dm_test_adj...nvalid_depth(9)

👑 NAME 👑

okay bestie, welcome to the Kernel API Manual — yes this is a (9) kernel API page and yes you're gonna read it. This one is dm_test_adjust_colour_depth_invalid_depth — affectionately known around the group chat as Test Adjust colour depth invalid depth. That's the whole job. It's a KUnit test, it does exactly one (1) thing, and it's iconic for it. 💅

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✨ SYNOPSIS ✨

void dm_test_adjust_colour_depth_invalid_depth (struct kunit *test );

like… that's it. that's the whole function signature. she's short, she's sweet, she's void. 🎀

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🌸 ARGUMENTS 🌸

• test — the KUnit test context, no cap. that's the whole parameter list. hand her the test context and let her cook.

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🦋 SEE ALSO 🦋

okay so this is the part where I need you to stay with me, because there are a lot of siblings in this family and I'm listing every single one, fr fr. no skipping. 🫶

The kernel file this lives in is:

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

subconnector type besties

• dm_test_subconnector_type_none(9), dm_test_subconnector_type_vga(9), dm_test_subconnector_type_dvi_converter(9), dm_test_subconnector_type_dvi_dongle(9), dm_test_subconnector_type_hdmi_converter(9), dm_test_subconnector_type_hdmi_dongle(9), dm_test_subconnector_type_mismatched(9), dm_test_subconnector_type_default_unknown(9)

content type girlies

• dm_test_content_type_no_data(9), dm_test_content_type_graphics(9), dm_test_content_type_photo(9), dm_test_content_type_cinema(9), dm_test_content_type_game(9), dm_test_content_type_unknown_defaults_no_data(9)

the colour depth adjusters (our main character's direct fam 💖)

• dm_test_adjust_colour_depth_fits_at_888(9), dm_test_adjust_colour_depth_reduces_to_888(9), dm_test_adjust_colour_depth_10bpc_passes(9), dm_test_adjust_colour_depth_420_halves_clk(9), dm_test_adjust_colour_depth_420_reduces(9), dm_test_adjust_colour_depth_reduces_12bpc_to_10bpc(9), dm_test_adjust_colour_depth_16bpc_no_fallback(9), dm_test_adjust_colour_depth_none_fits(9)

output colour space squad 🌈

• dm_test_output_color_space_default_rgb_full(9), dm_test_output_color_space_default_rgb_limited(9), dm_test_output_color_space_default_ycbcr709(9), dm_test_output_color_space_default_ycbcr601_limited(9), dm_test_output_color_space_bt601_y_only(9), dm_test_output_color_space_bt601(9), dm_test_output_color_space_bt709(9), dm_test_output_color_space_bt709_y_only(9), dm_test_output_color_space_oprgb(9), dm_test_output_color_space_bt2020_rgb(9), dm_test_output_color_space_bt2020_rgb_limited(9), dm_test_output_color_space_default_rgb_auto_hdmi_cta(9), dm_test_output_color_space_default_rgb_auto_hdmi_vga(9), dm_test_output_color_space_default_rgb_auto_dp_cta(9), dm_test_output_color_space_default_rgb_full_hdmi_cta(9), dm_test_output_color_space_bt2020_rgb_auto_hdmi_cta(9), dm_test_output_color_space_bt2020_ycc(9), dm_test_output_color_space_default_ycbcr709_y_only(9), dm_test_output_color_space_default_ycbcr601(9), dm_test_output_color_space_bt2020_ycc_rgb_encoding(9), dm_test_output_color_space_bt2020_ycc_rgb_encoding_limited(9), dm_test_output_color_space_bt2020_rgb_ycc_encoding(9)

colour depth conversion + from_info crew

• dm_test_convert_color_depth_bpc_mappings(9), dm_test_convert_color_depth_bpc_unknown(9), dm_test_color_depth_from_info_bpc8(9), dm_test_color_depth_from_info_bpc10(9), dm_test_color_depth_from_info_zero_bpc_defaults_888(9), dm_test_color_depth_from_info_requested_bpc_caps(9), dm_test_color_depth_from_info_y420_default(9), dm_test_color_depth_from_info_y420_10bpc(9), dm_test_color_depth_from_info_y420_12bpc(9), dm_test_color_depth_from_info_y420_16bpc(9), dm_test_color_depth_from_info_requested_odd_bpc(9), dm_test_color_depth_from_info_unsupported_bpc(9)

to_connector_type besties

• dm_test_to_connector_type_hdmi(9), dm_test_to_connector_type_edp(9), dm_test_to_connector_type_lvds(9), dm_test_to_connector_type_rgb(9), dm_test_to_connector_type_dp(9), dm_test_to_connector_type_dp_mst(9), dm_test_to_connector_type_dvi_dvii(9), dm_test_to_connector_type_dual_link_dvii(9), dm_test_to_connector_type_dvi_dvid(9), dm_test_to_connector_type_dual_link_dvid(9), dm_test_to_connector_type_virtual(9), dm_test_to_connector_type_unknown(9)

duplicate mode detectors 🔍

• dm_test_is_duplicate_mode_empty_list(9), dm_test_is_duplicate_mode_match(9), dm_test_is_duplicate_mode_no_match(9), dm_test_is_duplicate_mode_same_size_different_clock(9)

encoder crtc masks (one thru six, plus the default, slay)

