dwc2_uframe_schedule_split(9)

💅 dwc2_uframe_schedule_split — Kernel API Manual energy ✨

okok bestie, buckle up, this one's living in the Kernel API Manual and it's genuinely a whole vibe 👑

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🎀 NAME 🎀

dwc2_uframe_schedule_split — schedule a QH for a periodic split xfer, periodt 💫

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🌸 SYNOPSIS 🌸

int dwc2_uframe_schedule_split (struct dwc2_hsotg *hsotg , struct
       dwc2_qh *qh );

literally right there, no cap 🫶

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🦋 ARGUMENTS 🦋

• hsotg — the HCD state structure for the DWC OTG controller. your main character struct fr 💜
• qh — the QH for the periodic transfer. the queue head in question, she's the one we're scheduling 🎀

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✨ DESCRIPTION ✨

okay so… this is the most complicated thing in USB. not me exaggerating, that's the actual lore 😭💀

we have to find matching time in both the global high speed schedule for the port and the low speed schedule for the TT associated with the given device. two schedules, one matching slot, bestie we are doing gymnastics 🧚✨

being here means that the host must be running in high speed mode and the device is in low or full speed mode (and behind a hub). iykyk 🌈

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👑 SEE ALSO 👑

🍓 Kernel file

• ./drivers/usb/dwc2/hcd_queue.c — go read the source, she's iconic 💖

💫 The whole friend group

• dwc2_periodic_channel_available(9)
• dwc2_check_periodic_bandwidth(9)
• pmap_schedule(9)
• pmap_unschedule(9)
• dwc2_get_ls_map(9)
• dwc2_qh_print(9)
• dwc2_qh_schedule_print(9)
• dwc2_ls_pmap_schedule(9)
• dwc2_ls_pmap_unschedule(9)
• dwc2_hs_pmap_schedule(9)
• dwc2_hs_pmap_unschedule(9)
• dwc2_uframe_schedule_hs(9)
• dwc2_uframe_schedule_ls(9)
• dwc2_uframe_schedule(9)
• dwc2_uframe_unschedule(9)
• dwc2_pick_first_frame(9)
• dwc2_do_reserve(9)
• dwc2_do_unreserve(9)
• dwc2_unreserve_timer_fn(9)
• dwc2_check_max_xfer_size(9)
• dwc2_schedule_periodic(9)
• dwc2_deschedule_periodic(9)
• dwc2_wait_timer_fn(9)
• dwc2_qh_init(9)
• dwc2_hcd_qh_create(9)
• dwc2_hcd_qh_free(9)
• dwc2_hcd_qh_add(9)
• dwc2_hcd_qh_unlink(9)
• dwc2_next_for_periodic_split(9)
• dwc2_next_periodic_start(9)
• dwc2_hcd_qtd_init(9)
• dwc2_hcd_qtd_add(9)

like, the entire friend group showed up to the group chat 🫶💜

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ngl this page is from the ./drivers/usb/dwc2 source and it's dated October 2026 — slay, future girlie behavior ⭐

okay that's the whole page bestie, you ate that reading session, go forth and schedule those splits 💅✨🎀🦋🌸🔥