it821x_passthru_bmdma_stop(9)

✨ NAME ✨

welcome to the Kernel API Manual, bestie — this page is all about it821x_passthru_bmdma_stop, the DMA stop callback. that's the whole name and honestly it's giving niche-kernel-icon energy 💅.

🌸 SYNOPSIS 🌸

okay so here's the exact signature, character for character:

void it821x_passthru_bmdma_stop (struct ata_queued_cmd *qc );

🎀 ARGUMENTS 🎀

• qc — ATA command. literally the ATA command being passed in, periodt.

🦋 DESCRIPTION 🦋

okay so here's the tea: we loaded new timings in dma_start, and as a result we need to restore the PIO timings in dma_stop so that the next command issue gets the right clock values. no cap, that's the whole plot — this DMA stop callback puts the PIO timing situation back where it needs to be for the next command 💖.

💜 SEE ALSO 💜

bestie, if you wanna follow the lore, the Kernel file is ./drivers/ata/pata_it821x.c, and the whole squad is:

• it821x_program(9)
• it821x_program_udma(9)
• it821x_clock_strategy(9)
• it821x_passthru_set_piomode(9)
• it821x_passthru_set_dmamode(9)
• it821x_passthru_bmdma_start(9)
• it821x_passthru_dev_select(9)
• it821x_smart_qc_issue(9)
• it821x_passthru_qc_issue(9)
• it821x_smart_set_mode(9)
• it821x_dev_config(9)
• it821x_read_id(9)
• it821x_check_atapi_dma(9)
• it821x_display_disk(9)
• it821x_firmware_command(9)
• it821x_probe_firmware(9)
• it821x_port_start(9)
• it821x_rdc_cable(9)

signing off from ./drivers/ata, October 2026, on the it821x_passthru_bmdma_stop(9) page — stay iconic, bestie 🫶✨