drm_crtc_loa...555_from_888(9)

💖 drm_crtc_loa...555_from_888 (9) 💖

okay so bestie, welcome to the Kernel API Manual — yes the actual name, we're being fancy today 👑

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✨ NAME ✨

drm_crtc_load_gamma_555_from_888 — programs a gamma ramp for RGB555-like formats 🎀

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✨ SYNOPSIS ✨

void drm_crtc_load_gamma_555_from_888 (struct drm_crtc *crtc , const struct drm_color_lut *lut , drm_crtc_set_lut_func set_gamma );

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✨ ARGUMENTS ✨

• crtc — the CRTC that's doing the displaying, aka the main character here 💅
• lut — the gamma ramp you want programmed, the whole glow-up plan 🌈
• set_gamma — the callback that actually programs the hardware gamma LUT, the one who does the real work fr fr 🔥

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✨ DESCRIPTION ✨

So here's the vibe: this helper programs the gamma ramp you passed in lut straight into the hardware. 💫

But there's a catch, and it's giving important — the input gamma ramp must have 256 entries per color component. Like, non-negotiable. 🫶

Then the helper interpolates the individual color components to shrink the number of entries down to 5/5/5. That's the whole point of the _555_from_888 in the name, iykyk 😌✨

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✨ SEE ALSO ✨

• Kernel file ./drivers/gpu/drm/drm_color_mgmt.c
• overview(9)
• drm_color_ctm_s31_32_to_qm_n(9)
• drm_crtc_enable_color_mgmt(9)
• drm_mode_crtc_set_gamma_size(9)
• drm_crtc_supports_legacy_gamma(9)
• drm_crtc_legacy_gamma_set(9)
• drm_mode_gamma_set_ioctl(9)
• drm_mode_gamma_get_ioctl(9)
• drm_get_color_encoding_name(9)
• drm_get_color_range_name(9)
• drm_plane_create_color_properties(9)
• drm_color_lut_check(9)
• drm_crtc_load_gamma_888(9)
• drm_crtc_load_gamma_565_from_888(9)
• drm_crtc_fill_gamma_888(9)
• drm_crtc_fill_gamma_565(9)
• drm_crtc_fill_gamma_555(9)
• drm_crtc_load_palette_8(9)
• drm_crtc_fill_palette_332(9)
• drm_crtc_fill_palette_8(9)
• drm_color_lut32_check(9)

that's the whole squad, go read them all, they're all iconic in their own way 🦋🌸

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also real talk — the lut you pass in has to be 256 entries per component or the whole thing is a no 💀 don't come for me, it's literally in the description

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okay that's a wrap bestie!! 🌈✨ this page lives at ./drivers/gpu/drm and it's dated October 2026 — so yeah, it's a little time traveler, we love that for it 💜🎀🫶