sis_100_set_dmamode(9)

💅 NAME 💅

hiii bestie 💖 welcome to sis_100_set_dmamode(9) from the Kernel API Manual — section 9, and yes we are getting into kernel API lore today. This one is literally Initialize host controller PATA DMA timings ✨

✨ SYNOPSIS ✨

void sis_100_set_dmamode (struct ata_port *ap , struct ata_device *adev
);

🎀 ARGUMENTS 🎀

• ap — Port whose timings we are configuring, bestie. That's the port we're doing a little timing glow-up on 💅
• adev — Device to program. Yep, this is the device getting the programming treatment 🫶

🦋 DESCRIPTION 🦋

Okay so what this does is set the UDMA/MWDMA mode for the device, right in the host controller PCI config space. It handles UDMA66 and early UDMA100 devices — iconic range honestly 🌈

⚠️ LOCKING: None (inherited from caller). No cap, that's the locking situation, so don't go inventing locks that aren't there 😭

🌸 SEE ALSO 🌸

the kernel file ./drivers/ata/pata_sis.c is right here, plus these absolute legends:

• sis_old_port_base(9)
• sis_port_base(9)
• sis_133_cable_detect(9)
• sis_66_cable_detect(9)
• sis_pre_reset(9)
• sis_set_fifo(9)
• sis_old_set_piomode(9)
• sis_100_set_piomode(9)
• sis_133_set_piomode(9)
• sis_old_set_dmamode(9)
• sis_66_set_dmamode(9)
• sis_133_early_set_dmamode(9)
• sis_133_set_dmamode(9)
• sis_133_mode_filter(9)
• sis_init_one(9)

mwah 💋 this page lives in ./drivers/ata and is dated October 2026 — go be iconic with those DMA timings, bestie 🫶✨