dwc3_prepare_one_trb(9)

✨ dwc3_prepare_one_trb(9) ✨

okay so bestie, welcome to the dwc3_prepare_one_trb page from the Kernel API Manual 💖 this one's short and sweet — literally just "setup one TRB from one request" — but it's lowkey important, so let's get into it 🫶

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🌸 NAME 🌸

dwc3_prepare_one_trb — setup one TRB from one request ✨

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🦋 SYNOPSIS 🦋

void dwc3_prepare_one_trb (struct dwc3_ep *dep , struct dwc3_request
*req , unsigned int trb_length , unsigned int chain , unsigned int node
, bool use_bounce_buffer , bool must_interrupt );

like, yes, seven whole arguments, she's got a lot going on and we respect it 💅

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🎀 ARGUMENTS 🎀

• dep — the endpoint for which this request is prepared 🧚
• req — a dwc3_request pointer, iykyk
• trb_length — buffer size of the TRB, aka how much we're fitting in there
• chain — should this TRB be chained to the next? yes/no moment fr fr
• node — only for isochronous endpoints. the first TRB needs a different type 👀
• use_bounce_buffer — set to use bounce buffer 🏀
• must_interrupt — set to interrupt on TRB completion ⚡

no cap, that node one is the sneaky one — it only matters for isochronous endpoints, and only because the first TRB needs a different type. don't sleep on it 🙈

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🔥 SEE ALSO 🔥

Kernel file ./drivers/usb/dwc3/gadget.c — and here's the whole friend group 💜:

• dwc3_gadget_set_test_mode(9)
• dwc3_gadget_get_link_state(9)
• dwc3_gadget_set_link_state(9)
• dwc3_ep_inc_trb(9)
• dwc3_ep_inc_enq(9)
• dwc3_ep_inc_deq(9)
• dwc3_gadget_giveback(9)
• dwc3_send_gadget_generic_command(9)
• dwc3_send_gadget_ep_cmd(9)
• dwc3_gadget_start_config(9)
• dwc3_gadget_calc_tx_fifo_size(9)
• dwc3_gadget_calc_ram_depth(9)
• dwc3_gadget_clear_tx_fifos(9)
• __dwc3_gadget_ep_enable(9)
• __dwc3_gadget_ep_disable(9)
• dwc3_ep_prev_trb(9)
• dwc3_prepare_last_sg(9)
• __dwc3_stop_active_transfer(9)
• dwc3_gadget_start_isoc_quirk(9)
• dwc3_gadget_setup_nump(9)
• dwc3_gadget_check_config(9)
• dwc3_gadget_init(9)

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and that's the whole page, bestie!! 🌈⭐

this lil icon lives over in ./drivers/usb/dwc3, dated October 2026, and she goes by dwc3_prepare_one_trb(9) — go off, queen 👑💅