drm_dp_lttp...imeout_setup(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_lttp...imeout_setup(9) 💅

okay bestie, buckle up — this page is drm_dp_lttp...imeout_setup(9) and it comes to you live from the Kernel API Manual (section 9, where all the kernel-function girlies live ✨). real function name is drm_dp_lttpr_wake_timeout_setup, the header just cut her off mid-vowel, we don't judge 💖

✨ NAME ✨

drm_dp_lttpr_wake_timeout_setup — she grants extended time for the sink to wake up 🫶 basically the snooze button but make it DisplayPort.

🌸 SYNOPSIS 🌸

void drm_dp_lttpr_wake_timeout_setup (struct drm_dp_aux *aux , bool
transparent_mode );

that line break is canon, do not come for me 😭

🎀 ARGUMENTS 🎀

  • aux — the DP AUX channel you're working with. the aux channel. THE one. know her, love her 💅
  • transparent_mode — a bool, and it's true when lttpr is in transparent mode. that's it, that's the whole vibe check 👑

🦋 DESCRIPTION 🦋

so here's the tea, bestie: this function checks if the sink needs any extended wake time, and if it does — she grants that request. generous queen 👑✨

once this setup is done, the source device can keep trying the Aux transaction all the way up till the granted wake timeout. no cap, she'll wait for you 🫶

⚠️ and now the important part, listen closely: if this function is not called, all Aux transactions are expected to take a default of 1ms before they throw an error. 1ms. that's the whole window. one millisecond. so like… call her. 😭💀

🔗 SEE ALSO 🔗

literally the entire friend group, she knows everyone. starting with the kernel file herself:

the source file + the helpers

  • ./drivers/gpu/drm/display/drm_dp_helper.c
  • dp helpers(9)
  • drm_dp_phy_name(9)
  • dp helpers(9) — yes it's listed twice, that's canon, she said it twice on purpose 💅

DPCD girlies

downstream squad

aux lifecycle + desc

DSC corner 🍓

LTTPR besties (her literal family)

test patterns + SDPs

PCON / FRL crew 🌈

backlight babes ✨

bandwidth math girlies 🧚

k that's the whole page, mwah 💖 this one lives in ./drivers/gpu/drm/display and the date stamp says October 2026 — so yeah, she's from the future, main character energy fr fr. go call drm_dp_lttpr_wake_timeout_setup before your Aux transactions get ghosted in 1ms 😭👑

📦 where this page comes from