usb4_port_margining_caps(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_port_margining_caps(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for usb4_port_margining_caps(9), and honestly? she's a little icon. let's get into it 🎀

✨ NAME ✨

usb4_port_margining_caps — Read USB4 port margining capabilities 🦋

🌸 SYNOPSIS 🌸

int usb4_port_margining_caps (struct tb_port *port , enum usb4_sb_target
target , u8 index , u32 *caps , size_t ncaps );

like, that's the whole vibe. five arguments, one int coming back at you 💜

🍓 ARGUMENTS 🍓

  • port — the USB4 port, obvi. this is your main character 🌟
  • target — the sideband target 👀
  • index — the retimer index, but ONLY if target is USB4_SB_TARGET_RETIMER ⚠️ otherwise it's not doing that job, bestie
  • caps — an array with at least two elements where the results get parked 🅿️✨
  • ncaps — how many elements are actually chillin' in the caps array 🔢

💖 DESCRIPTION 💖

Reads the USB4 port lane margining capabilities into caps.

that's it, that's the whole paragraph. short and slays 💅 no cap.

🔥 RETURN 🔥

0 on success, negative errno otherwise 😭 (so like, if you see something negative, that's a no from her fr fr)

👑 SEE ALSO 👑

kernel file ./drivers/thunderbolt/usb4.c — go read her, iykyk 📖

and then the whole group chat of siblings, all of them (9):

like… that is a LOT of siblings and every one of them is invited to the party 🫶🎉

💀 real talk though: the index argument only means anything when target is USB4_SB_TARGET_RETIMER. don't be out here passing a retimer index for a non-retimer target, that's not the move 🙈

and that's the page, bestie!! 🌈⭐ this lil beauty comes to you from ./drivers/thunderbolt and she's dated October 2026 — put that in your calendar 🗓️💜 mwah, go read a kernel file, ily 🧚✨

📦 where this page comes from