pdc202xx_configure_piomode(9)

✨ pdc202xx_configure_piomode(9) ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is pdc202xx_configure_piomode — say that five times fast, i dare you 💅 don't worry, i'll walk you through it, it's actually not that deep.

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🎀 NAME 🎀

pdc202xx_configure_piomode — literally just sets the chip's PIO timing. that's it. that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

void pdc202xx_configure_piomode (struct ata_port *ap , struct ata_device
*adev , int pio );

no cap, that's the exact signature — copy it character for character or the compiler WILL come for you 😭

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💖 ARGUMENTS 💖

• ap — the ATA interface. your port, your problem 🫶
• adev — the ATA device. the little guy we're actually talking about ✨
• pio — the PIO mode. yes, as an int, don't ask 🙈

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🔥 DESCRIPTION 🔥

so this function gets called to do the PIO mode setup. iconic behaviour, love that for it 👑

but here's the tea ☕ and you NEED to hear this part: our timing registers are shared. like, shared shared. so if someone comes along and calls configure_dmamode, it will undo any work we do in here — and vice versa. it's giving toxic mutual destruction tbh 💀

⚠️ fr fr, the shared-register thing is not a joke: a configure_dmamode call wipes out what you did here, and this function wipes out what DMA mode set up. plan accordingly bestie 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/ata/pata_pdc202xx_old.c
• pdc202xx_set_piomode(9)
• pdc202xx_set_dmamode(9)
• pdc2026x_bmdma_start(9)
• pdc2026x_bmdma_stop(9)
• pdc2026x_dev_config(9)
• pdc2026x_check_atapi_dma(9)

go read them, they're all besties 🧚‍♀️

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and that's the whole page, mwah 💋 it lives in ./drivers/ata, the version tag says October 2026, and the title is pdc202xx_configure_piomode(9) in case you forgot already (you didn't, you're doing amazing 🍓). go slay some PIO timings, but remember the shared registers. periodt. 👑