STRUCT DWC2_HREGS_BACKUP(9)

💅 struct dwc2_hregs_backup(9) — a little kernel-API moment 🎀

okay so bestie, welcome to the <pink>Kernel API Manual</pink> ✨ — this one's a struct page, and it's honestly serving "save file before you do something risky" energy 🫶

🌸 NAME 🌸

struct dwc2_hregs_backup — literally just holds host registers state before entering partial power down 💤👑

no cap, that's the whole vibe: snapshot the host registers before the lights go down.

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✨ SYNOPSIS ✨

here's the struct, copied exactly bestie, don't come for me 👇

struct dwc2_hregs_backup {
    u32 hcfg;
    u32 hflbaddr;
    u32 haintmsk;
    u32 hcchar[MAX_EPS_CHANNELS];
    u32 hcsplt[MAX_EPS_CHANNELS];
    u32 hcintmsk[MAX_EPS_CHANNELS];
    u32 hctsiz[MAX_EPS_CHANNELS];
    u32 hcidma[MAX_EPS_CHANNELS];
    u32 hcidmab[MAX_EPS_CHANNELS];
    u32 hprt0;
    u32 hfir;
    u32 hptxfsiz;
    bool valid;
 };

like… it's giving Pokémon storage box but for hardware registers 🧚💜

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🎀 Members 🎀

the way that every single one of these is a backup… obsessed 😭

• hcfg — backup of the HCFG register 💅
• hflbaddr — backup of the HFLBADDR register 💅
• haintmsk — backup of the HAINTMSK register 💅
• hcchar — backup of the HCCHAR register 💅
• hcsplt — backup of the HCSPLT register 💅
• hcintmsk — backup of the HCINTMSK register 💅
• hctsiz — backup of the HCTSIZ register 💅
• hprt0 — backup of the HPTR0 register 💅
• hfir — backup of the HFIR register 💅
• hptxfsiz — backup of the HPTXFSIZ register 💅
• valid — True if registers values backuped 🫶 (yes, the manpage says "backuped", we respect the original text on this blog 🫡)

🙈 quick vibe check: hcchar, hcsplt, hcintmsk, hctsiz, hcidma, and hcidmab are all declared as u32 ...[MAX_EPS_CHANNELS] in the struct up top — the Members list names the first four of those, and hcidma / hcidmab are in the struct without their own member blurbs. iykyk 💀

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🌈 SEE ALSO 🌈

go read these next bestie, they're all in the kernel file ./drivers/usb/dwc2/core.h ✨:

• struct dwc2_hsotg_ep(9)
• struct dwc2_hsotg_req(9)
• struct dwc2_core_params(9)
• struct dwc2_hw_params(9)
• struct dwc2_gregs_backup(9)
• struct dwc2_dregs_backup(9)
• struct dwc2_hsotg(9)

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that's the whole page, main character energy achieved 👑 <hotpink>./drivers/usb/dwc2</hotpink> came through with this one in <purple>October 2026</purple>, and yes the page is literally titled struct dwc2_hregs_backup(9) — slay, bye bestie 💖🦋🌸