cail_mc_write(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cail_mc_write — a whole kernel API manual moment

okay bestie, welcome to cail_mc_write(9), straight out of the Kernel API Manual. it's a kernel function, it writes an MC register, and it's honestly giving "small but mighty". let's get into it 🎀

✨ NAME ✨

cail_mc_write — write an MC (Memory Controller) register. that's it, that's the whole job. iconic behaviour, no notes 💖

🌸 SYNOPSIS 🌸

void cail_mc_write (struct card_info *info , uint32_t reg , uint32_t val
);

yes the spacing is a little chaotic, but she's valid C and we love her anyway 🫶

🦋 ARGUMENTS 🦋

  • info — an atom card_info pointer. your whole card's little info era 🌈
  • reg — the MC register offset. this is where we're writing, bestie 📍
  • val — the value to write to the pll register. (and yes, the page literally says "pll register" right there in the val line even though we're doing MC stuff — i'm just reporting what it says, don't come for me 😭💀)

👑 DESCRIPTION 👑

okay so here's the vibe: this function provides an MC register accessor for the atom interpreter, and that's for r4xx+. so like, Radeon 400-series and up, she's in her lane, doing her little register write 💅✨

that's genuinely the whole description. short, sweet, ate and left no crumbs 🔥

🧚 SEE ALSO 🧚

buckle up bestie, this list is long and we're keeping every single one of them, because every friend in this friend group matters 💜

first, the kernel file:

  • Kernel file ./drivers/gpu/drm/radeon/radeon_device.c

and now the whole crew, in order:

like i said. the whole crew. no cap 🫡

remember bestie: this is a kernel-side page ((9) is the section, iykyk), so these references are kernel API cross-refs, not the friendly user commands you type in your shell 🌸

and that's the page!! it lives under ./drivers/gpu/drm/radeon, it's stamped October 2026, and the page itself is cail_mc_write(9), so go forth and write those MC registers responsibly, mwah 💋🎀✨

📦 where this page comes from