radisys_set_piomode(9)

💅 radisys_set_piomode — kernel API manual, but make it make sense ✨

okay bestie, so you found radisys_set_piomode(9) in the Kernel API Manual and you're like "what even is this" — don't worry, I got you, we're gonna get through this together 🫶

---

🌸 NAME 🌸

radisys_set_piomode — literally the function that initializes host controller PATA PIO timings 💫 no cap, that's the whole vibe

---

✨ SYNOPSIS ✨

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

it returns void, so like… nothing comes back. it just does things. main character energy honestly 👑

---

🎀 ARGUMENTS 🎀

• ap — an ATA port. that's it, that's the description, she's a simple girlie 🦋
• adev — the device whose timings we're configuring. yes queen, we're tuning her specifically 💅

---

💖 DESCRIPTION 💖

so what it actually does: sets the PIO mode for the device, inside the host controller's PCI config space. periodt. 🔥

LOCKING: None (inherited from caller). not me being casual about concurrency 😭 it literally says none — the locking comes from whoever called you, so don't go adding your own, iykyk 💀

---

🌈 SEE ALSO 🌈

peep the kernel file ./drivers/ata/pata_radisys.c and also these iconic siblings:

• radisys_set_dmamode(9)
• radisys_qc_issue(9)
• radisys_init_one(9)

they're all in the same friend group, go say hi 🧚

---

and that's the page!! 🎀 source situation: ./drivers/ata, dated October 2026, and the page itself is radisys_set_piomode(9) — slay, you're officially educated, go touch some kernel code bestie 💜🍓