usb4_dp_por...te_bandwidth(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_dp_port_allocate_bandwidth(9) ✨

okay bestie, welcome to the Kernel API Manual 🎀 — this one's a short lil function but she's important, so let's get into it 🫶

🌸 NAME 🌸

usb4_dp_port_allocate_bandwidth — the one that sets the allocated bandwidth, periodt 💅

⭐ SYNOPSIS ⭐

int usb4_dp_port_allocate_bandwidth (struct tb_port *port , int bw );

🦋 ARGUMENTS 🦋

  • port — the DP IN adapter. that's your little handle into the DisplayPort-in side of things, iykyk 🔌
  • bw — the new allocated bandwidth, measured in Mb/s. yes, megabytes-per-second style, that's the unit, don't come for me 😭

💖 DESCRIPTION 💖

so what she actually does 👑: she communicates the new allocated bandwidth with the DPCD (that's the graphics driver 💻✨) — like, she slides into the DPCD's DMs and is like "hey bestie, here's the new number" 📨

and the way she does it? she takes into account the programmed granularity 🧐 — so the value doesn't just get dumped raw, it respects whatever granularity was set up beforehand. it's giving thoughtful, it's giving considerate 🌸

🔥 RETURN 🔥

  • 0 on success — slay, we ate 💅✨
  • a negative errno otherwise — not slay, something went sideways, check your errno 😭💀

🌈 SEE ALSO 🌈

the whole friend group 🫶 — kernel file ./drivers/thunderbolt/usb4.c plus literally the entire extended fam:

💀 friendly reminder bestie: a negative errno is not a vibe. always check it, no cap.

and that's the whole page, mwah 😘🫶 this little love letter lives under ./drivers/thunderbolt and it's timestamped October 2026 — see you in the kernel source, bestie 🌟💜✨

📦 where this page comes from