drm_dp_tunn...x_lane_count(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_tunnel_max_dprx_lane_count — NAME ✨

Okay so bestie, welcome to the Kernel API Manual 🎀 — this one's called drm_dp_tunnel_max_dprx_lane_count, and it's literally here to query the maximum lane count of the tunnel's DPRX. That's it, that's the whole vibe. 🦋

🌸 SYNOPSIS 🌸

int drm_dp_tunnel_max_dprx_lane_count (const struct drm_dp_tunnel
*tunnel );

Like… that's the whole signature. Short king. 👑

✨ ARGUMENTS ✨

  • tunnel — the tunnel object 🫶 that's it, that's the argument, she's a const struct drm_dp_tunnel * and she's doing her best.

💖 DESCRIPTION 💖

So this function is the one you call when you need to ask: hey, what's the maximum lane count of the DPRX connected to tunnel? 🧚✨ And she will tell you. She's an icon, she answers.

But here's the important bit, and you must clock this: this lane count is not limited by the BW limit of the tunnel. Not even a little. Which is, like, the opposite of how the standard and extended DP_MAX_LANE_COUNT DPCD registers behave. So don't go assuming they match, because they do not, and that would be an embarrassing moment for you personally. 😭

Returns the maximum lane count. That's the return value. Slay. 💅

🦋 SEE ALSO 🦋

The kernel file lives at ./drivers/gpu/drm/display/drm_dp_tunnel.c — go read it, she's stunning. 🌈

And here's the whole tunnel friend group, all of them, no cap, every single one 🫶:

Ok that's the whole page, bestie, go forth and query those lane counts responsibly 💜

Mwah 💋 — this cutie came out of ./drivers/gpu/drm/display, dated October 2026, and it's filed under drm_dp_tunn...x_lane_count(9). Byeee! 🍓✨

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