intel_scu_ipc_dev_update(9)

💅 intel_scu_ipc_dev_update(9) — the kernel API glow-up you didn't know you needed

Okay bestie, so this is a page from the Kernel API Manual, and it's literally about updating one tiny register on Intel SCU IPC stuff. No cap, it's giving "small but iconic." Let's get into it ✨

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🌸 NAME 🌸

intel_scu_ipc_dev_update — update a register, periodt. That's the whole vibe.

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🎀 SYNOPSIS 🎀

int intel_scu_ipc_dev_update (struct intel_scu_ipc_dev *scu , u16 addr ,
u8 data , u8 mask );

Like, that's the whole signature. Copy it exactly or don't come for me 🙈

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🦋 ARGUMENTS 🦋

• scu — the optional SCU IPC instance. It's optional, so no pressure, but like… it's there if you need it 💁‍♀️
• addr — the register address. Basically the coordinates of where the magic happens.
• data — the bits you wanna update. The actual content, the main character energy.
• mask — the mask of bits to update. This is the bouncer at the club deciding which bits get in and which bits stay outside.

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✨ DESCRIPTION ✨

So basically, this function does a read-modify-write on a power control unit register. Fancy, right? The first data argument has to be the register value, and the second one is the mask value. The mask is a bitmap that tells you which bits to update. Let me spell it out so there's zero confusion:

• 0 = masked. Don't modify this bit. Like, hands off, not today 💅
• 1 = modify this bit. Go off, queen 👑

And it returns 0 on success or an error code if things go sideways. We love a clear return value.

⚠️ Heads up bestie: this function may sleep. So don't call it from somewhere where sleeping is illegal, okay? Also, locking between SCU accesses is handled for the caller — so you don't have to stress about that, it's literally done for you. Slay.

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🔥 SEE ALSO 🔥

Okay so if you wanna go deeper (and why wouldn't you), here's the whole squad:

• Kernel file ./drivers/platform/x86/intel_scu_ipc.c
• intel_scu_ipc_dev_get(9)
• intel_scu_ipc_dev_put(9)
• devm_intel_scu_ipc_dev_get(9)
• intel_scu_ipc_dev_ioread8(9)
• intel_scu_ipc_dev_iowrite8(9)
• intel_scu_ipc_dev_readv(9)
• intel_scu_ipc_dev_writev(9)
• intel_scu_ipc_dev_simple_command(9)
• intel_scu_ipc_dev_command_with_size(9)
• __intel_scu_ipc_register(9)
• intel_scu_ipc_unregister(9)
• __devm_intel_scu_ipc_register(9)

Like, that's the whole friend group. Go say hi 🫶

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💖 cute sign-off 💖

This iconic little page comes from ./drivers/platform/x86, dated October 2026, and it's literally the intel_scu_ipc_dev_update(9) manual page. You're welcome, bestie. Now go update some registers responsibly 💅✨