drm_dp_tunnel_set_io_error(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_tunnel_set_io_error — like, the Kernel API Manual page, bestie ✨

okay so real talk, this is the manual page for drm_dp_tunnel_set_io_error(9) and it's genuinely not that deep — it's one function, it flips one flag, and it's kind of iconic for how much it just ends things 🎀

🌸 NAME 🌸

drm_dp_tunnel_set_io_error — sets the IO error flag for a DP tunnel, no cap 💅

✨ SYNOPSIS ✨

void drm_dp_tunnel_set_io_error (struct drm_dp_tunnel *tunnel );

that's it. that's the whole vibe check 🦋

🫶 ARGUMENTS 🫶

  • tunnel — the tunnel object in question. like, the tunnel. your main character 🎀

👑 DESCRIPTION 👑

so what this does is it sets the IO error flag for tunnel. that's the whole job and it does it slayfully 💅

Drivers can call this function when they detect a failure that affects the tunnel functionality — for example, after a DP AUX transfer failure on the port that tunnel is connected to. like, something went wrong on the wire and now the tunnel is having a moment 😭

⚠️ okay this part is important: setting this disables further management of tunnel, including any related AUX accesses for tunneling DPCD registers — those just return error to whoever initiated them. so yeah, the tunnel is done, periodt.

the driver is supposed to drop this tunnel and — optionally — recreate it. so like: let it go, then maybe build a new one if you feel like it 🦋✨

🔥 SEE ALSO 🔥

the kernel file lives at ./drivers/gpu/drm/display/drm_dp_tunnel.c — go read it iykyk 📖

and the whole friend group, in order, no skips:

that's the whole page bestie, go forth and handle your tunnel errors 🫶💖

— sign-off from ./drivers/gpu/drm/display 🌈, dated October 2026, and yeah the page itself is literally named drm_dp_tunnel_set_io_error(9) if you need to cite it 💅✨

📦 where this page comes from