dm_test_set_..._tf_identity(9)

✨ dm_test_set_legacy_tf_identity — Kernel API Manual ✨

Okay bestie, so this is a page out of the Kernel API Manual, section 9 (that's the kernel-facing one, iykyk 💅), and it's all about one very specific little test helper. Let's get into it 🫶

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🌸 NAME 🌸

dm_test_set_legacy_tf_identity — the legacy identity LUT that uses the sRGB ROM path. That's the whole vibe, fr fr ✨

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🦋 SYNOPSIS 🦋

void dm_test_set_legacy_tf_identity (struct kunit *test );

That's it. One argument. No hidden extras. Slay 💅

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🎀 ARGUMENTS 🎀

• test — the KUnit test context. Yep, that's the standard one you always see passed around in KUnit land 👑

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🔥 SEE ALSO 🔥

So bestie, there is a lot of related stuff here — and by a lot I mean the whole friend group is showing up to this party 😭 Not me listing every single one, but like, I said I would, so:

📁 The Kernel file 📁

./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_color_test.c

That's where this whole situation lives, no cap.

👯 The color LUT & blob crew 👯

• dm_test_make_lut_blob(9)
• dm_test_verify_lut_sizes_null_luts(9)
• dm_test_verify_lut_sizes_valid_degamma(9)
• dm_test_verify_lut_sizes_invalid_degamma(9)
• dm_test_verify_lut_sizes_valid_gamma_atomic(9)
• dm_test_verify_lut_sizes_valid_gamma_legacy(9)
• dm_test_verify_lut_sizes_invalid_gamma(9)
• dm_test_verify_lut_sizes_both_valid(9)
• dm_test_verify_lut_sizes_invalid_degamma_valid_gamma(9)

🌈 The atomic LUT3D squad 🌈

• dm_test_atomic_lut3d_zero_size(9)
• dm_test_atomic_lut3d_nonzero_state_bits(9)
• dm_test_atomic_lut3d_data_forwarded(9)

⭐ The colorop 3dlut girlies ⭐

• dm_test_set_colorop_3dlut_zero_size(9)
• dm_test_set_colorop_3dlut_nonzero_state_bits(9)
• dm_test_set_colorop_3dlut_data_forwarded(9)

💖 Transfer function besties 💖

• dm_test_set_tf_bypass(9)
• dm_test_set_tf_distributed_points_srgb(9)
• dm_test_set_tf_distributed_points_pq(9)
• dm_test_set_output_tf_linear(9)
• dm_test_set_output_tf_32_srgb_rom(9)
• dm_test_set_input_tf_srgb(9)
• dm_test_set_input_tf_32_srgb(9)
• dm_test_set_transfer_funcs_with_luts(9)

🧚 The atomic regamma / shaper / blend icons 🧚

• dm_test_set_atomic_regamma_bypass(9)
• dm_test_set_atomic_regamma_srgb(9)
• dm_test_atomic_shaper_lut_bypass(9)
• dm_test_atomic_blend_lut_bypass(9)
• dm_test_atomic_shaper_blend_srgb(9)

🍓 The colorop 1D curve crew 🍓

• dm_test_set_colorop_in_tf_1d_curve_invalid_type(9)
• dm_test_set_colorop_in_tf_1d_curve_unsupported_curve(9)
• dm_test_set_colorop_in_tf_1d_curve_bypass(9)

💜 Color mod & LUT3D verification 💜

• dm_test_init_color_mod(9)
• dm_test_verify_lut3d_alloc_plane(9)
• dm_test_verify_lut3d_alloc_adev(9)
• dm_test_verify_lut3d_no_luts(9)
• dm_test_verify_lut3d_bad_shaper(9)
• dm_test_verify_lut3d_bad_lut3d(9)
• dm_test_verify_lut3d_valid(9)

👑 The colorop fixture + multiplier + matrix section 👑

• struct dm_test_colorop_fixture(9)
• dm_test_colorop_setup(9)
• dm_test_colorop_multiplier_applied(9)
• dm_test_colorop_multiplier_no_match(9)
• dm_test_colorop_3x4_matrix_applied(9)
• dm_test_colorop_3x4_matrix_bad_length(9)
• dm_test_colorop_degamma_predefined(9)
• dm_test_colorop_degamma_no_match(9)

💀 Color update fixture + CTM + the whole CRTC color mgmt saga 💀

• struct dm_test_color_update_fixture(9)
• dm_test_color_update_setup(9)
• dm_test_make_ctm_blob(9)
• dm_test_check_crtc_color_mgmt_no_luts(9)
• dm_test_check_crtc_color_mgmt_legacy_regamma(9)
• dm_test_check_crtc_color_mgmt_degamma(9)
• dm_test_update_crtc_color_mgmt_no_ctm(9)
• dm_test_update_crtc_color_mgmt_ctm(9)

🐛 The plane color mgmt extended universe 🐛

• dm_test_update_plane_color_mgmt_bad_lut3d(9)
• dm_test_update_plane_color_mgmt_fallback_defaults(9)
• dm_test_update_plane_color_mgmt_maps_crtc_degamma(9)
• dm_test_update_plane_color_mgmt_maps_crtc_degamma_lut(9)
• dm_test_update_plane_color_mgmt_maps_bt709_degamma(9)
• dm_test_update_plane_color_mgmt_plane_degamma_lut(9)
• dm_test_update_plane_color_mgmt_rejects_dual_degamma(9)
• dm_test_update_plane_color_mgmt_uses_color_caps(9)
• dm_test_update_plane_color_mgmt_legacy_luts(9)
• dm_test_update_plane_color_mgmt_plane_ctm(9)

🧚‍♀️ The colorop pipeline finale 🧚‍♀️

• dm_test_colorop_pipeline_add(9)
• dm_test_colorop_pipeline_setup(9)
• dm_test_update_plane_color_mgmt_colorop_bypass_pipeline(9)
• dm_test_update_plane_color_mgmt_colorop_missing_multiplier(9)
• dm_test_update_plane_color_mgmt_colorop_missing_3x4(9)
• dm_test_update_plane_color_mgmt_colorop_truncated(9)
• dm_test_update_plane_color_mgmt_colorop_no_3dlut_hw(9)
• dm_test_update_plane_color_mgmt_colorop_shaper(9)
• dm_test_update_plane_color_mgmt_colorop_3dlut(9)
• dm_test_update_plane_color_mgmt_colorop_3dlut_no_data(9)
• dm_test_update_plane_color_mgmt_colorop_blend(9)

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That's genuinely every single one of them, bestie. I counted. Multiple times. The way this test file has an entire extended family 😭💖

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🫶 The cute little sign-off 🫶

So this page comes from ./drivers/gpu/drm/amd/display/... and it's dated October 2026, belonging to the Kernel API Manual under dm_test_set_..._tf_identity(9) — that's the short-and-slashy name this very page goes by up top. Stay iconic, drink water, and may all your LUTs be the size you expected 🌈✨💅