qcom_read_reg_dma(9)

💖 qcom_read_reg_dma(9) 💖

okay so bestie, we're in the Kernel API Manual today and this one is literally qcom_read_reg_dma — a little function that's about to eat and leave no crumbs. it reads registers. into a buffer. that's the vibe. let's get into it 🎀

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✨ NAME ✨

qcom_read_reg_dma — read a given number of registers to the reg_read_buf pointer 🫶

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🌸 SYNOPSIS 🌸

int qcom_read_reg_dma (struct qcom_nand_controller *nandc , int first ,
       int num_regs , unsigned int flags );

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🦋 ARGUMENTS 🦋

• nandc — the qpic nand controller, aka the main character of this whole operation 👑
• first — offset of the first register in the contiguous block. like, where we start. no cap, position matters 💅
• num_regs — number of registers to read. how many we're pulling. the count. the amount. iykyk ✨
• flags — flags to control DMA descriptor preparation. these are the little settings that tell the descriptor prep what kind of mood it should be in 🌈

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💜 DESCRIPTION 💜

so this function will prepare a descriptor to read a given number of contiguous registers, and it drops them right into the reg_read_buf pointer. that's it, that's the whole thing — it's giving "prep the descriptor, get the registers where they need to go" and honestly? iconic 🔥

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🧚 SEE ALSO 🧚

kernel file ./drivers/mtd/nand/qpic_common.c — go read it bestie, it's literally right there 🍓

and the whole friend group:

• qcom_free_bam_transaction(9)
• qcom_alloc_bam_transaction(9)
• qcom_clear_bam_transaction(9)
• qcom_qpic_bam_dma_done(9)
• qcom_nandc_dev_to_mem(9)
• qcom_prepare_bam_async_desc(9)
• qcom_prep_bam_dma_desc_cmd(9)
• qcom_prep_bam_dma_desc_data(9)
• qcom_prep_adm_dma_desc(9)
• qcom_write_reg_dma(9)
• qcom_read_data_dma(9)
• qcom_write_data_dma(9)
• qcom_submit_descs(9)
• qcom_clear_read_regs(9)
• qcom_nandc_unalloc(9)
• qcom_nandc_alloc(9)

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and that's the page bestie!! 💀💖 shoutout to the ./drivers/mtd/nand directory for hosting, October 2026 for the timestamp, and qcom_read_reg_dma(9) for being the moment. periodt. 💅✨🎀