drm_dp_dpcd_probe(9)

📦 version 7.3.1, in nixpkgs unstable

✨ drm_dp_dpcd_probe(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's about drm_dp_dpcd_probe(9) — yes it's a mouthful, we're gonna get through it together 🫶

🌸 NAME 🌸

drm_dp_dpcd_probe — probe a given DPCD address with a 1-byte read access 💅

🎀 SYNOPSIS 🎀

int drm_dp_dpcd_probe (struct drm_dp_aux *aux , unsigned int offset );

🦋 ARGUMENTS 🦋

  • aux — the DisplayPort AUX channel (SST), like, the little chat line to the sink 💌
  • offset — the address of the register you're probing, iykyk 📍

💀 DESCRIPTION 💀

ok so what this literally does: it probes the DPCD address you handed it by reading 1 byte from that address. That's the whole vibe check 🔍

And here's the cute part — you can use this function to trigger some side-effect that the read access has, like waking up the sink, and you don't even need the read-out value at all. Not me reading just to poke the hardware awake 😭👑

Returns 0 if the read access succeeded, or a negative error code on failure. That's it, that's the tea ☕

🔥 SEE ALSO 🔥

the friend group is large, brace yourself 🫶

and that's the whole page, bestie, no notes 💅✨

this lil masterpiece lives in ./drivers/gpu/drm/display, dated October 2026 🗓️💜 — go forth and probe responsibly, mwah 🎀🦋

📦 where this page comes from