drm_scdc_write(9)

💅 drm_scdc_write(9) — the kernel API manual, bestie edition 🎀

okay so real talk, this one lives in the Kernel API Manual and it is literally the little function that shoves a block of data into SCDC. tiny function, big main character energy. let's get into it ✨

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🌸 NAME 🌸

drm_scdc_write — write a block of data to SCDC 💖

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✨ SYNOPSIS ✨

ssize_t drm_scdc_write (struct i2c_adapter *adapter , u8 offset , const
       void *buffer , size_t size );

that's the whole vibe. four args, one return, no cap. 🫶

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🎀 ARGUMENTS 🎀

• adapter — the I2C controller, aka the thing doing the actual talking 🔌
• offset — where the block starts, the start offset of the block you're writing 📍
• buffer — the block of data itself, the payload, the moment 💅
• size — how big that block is, the size of the block to write 📏

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🦋 DESCRIPTION 🦋

so basically: it writes a block of data to SCDC, starting at a given offset. that's it, that's the whole plot. iconic behaviour, honestly. ✨

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🌈 RETURN 🌈

• 0 on success 🎉
• a negative error code on failure 😭

ngl bestie, check that return value. 0 is the slay, negative is the "not me crying" 💀

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/display/drm_scdc_helper.c — the scdc helpers(9) live here, go say hi 🧚
• drm_scdc_read(9)
• drm_scdc_get_scrambling_status(9)
• drm_scdc_set_scrambling(9)
• drm_scdc_set_high_tmds_clock_ratio(9)

lowkey the whole scdc squad right there 👑

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and that's the page, bestie 🍓 it comes from the kernel source tree at ./drivers/gpu/drm/display, dated October 2026, and it's filed under drm_scdc_write(9) — mwah, go write some blocks 💜🫶