drm_dp_dpcd_write_payload(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_dpcd_write_payload(9) — like, the Kernel API Manual one, bestie

okay so real talk, this is a page straight out of the Kernel API Manual, and yes it's a kernel function page, but don't panic — it's actually so much chiller than it sounds. Sit down, grab a strawberry 🍓, we're gonna get you fluent in DisplayPort payload tables.

✨ NAME ✨

drm_dp_dpcd_write_payload — writes Virtual Channel info into the payload table. That's it, that's the whole vibe. 💫

🌸 SYNOPSIS 🌸

int drm_dp_dpcd_write_payload (struct drm_dp_aux *aux , int vcpid , u8
start_time_slot , u8 time_slot_count );

literally just four things going in, one int coming out. slay.

🎀 ARGUMENTS 🎀

  • aux — the DisplayPort AUX channel, aka the lil side-channel bestie that does all the talking 👑
  • vcpid — the Virtual Channel Payload ID, the name tag of the payload in question 🏷️
  • start_time_slot — where the payload starts its time slot, its entrance moment if you will ✨
  • time_slot_count — how many time slots it's taking up, its whole allotted era 💅

🦋 DESCRIPTION 🦋

so what actually happens: it writes the Virtual Channel payload allocation table, then checks the payload update status and retries as necessary until it's giving what it needs to give. no cap, the retry loop is the whole personality of this function 😭🫶

⭐ RETURN ⭐

  • 0 on success — we love a zero, main character energy 🎉
  • a negative error otherwise — not the vibe, but at least it tells you 🙈

🌈 SEE ALSO 🌈

grab a snack, this list is long, but every single one of these is a real friend of the family and we are NOT skipping anybody 🫶

💖 tiny sign-off before you go: this page lives under ./drivers/gpu/drm/display, dated October 2026, and it's part of the Kernel API Manual — that's the whole footer, but make it cute. bye bestie, go write some payload tables! 🧚‍♀️🎀
📦 where this page comes from