pch_udc_star...xt_txrequest(9)

💅 NAME 💅

pch_udc_start_next_txrequest — okay bestie, this is literally the function that starts the next transmission requirement ✨ (that's the whole description, don't come for me, it's what the manpage says 💀)

This one lives in the Kernel API Manual, so you already know it's giving kernel-dev main character energy 👑

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✨ SYNOPSIS ✨

void pch_udc_start_next_txrequest (struct pch_udc_ep *ep );

Returns nothing (void), takes exactly one thing. Minimalist. Iconic. Periodt 💅

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🫶 ARGUMENTS 🫶

• ep — the reference to the endpoint structure 🦋 like, it's a pointer to a struct pch_udc_ep, and that's the tea. That's who you hand over. No cap.

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👀 SEE ALSO 👀

Alright so this next bit is basically the whole group chat 💬 — the manpage points at the kernel file ./drivers/usb/gadget/udc/pch_udc.c plus a massive roll call of structs and functions. Not me dropping all of them, but every single one is here because we do not skip the boring parts in this house 🎀

The structs first, because they're the moment 💖

• struct pch_udc_data_dma_desc(9), struct pch_udc_stp_dma_desc(9), struct pch_udc_cfg_data(9)
• struct pch_udc_ep(9), struct pch_vbus_gpio_data(9), struct pch_udc_dev(9)
• struct pch_udc_request(9)

CSR / core-ish stuff 🌸

• pch_udc_csr_busy(9), pch_udc_write_csr(9), pch_udc_read_csr(9), pch_udc_rmt_wakeup(9)
• pch_udc_get_frame(9), pch_udc_clear_selfpowered(9), pch_udc_set_selfpowered(9)
• pch_udc_set_disconnect(9), pch_udc_clear_disconnect(9), pch_udc_reconnect(9)
• pch_udc_vbus_session(9)

All the endpoint setters, lowkey a whole collection 🦋

• pch_udc_ep_set_stall(9), pch_udc_ep_clear_stall(9), pch_udc_ep_set_trfr_type(9)
• pch_udc_ep_set_bufsz(9), pch_udc_ep_set_maxpkt(9), pch_udc_ep_set_subptr(9)
• pch_udc_ep_set_ddptr(9), pch_udc_ep_set_pd(9), pch_udc_ep_set_rrdy(9)
• pch_udc_ep_clear_rrdy(9)

DMA + interrupts, the serious ones 🔥

• pch_udc_set_dma(9), pch_udc_clear_dma(9), pch_udc_set_csr_done(9)
• pch_udc_disable_interrupts(9), pch_udc_enable_interrupts(9)
• pch_udc_disable_ep_interrupts(9), pch_udc_enable_ep_interrupts(9)
• pch_udc_read_device_interrupts(9), pch_udc_write_device_interrupts(9)
• pch_udc_read_ep_interrupts(9), pch_udc_write_ep_interrupts(9)

Status + control registers 🙈

• pch_udc_read_device_status(9)
• pch_udc_read_ep_control(9), pch_udc_clear_ep_control(9)
• pch_udc_read_ep_status(9), pch_udc_clear_ep_status(9)

NAK, flush, enable/disable 💜

• pch_udc_ep_set_nak(9), pch_udc_ep_clear_nak(9), pch_udc_ep_fifo_flush(9)
• pch_udc_ep_enable(9), pch_udc_ep_disable(9)
• pch_udc_wait_ep_stall(9)

Init / exit / PCD layer ⭐

• pch_udc_init(9), pch_udc_exit(9)
• pch_udc_pcd_get_frame(9), pch_udc_pcd_wakeup(9), pch_udc_pcd_selfpowered(9)
• pch_udc_pcd_pullup(9), pch_udc_pcd_vbus_session(9), pch_udc_pcd_vbus_draw(9)

VBUS GPIO squad 🍓

• pch_vbus_gpio_get_value(9), pch_vbus_gpio_work_fall(9), pch_vbus_gpio_work_rise(9)
• pch_vbus_gpio_irq(9), pch_vbus_gpio_init(9), pch_vbus_gpio_free(9)

Request helpers + DMA chain 🧚

• complete_req(9), empty_req_queue(9)
• pch_udc_free_dma_chain(9), pch_udc_create_dma_chain(9)
• prepare_dma(9), process_zlp(9)
• pch_udc_start_rxrequest(9)

Gadget-side PCD entry points 👑

• pch_udc_pcd_ep_enable(9), pch_udc_pcd_ep_disable(9)
• pch_udc_alloc_request(9), pch_udc_free_request(9)
• pch_udc_pcd_queue(9), pch_udc_pcd_dequeue(9)
• pch_udc_pcd_set_halt(9), pch_udc_pcd_set_wedge(9)
• pch_udc_pcd_fifo_flush(9)

Transfer completion + service handlers 🎀

• pch_udc_init_setup_buff(9)
• pch_udc_complete_transfer(9), pch_udc_complete_receiver(9)
• pch_udc_svc_data_in(9), pch_udc_svc_data_out(9)
• pch_udc_svc_control_in(9), pch_udc_svc_control_out(9)
• pch_udc_postsvc_epinters(9), pch_udc_read_all_epstatus(9)
• pch_udc_activate_control_ep(9)
• pch_udc_svc_ur_interrupt(9), pch_udc_svc_enum_interrupt(9)
• pch_udc_svc_intf_interrupt(9), pch_udc_svc_cfg_interrupt(9)
• pch_udc_dev_isr(9), pch_udc_isr(9)

Setup / reinit / pools, the finale 🌈

• pch_udc_setup_ep0(9), pch_udc_pcd_reinit(9), pch_udc_pcd_init(9)
• init_dma_pools(9)

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Lowkey the whole pch_udc.c file is in the SEE ALSO because everything in that driver is connected, iykyk 💀

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And that's the page, bestie! 🫶💖 This one came out of the Kernel API Manual source-path ./drivers/usb/gadget/udc, dated October 2026 — go read the real thing if you need the deep lore, and slay your kernel journey ✨💅🎀