drm_mode_is_420(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_mode_is_420 💅

okay bestie, so this is a page from the Kernel API Manual section 9, and it's about one tiny little function that answers one very specific question: can this videomode do YCBCR420 output or not? that's it. that's the whole gig. no cap. 🦋

✨ SYNOPSIS ✨

bool drm_mode_is_420 (const struct drm_display_info *display , const
struct drm_display_mode *mode );

so it takes two const pointers and hands you back a bool. that's the whole signature, she's not complicated, she just knows what she's about 💅

🎀 ARGUMENTS 🎀

  • display — the display that's under action rn, like the one being examined. she's the vibe check subject 👀
  • mode — the video mode you want tested. this is the one getting scrutinized, bestie 🔍

🌸 RETURN 🌸

  • true — slay! the mode can be supported in YCBCR420 format 💖
  • false — nope, not this one, the mode can't be supported in YCBCR420 format 🙈

literally just a yes-or-no, it's giving simple and iconic ✨

🦋 SEE ALSO 🦋

first up, the actual home of this function — the kernel file:

  • ./drivers/gpu/drm/drm_modes.c

and then, omg, the whole friend group 🫶 — every single one of these is (9) and every single one matters, so here's the full squad, no one gets left out:

bestie note: drm_mode_is_420_only(9) and drm_mode_is_420_also(9) are right there in the list and they are literally the siblings of this function. iykyk 👑

and that's the page!! 🎀 this little gem lives under ./drivers/gpu/drm and it's dated October 2026 — so yeah, mark your calendars bestie, she's coming 💜 ✨ 🍓

📦 where this page comes from