__is_lut_linear(9)

💅 NAME

__is_lut_linear — bestie, this one checks if the lut you handed it is just a linear mapping of values 👑

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✨ SYNOPSIS

bool __is_lut_linear (const struct drm_color_lut *lut , uint32_t size );

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🎀 ARGUMENTS

• lut — the given lut you want the vibes checked on, i.e. the one whose values get inspected 🫶
• size — the lut size, literally how big the thing is 💅

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🦋 DESCRIPTION

okay so here's the tea ☕ — a lut gets called linear when it represents this exact function:

f(a) = (0xFF00/MAX_COLOR_LUT_ENTRIES-1)a

...for integer a in [0, MAX_COLOR_LUT_ENTRIES). no cap, that's the whole criterion ✨ it's giving "does this table actually do anything or is it just standing there looking pretty" 💀

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⭐ RETURN

True if the given lut is a linear mapping of values — like, it acts like a bypass LUT and is basically main character energy doing absolutely nothing 🌸 otherwise, false 🙈

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🌈 SEE ALSO

the kernel file lives at ./drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c — go read it, iykyk 💜

and then the whole friend group:

• overview(9)
• amdgpu_dm_init_color_mod(9)
• __extract_blob_lut(9)
• __extract_blob_lut32(9)
• __drm_lut_to_dc_gamma(9)
• __drm_lut32_to_dc_gamma(9)
• __drm_ctm_to_dc_matrix(9)
• __drm_ctm_3x4_to_dc_matrix(9)
• __set_legacy_tf(9)
• __set_output_tf(9)
• __set_output_tf_32(9)
• __set_input_tf(9)
• __set_input_tf_32(9)
• amdgpu_dm_verify_lut3d_size(9)
• amdgpu_dm_verify_lut_sizes(9)
• amdgpu_dm_check_crtc_color_mgmt(9)
• amdgpu_dm_update_crtc_color_mgmt(9)
• amdgpu_dm_update_plane_color_mgmt(9)

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okay that's the page bestie, go forth and check those luts 🧚💖 this one comes from ./drivers/gpu/drm/amd/display/..., dated October 2026, and it's the __is_lut_linear(9) page — mwah, slay, periodt 💅✨