drm_dp_link_choose(9)

💅 drm_dp_link_choose(9) — like, the Kernel API Manual page you actually wanna read

okay bestie, so this page lives in the Kernel API Manual and it's all about drm_dp_link_choose — literally the function that picks the ✨cheapest✨ link setup that still works for your mode. Iconic behavior tbh.

---

🌸 SYNOPSIS 🌸

int drm_dp_link_choose (struct drm_dp_link *link , const struct
       struct drm_display_mode *mode , const struct drm_display_info *info );

that's the whole signature, no cap. 🫶

---

🎀 ARGUMENTS 🎀

• link — your DRM DP link object, the main character here 💅
• mode — the DRM display mode you're trying to feed
• info — the DRM display information, i.e. the receipts on what the display can do

---

✨ DESCRIPTION ✨

so per the eDP spec, a source is supposed to select a configuration with the lowest number of lanes and the lowest possible link rate that still matches the bitrate requirements of a video mode. lowkey minimalist queen energy: least lanes, slowest rate, still slays the mode. 🔥

but — and this is the important part, don't skip it — it must ensure it does not exceed the capabilities of the sink. like, no overpromising. the sink said what it said and we respect it. 🫶

---

🦋 RETURN 🦋

0 on success, or a negative error code on failure. that's it, that's the whole vibe check. 🎀

ngl, always check that return value bestie — negative means something went sideways 😭

---

💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/drm/tegra/dp.c
• drm_dp_link_add_rate(9)
• drm_dp_link_remove_rate(9)
• drm_dp_link_update_rates(9)
• drm_dp_link_probe(9)
• drm_dp_link_configure(9)
• Link training(9)
• drm_dp_link_train_init(9)
• drm_dp_link_train(9)

the whole friend group fr fr, go read them too 💖

---

okay that's the page!! sign-off time: it comes from ./drivers/gpu/drm/tegra, dated October 2026, and the page itself is drm_dp_link_choose(9) out of the Kernel API Manual. periodt. 🌈⭐