pdc2027x_cable_detect(9)

💅 pdc2027x_cable_detect(9) — the Kernel API Manual, bestie edition 🎀

Okay so we're in the pdc2027x_cable_detect(9) page from the Kernel API Manual, and honestly? It's a little baddie of a function that just wants to know what kind of cable you're running. Let's get into it ✨

🌸 NAME 🌸

pdc2027x_cable_detect — it probes your host controller for cable detect info, no cap 🕵️‍♀️

🦋 SYNOPSIS 🦋

int pdc2027x_cable_detect (struct ata_port *ap );

💖 ARGUMENTS 💖

• ap — the port you're curious about, like, the one you want the cable detect info for. That's it, that's the whole vibe check 🫶

👑 DESCRIPTION 👑

So what it actually does: it reads the 80c cable indicator out of the Promise extended register. Iconic. Obsessed.

And here's the tea ☕ — that register gets latched when the system is reset. So it's a little snapshot from reset time, not a live feed, iykyk.

LOCKING: None. Nope. Zero. It's inherited from the caller, so whoever called this function is the main character holding the lock responsibilities 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/ata/pata_pdc2027x.c — go read the source, it's giving lore 🧚

• port_mmio(9)
• dev_mmio(9)
• pdc2027x_port_enabled(9)
• pdc2027x_prereset(9)
• pdc2027x_mode_filter(9)
• pdc2027x_set_piomode(9)
• pdc2027x_set_dmamode(9)
• pdc2027x_set_mode(9)
• pdc2027x_check_atapi_dma(9)
• pdc_read_counter(9)
• pdc_adjust_pll(9)
• pdc_detect_pll_input_clock(9)
• pdc_hardware_init(9)
• pdc_ata_setup_port(9)
• pdc2027x_init_one(9)

That's the whole page, bestie — slay 💅 This cutie lives in ./drivers/ata, and the page is dated October 2026 🌸 Go forth and detect those cables, fr fr 💜🦋