0 — reading out the DPRX capabilities failed. it's giving sad girl hours 😭

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✨ SEE ALSO ✨

• Kernel file ./drivers/gpu/drm/i915/display/intel_dp_link_training.c
• DisplayPort link training(9)
• link_recovery_reset(9)
• intel_dp_stop_link_train(9)
• intel_dp_start_link_train(9)

the whole squad, fr fr 🫶 go read them, iykyk

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ok that's the page!! mwah 💖

source/version: ./drivers/gpu/drm/i915/display — and it's dated October 2026, so yeah she's from the future, main character energy only ⭐ see u next time bestie, bye!! 👑🌈💜