it821x_passthru_bmdma_start(9)

💖 it821x_passthru_bmdma_start(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's a little function with main character energy and honestly? she's lowkey iconic. let's get into it ✨

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🎀 NAME 🎀

it821x_passthru_bmdma_start — the DMA start callback, no cap. literally what it says on the tin 💅

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🌸 SYNOPSIS 🌸

void it821x_passthru_bmdma_start (struct ata_queued_cmd *qc );

like... that's the whole signature. short, sweet, slays 🦋

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💜 ARGUMENTS 💜

• qc — bestie, this is the Command in progress. the whole entire command. she's in flight, she's doing her thing, and we're here for her 🫶

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🔥 DESCRIPTION 🔥

so here's the tea ☕ — usually drivers set the DMA timing right at the point where the set_dmamode call is made. standard behavior, nothing wild, everyone's chill.

BUT. IT821x is not like other chips. ngl she's highkey extra 💅 she requires that we load new timings on the transitions in some cases. like, mid-move, during the switch-up. that's her whole vibe, and this function is literally here to handle that. it's giving "I do things my own way" and honestly? respect 👑

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — go say hi to all of them:

• Kernel file ./drivers/ata/pata_it821x.c
• it821x_program(9)
• it821x_program_udma(9)
• it821x_clock_strategy(9)
• it821x_passthru_set_piomode(9)
• it821x_passthru_set_dmamode(9)
• it821x_passthru_bmdma_stop(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)

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and that's the page, bestie!! 🧚💖 this lil cutie lives over in ./drivers/ata, and the docs are stamped October 2026 — shoutout to the it821x_passthru_bmdma_start(9) girlies, we stan a transition-timing legend 🌟💀✨