STRUCT DWC2_GREGS_BACKUP(9)

💖 struct dwc2_gregs_backup(9) 💖

okay bestie, welcome to the Kernel API Manual — this page is literally all about struct dwc2_gregs_backup, and it is exactly what it sounds like: a little safe deposit box for the global registers state, kept around so you can put everything back the way it was before you go into partial power down. 🫶

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✨ NAME ✨

struct dwc2_gregs_backup — holds the global registers state before entering partial power down.

like, it's the screenshot you take of the registers before you yeet the hardware into low-power mode. no cap. 📸

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🎀 SYNOPSIS 🎀

struct dwc2_gregs_backup {
    u32 gintsts;
    u32 gotgctl;
    u32 gintmsk;
    u32 gahbcfg;
    u32 gusbcfg;
    u32 grxfsiz;
    u32 gnptxfsiz;
    u32 gi2cctl;
    u32 glpmcfg;
    u32 pcgcctl;
    u32 pcgcctl1;
    u32 gdfifocfg;
    u32 gpwrdn;
    bool valid;
 };

iconic struct, honestly. tysm for your service. 💅

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🌸 Members 🌸

okay so every single field is a backup of one register, and then there's valid doing the vibe check. here we go:

• gintsts — the backup of the GINTSTS register. yes queen, preserve those interrupt statuses. ⭐
• gotgctl — the backup of the GOTGCTL register.
• gintmsk — the backup of the GINTMSK register. your interrupt masks, safely tucked in. 💜
• gahbcfg — the backup of the GAHBCFG register.
• gusbcfg — the backup of the GUSBCFG register.
• grxfsiz — the backup of the GRXFSIZ register.
• gnptxfsiz — the backup of the GNPTXFSIZ register.
• gi2cctl — the backup of the GI2CCTL register.
• glpmcfg — the backup of the GLPMCFG register.
• pcgcctl — the backup of the PCGCCTL register.
• pcgcctl1 — the backup of the PCGCCTL1 register.
• gdfifocfg — the backup of the GDFIFOCFG register.
• gpwrdn — the backup of the GPWRDN register.
• valid — a bool, true if the register values are backuped. yup, that's the flag that tells you the save file actually got written. 💾✨

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🦋 SEE ALSO 🦋

kernel file ./drivers/usb/dwc2/core.h — and the whole friend group:

• struct dwc2_hsotg_ep(9)
• struct dwc2_hsotg_req(9)
• struct dwc2_core_params(9)
• struct dwc2_hw_params(9)
• struct dwc2_dregs_backup(9)
• struct dwc2_hregs_backup(9)
• struct dwc2_hsotg(9)

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ngl, read the others too — struct dwc2_dregs_backup(9) and struct dwc2_hregs_backup(9) are literally this struct's siblings, iykyk. 🧚

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that's the whole page, bestie — sourced straight from ./drivers/usb/dwc2, dated October 2026, and filed under struct dwc2_gregs_backup(9). go forth and back up those global registers. 🌈👑🔥