msm_dp_link...ning_request(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, buckle up, because we're diving into the Kernel API Manual and this page is genuinely a little icon. it's all about msm_dp_link_process_link_training_request — say that five times fast, i dare you 😭 — and it does exactly one thing but it does it well. let's get into it ✨

🌸 NAME 🌸

msm_dp_link_process_link_training_request — processes new training requests. that's it. that's the whole vibe. no cap, it's a one-liner and honestly? respect. 👑

🦋 SYNOPSIS 🦋

int msm_dp_link_process_link_training_request (struct
msm_dp_link_private *link );

so it hands you back an int (which, spoiler alert, is gonna be a 0 or a -EINVAL, more on that in a sec 💀) and it wants one struct msm_dp_link_private *link to work its magic on. classic. iconic. no notes. 💖

🎀 ARGUMENTS 🎀

  • link — the Display Port link data. that's your whole world here, bestie, it's the thing being poked and prodded and updated. treat it nice 🫶

✨ DESCRIPTION ✨

okay so here's the tea ☕ — this function handles new link training requests that are initiated by the sink. the sink is out here starting drama and this function is the one who answers the phone. main character energy fr fr. 🌈

what does it actually do, you ask? two things, and they're both serving:

  1. it updates the requested lane count and the link rate. 📈
  2. then it triggers the link retraining procedure. like, go off, king. 🔥

and the return value? listen carefully because this is the whole plot twist:

  • it returns 0 if a link training request has been processed ✅
  • otherwise it returns -EINVAL 🙈

so like, zero means "handled it, we're good, slay," and -EINVAL means "nope, wasn't a training request, bye." simple as that. no guessing, no extra lore, that's literally what the page says and i would never lie to you. 💅

🔍 SEE ALSO 🔍

the actual source lives here, in the kernel file:

  • ./drivers/gpu/drm/msm/dp/dp_link.c 👀

and here's the whole friend group, the entire squad of related functions — go say hi to all of them, they're all literally so valid:

ngl that's a lot of msm_dp_link_* functions and every single one of them is a baddie in her own right. iykyk. 🧚

💀 reminder bestie: the only two outcomes here are 0 and -EINVAL. don't go inventing a third one, i'm begging you, the manpage did not say that and we do not make things up in this group chat. 🙅‍♀️

okay that's the whole page, you ate that 🍓 — this lil cutie came straight out of the ./drivers/gpu/drm/msm/dp directory, dated October 2026, and it's filed under the Kernel API Manual, msm_dp_link...ning_request(9). mwah, love you, bye! 💜🦋💖

📦 where this page comes from