drm_dp_downstream_debug(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_downstream_debug — like, the Kernel API Manual one, bestie 💅

okay so picture this: you're poking around the kernel's DRM/DisplayPort corner and you find drm_dp_downstream_debug(9) and you're like "what does this diva even do". Bestie. She debugs DP branch devices. That's it, that's the whole vibe. ✨

It lives in the Kernel API Manual section, and yes she's got the whole (9) situation going on, very official, very demure. 🎀

✨ SYNOPSIS ✨

void drm_dp_downstream_debug (struct seq_file *m , const u8
dpcd[DP_RECEIVER_CAP_SIZE] , const u8 port_cap[4] , const struct
drm_edid *drm_edid , struct drm_dp_aux *aux );

she's void, she returns nothing, she just does things. 💅 and yes, it's literally five arguments — let's meet them, they're all main characters. 🫶

🌸 ARGUMENTS 🌸

  • m — pointer for debugfs file. this is the lil output spot where the debug info goes, like her personal notes app fr fr. 🍓
  • dpcd — DisplayPort configuration data. the whole configuration situation, iconic. ⭐
  • port_cap — port capabilities. what the port can actually do, no cap. 🔥
  • drm_edid — EDID. the display's whole identity card basically. 👑
  • aux — DisplayPort AUX channel. the side-channel, the backstage pass, iykyk. 🌈

🦋 SEE ALSO 🦋

bestie there are SO many siblings, and honestly? obsessed with how many. every single one, no skipping, periodt. this all lives in the kernel file ./drivers/gpu/drm/display/drm_dp_helper.c and it's giving whole dp helpers(9) family reunion 💖

ngl that list ate and left no crumbs 😭 every one of those is a real function, and if you're gonna call this one you're probably gonna bump into them. go say hi. 🧚

okay that's the whole page, bestie!! mwah 💋 sign-off time: this lil beauty comes from ./drivers/gpu/drm/display, and she's dated October 2026, and she goes by drm_dp_downstream_debug(9) — remember her name, she's iconic 💜🦋✨

📦 where this page comes from