it821x_passthru_set_piomode(9)

📦 version 7.3.1, in nixpkgs unstable

💅 it821x_passthru_set_piomode(9) — the kernel API manual, bestie edition

okay so this is a page from the Kernel API Manual, and the function we're stanning today is it821x_passthru_set_piomode. yes it's a mouthful. no we're not shortening it. periodt. 🎀

✨ NAME ✨

it821x_passthru_set_piomode — set PIO mode data

like, that's the whole job. it sets PIO mode data. iconic behavior honestly. 🦋

✨ SYNOPSIS ✨

void it821x_passthru_set_piomode (struct ata_port *ap , struct
       ata_device *adev );

so it returns void — nothing comes back out, it just Does The Thing — and it takes two struct pointers. keep the spacing exactly like that, *ap , and all, we don't edit here. 💅

✨ ARGUMENTS ✨

  • ap — the ATA interface. this is your port, your main character. 🫶
  • adev — the ATA device. the little guy hanging off it. 🌸

✨ DESCRIPTION ✨

Configure for PIO mode. that's it, that's the goal. but ngl bestie, it's complicated — the register is shared by PIO and MWDMA, and it's shared across both channels too. 😭 so like, you can't just go poking at it all willy-nilly, there's other stuff living in there. the way that one register has to serve multiple masters... it's giving roommate situation. 💀

no cap, when a doc says "this is complicated" that's the kernel politely telling you to pay attention. 🙈

✨ SEE ALSO ✨

Kernel file ./drivers/ata/pata_it821x.c

and the whole friend group, all present and accounted for, in exactly this order:

and that's the page!! 🎉 it lives under ./drivers/ata, it's dated October 2026, and it's serving full it821x_passthru_set_piomode(9) realness. go read the source, ily, bye bestie 💖✨🧚

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