bcm63xx_update_link_speed(9)

💅 bcm63xx_update_link_speed(9)

okay so this is a page from the Kernel API Manual, and we're talking about bcm63xx_update_link_speed, which is genuinely such a niche little function but like… it ate. let's get into it bestie 🫶

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✨ NAME ✨

bcm63xx_update_link_speed — check to see if the link speed has changed. that's it, that's the whole job, and honestly? iconic for it 💅

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🌸 SYNOPSIS 🌸

int bcm63xx_update_link_speed (struct bcm63xx_udc *udc );

yep, that's the whole signature. she's short, she's sweet, she takes exactly one pointer. periodt ✨

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🎀 ARGUMENTS 🎀

• udc — a reference to the device controller. like, the whole device controller. that's the vibe. 🦋

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💖 DESCRIPTION 💖

so the way this works: the link speed update coincides with a SETUP IRQ. yk, one of those interrupts. 🔥

and here's the lil payoff — it returns 1 if the speed has actually changed, so that the caller can go ahead and update the endpoint settings. it's giving "hey bestie, something moved, go fix your endpoints" 😭💀

no cap, just 1 means changed. the caller does the rest. it's a team effort fr fr.

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👑 SEE ALSO 👑

okay this list is long long, but every single one of these is part of the family so we're listing them all, no skipping, we don't do that here 🫶

the kernel file is ./drivers/usb/gadget/udc/bcm63xx_udc.c, and the structs up first:

• struct iudma_ch_cfg(9)
• struct iudma_ch(9)
• struct bcm63xx_ep(9)
• struct bcm63xx_req(9)
• struct bcm63xx_udc(9)

then the functions, in order, all of them, let's go ⭐

• bcm63xx_ep_dma_select(9)
• bcm63xx_set_stall(9)
• bcm63xx_fifo_setup(9)
• bcm63xx_fifo_reset_ep(9)
• bcm63xx_fifo_reset(9)
• bcm63xx_ep_init(9)
• bcm63xx_ep_setup(9)
• iudma_write(9)
• iudma_read(9)
• iudma_reset_channel(9)
• iudma_init_channel(9)
• iudma_init(9)
• iudma_uninit(9)
• bcm63xx_set_ctrl_irqs(9)
• bcm63xx_select_phy_mode(9)
• bcm63xx_select_pullup(9)
• bcm63xx_uninit_udc_hw(9)
• bcm63xx_init_udc_hw(9)
• bcm63xx_ep_enable(9)
• bcm63xx_ep_disable(9)
• bcm63xx_udc_alloc_request(9)
• bcm63xx_udc_free_request(9)
• bcm63xx_udc_queue(9)
• bcm63xx_udc_dequeue(9)
• bcm63xx_udc_set_halt(9)
• bcm63xx_udc_set_wedge(9)
• bcm63xx_ep0_setup_callback(9)
• bcm63xx_ep0_spoof_set_cfg(9)
• bcm63xx_ep0_spoof_set_iface(9)
• bcm63xx_ep0_map_write(9)
• bcm63xx_ep0_complete(9)
• bcm63xx_ep0_nuke_reply(9)
• bcm63xx_ep0_read_complete(9)
• bcm63xx_ep0_internal_request(9)
• bcm63xx_ep0_do_setup(9)
• bcm63xx_ep0_do_idle(9)
• bcm63xx_ep0_one_round(9)
• bcm63xx_ep0_process(9)
• bcm63xx_udc_get_frame(9)
• bcm63xx_udc_pullup(9)
• bcm63xx_udc_start(9)
• bcm63xx_udc_stop(9)
• bcm63xx_update_cfg_iface(9)
• bcm63xx_update_wedge(9)
• bcm63xx_udc_ctrl_isr(9)
• bcm63xx_udc_data_isr(9)
• bcm63xx_udc_init_debugfs(9)
• bcm63xx_udc_cleanup_debugfs(9)
• bcm63xx_udc_probe(9)
• bcm63xx_udc_remove(9)

and that's the whole gang. iykyk 🌈

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and that's the page!! this one lives over in ./drivers/usb/gadget/udc, dated October 2026 — mwah, tysm for reading, ily, go update those endpoint settings bestie 🧚💜🍓