drm_dp_aux_init(9)

📦 version 7.3.1, in nixpkgs unstable

✨ drm_dp_aux_init(9) ✨

okay so this is from the Kernel API Manual, and it's literally the glow-up guide for your DisplayPort AUX channel. bestie, if you've ever been like "how do I even talk to my aux before it's famous?" — this is the page for you. 💅

🌸 NAME 🌸

drm_dp_aux_init — minimally initialise an aux channel

🦋 SYNOPSIS 🦋

void drm_dp_aux_init (struct drm_dp_aux *aux );

🎀 ARGUMENTS 🎀

  • aux — the DisplayPort AUX channel. that's your girl. 👑

💖 DESCRIPTION 💖

so here's the vibe: if you need to use the drm_dp_aux's i2c adapter before you register it with the outside world, you gotta call drm_dp_aux_init first. like, it's the pre-game. no cap. ✨

now, for drivers that are grandparents to their AUX adapters (think: the AUX adapter is parented by a drm_connector), you still have to call drm_dp_aux_register once the connector has been registered — that's what lets userspace actually access the auxiliary DP channel. don't skip that step, bestie, it's giving "almost finished but forgot the last thing." 😭

likewise, for those same drivers, you should also assign drm_dp_aux.drm_dev as early as possible. why? so that the drm_device that corresponds to the AUX adapter can be mentioned in debugging output from the DRM DP helpers. it's just good manners, honestly. 🫶

and for devices that use a separate platform device for their AUX adapters? you can call this as early as the driver requires. literally whenever. it's flexible like that. 🌈

⭐ SEE ALSO ⭐

okay this list is long but we're gonna get through it together. every single one, periodt. 🔥

💀 lowkey this list is a whole mood but every single one is important, iykyk.

okay that's the whole page! this lil guy lives in ./drivers/gpu/drm/display and it's dated October 2026 — so like, future vibes but make it kernel. stay slay, bestie. 🧚💜🎀

📦 where this page comes from