xhci_port_state_to_neutral(9)

📦 version 7.3.1, in nixpkgs unstable

💅 xhci_port_state_to_neutral(9) — like, the Kernel API Manual page, bestie 🎀

okay so real talk: this is from the Kernel API Manual, section 9, and it's about a lil function called xhci_port_state_to_neutral. she's small, she's specific, and she slays at one exact job. let's get into it ✨

🌸 NAME 🌸

xhci_port_state_to_neutral — cleaning up a value you read out of portsc so it's actually, y'know, writeable again 🧚

✨ SYNOPSIS ✨

u32 xhci_port_state_to_neutral (u32 portsc );

🦋 ARGUMENTS 🦋

  • portsc — a u32. it's the port value you read from the portsc register, and it's the thing that needs cleaning up. hand her over and she'll do the rest 💖

👑 DESCRIPTION 👑

so here's the vibe: you give this function a portsc, and what comes back is a value that would put the port in the same state if you wrote it to the port status control register. like, no cap, same port, same energy, but now it's safe to write 🔥

how does she pull that off? she:

  • saves the Read Only (RO) bits 🫶
  • saves the read/write bits where writing a 0 clears the bit and writing a 1 sets the bit — those are the RWS bits 💅

and for all other types — that's RW1S, RW1CS, RW, and RZ — writing a '0' has no effect. so she doesn't gotta worry about those, periodt ✨

⭐ RETURN ⭐

a u32 value that you can write straight back to the portsc register without changing the port state. iconic behavior, honestly 👑

🌈 SEE ALSO 🌈

ngl bestie, if you're poking at port state bits without reading this first, that's giving chaos main character energy 😭 read it, love it, respect the RO and RWS bits 🙈

mwah 💋 that's the whole page! she lives in ./drivers/usb/host, dated October 2026, and she is so worth the read. go be great with your portsc values, bestie 🍓💜

📦 where this page comes from