triflex_bmdma_start(9)

💅 triflex_bmdma_start — like, the DMA start callback bestie

okay so real talk, this is a page from the Kernel API Manual, and the star of the show is triflex_bmdma_start(9). she's a callback. she starts DMA. she's iconic, she's specific, and she has opinions about timing. 🎀

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✨ SYNOPSIS ✨

void triflex_bmdma_start (struct ata_queued_cmd *qc );

that's it. that's the whole signature. no cap. 🦋

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🌸 ARGUMENTS 🌸

• qc — the command in progress, aka the main character of this whole operation 💖

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🔥 DESCRIPTION 🔥

okay so picture this: normally, drivers are out here setting the DMA timing right at the point where the set_dmamode call happens. standard behavior. everyone's doing it. it's giving routine. ✨

but Triflex? Triflex is not like the other drivers. 🙈 Triflex requires that we load new timings on the transition, or else keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc). like, the pairing matters. it's a whole vibe check situation and Triflex does not fail it. 💅

so here's what we do: we load the DMA timings just before starting DMA, and then we restore the PIO timing when the DMA is finished. load, start, restore. clean. efficient. obsessed. 🌟

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👑 SEE ALSO 👑

kernel file ./drivers/ata/pata_triflex.c, plus the whole squad:

• triflex_prereset(9)
• triflex_load_timing(9)
• triflex_set_piomode(9)
• triflex_bmdma_stop(9)

go read them, they're all part of the same friend group fr fr 🫶

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and that's the page, bestie!! brought to you by the fine folks at ./drivers/ata — that's the source/version, mwah — dated October 2026, and the section is triflex_bmdma_start(9). slay, go start some DMA. 🧚💜