mpiix_set_piomode(9)

✨ NAME ✨

mpiix_set_piomode — set initial PIO mode data 🎀

okay so this page is from the Kernel API Manual, and the function is literally mpiix_set_piomode(9). bestie, we're setting up PIO mode data and it's giving kernel-internals realness 💅

🦋 SYNOPSIS 🦋

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

🎀 ARGUMENTS 🎀

• ap — ATA interface 💻
• adev — ATA device 🎀

💖 DESCRIPTION 💖

okay so this gets called to do the PIO mode setup. no cap. The MPIIX allows us to program the IORDY sample point (2-5 clocks), recovery (1-4 clocks), and whether prefetching or IORDY are used. that's the whole little timing menu ✨

This would get very ugly because we can only program timing for one device at a time, and the other gets PIO0. 😭 Fortunately, libata calls our qc_issue command before a command is issued, so we can flip the timings back and forth to reduce the pain. highkey iconic teamwork 🫶

🌈 SEE ALSO 🌈

• Kernel file ./drivers/ata/pata_mpiix.c 📁
• mpiix_qc_issue(9) 👑

okay that's the whole page, bestie 💖 source/version situation: ./drivers/ata; date: October 2026; and yeah the manual is Kernel API Manual and the function is mpiix_set_piomode(9). slay, go read the kernel file now 💅✨