• dm_test_encoder_crtc_mask_1(9), dm_test_encoder_crtc_mask_2(9), dm_test_encoder_crtc_mask_3(9), dm_test_encoder_crtc_mask_4(9), dm_test_encoder_crtc_mask_5(9), dm_test_encoder_crtc_mask_6(9), dm_test_encoder_crtc_mask_default(9)

aspect ratio gang

• dm_test_aspect_ratio_no_data(9), dm_test_aspect_ratio_4_3(9), dm_test_aspect_ratio_16_9(9), dm_test_aspect_ratio_64_27(9), dm_test_aspect_ratio_256_135(9)

crtc timing decisions

• dm_test_copy_crtc_timing_copies_all_fields(9), dm_test_copy_crtc_timing_leaves_non_crtc_fields(9), dm_test_decide_crtc_timing_scale_enabled(9), dm_test_decide_crtc_timing_matching_mode(9), dm_test_decide_crtc_timing_no_copy(9), dm_test_decide_crtc_timing_no_crtc_clock(9)

funcs / atomic / hdr

• dm_test_funcs_reset_sets_defaults(9), dm_test_funcs_reset_edp_abm_level(9), dm_test_funcs_reset_edp_abm_disabled(9), dm_test_atomic_dup_state_copies_fields(9), dm_test_fill_hdr_null_metadata(9), dm_test_fill_hdr_zeroes_output(9)

set_property girlies

• dm_test_set_property_scaling_center(9), dm_test_set_property_scaling_aspect(9), dm_test_set_property_scaling_fullscreen(9), dm_test_set_property_scaling_none(9), dm_test_set_property_scaling_unchanged(9), dm_test_set_property_underscan_hborder(9), dm_test_set_property_underscan_vborder(9), dm_test_set_property_underscan_enable(9), dm_test_set_property_abm_sysfs_control(9), dm_test_set_property_abm_level_off(9), dm_test_set_property_abm_level_value(9), dm_test_set_property_unknown(9)

get_property girlies

• dm_test_get_property_scaling_center(9), dm_test_get_property_scaling_aspect(9), dm_test_get_property_scaling_full(9), dm_test_get_property_scaling_off(9), dm_test_get_property_underscan_borders(9), dm_test_get_property_abm_sysfs_allowed(9), dm_test_get_property_abm_level(9), dm_test_get_property_abm_disabled_zero(9), dm_test_get_property_unknown(9)

refresh + freesync video mode

• dm_test_highest_refresh_writeback_null(9), dm_test_highest_refresh_cached_base(9), dm_test_highest_refresh_preferred_mode(9), dm_test_is_freesync_video_mode_null_mode(9), dm_test_is_freesync_video_mode_match(9), dm_test_is_freesync_video_mode_no_match(9)

cacp caps (there are… so many) 😭

• dm_test_cacp_caps_unsupported_ip(9), dm_test_cacp_caps_excluded_ip_316(9), dm_test_cacp_caps_edp_oled_supported(9), dm_test_cacp_caps_lvds_oled_supported(9), dm_test_cacp_caps_non_edp_signal(9), dm_test_cacp_caps_lcd_panel(9), dm_test_cacp_caps_edp_supported(9), dm_test_cacp_caps_lvds_supported(9), dm_test_cacp_caps_old_ip_unsupported(9), dm_test_cacp_caps_ip_3_1_6_unsupported(9), dm_test_cacp_caps_non_edp_lvds_unsupported(9), dm_test_cacp_caps_lcd_unsupported(9)

panel type detectives 🕵️

• dm_test_set_panel_type_vsdb_oled(9), dm_test_set_panel_type_vsdb_miniled(9), dm_test_set_panel_type_dpcd_oled(9), dm_test_set_panel_type_dpcd_miniled(9), dm_test_set_panel_type_did_oled(9), dm_test_set_panel_type_did_lcd(9), dm_test_set_panel_type_vendor_lum_heuristic(9), dm_test_set_panel_type_defaults_to_lcd(9), dm_test_set_panel_type_samsung_miniled(9), dm_test_set_panel_type_samsung_below_threshold(9), dm_test_set_panel_type_default_lcd(9)

update subconnector

• dm_test_update_subconnector_dp_with_sink(9), dm_test_update_subconnector_dp_no_sink(9), dm_test_update_subconnector_non_dp_noop(9)

fbc init

• dm_test_fbc_init_no_compressor(9), dm_test_fbc_init_non_edp(9), dm_test_fbc_init_already_allocated(9), dm_test_fbc_init_no_modes(9)

detect mst

• dm_test_detect_mst_no_connectors(9), dm_test_detect_mst_skips_writeback(9), dm_test_detect_mst_non_mst_link(9), dm_test_detect_mst_branch_without_aux(9)

find first crtc

• dm_test_find_first_crtc_match(9), dm_test_find_first_crtc_no_match(9), dm_test_find_first_crtc_empty_state(9), dm_test_find_first_crtc_skips_null_ptr(9), dm_test_find_first_crtc_returns_first(9)

fill_stream (a whole saga)

• dm_test_fill_stream_borders_zeroed(9), dm_test_fill_stream_rgb_defaults(9), dm_test_fill_stream_sync_polarity_positive(9), dm_test_fill_stream_sync_polarity_negative(9), dm_test_fill_stream_inherits_old_stream(9), dm_test_fill_stream_timing_from_crtc(9), dm_test_fill_stream_color_depth_requested_bpc(9), dm_test_fill_stream_content_type(9), dm_test_fill_stream_aspect_ratio(9), dm_test_fill_stream_encoding_from_caller_ycbcr420(9), dm_test_fill_stream_encoding_from_caller_ycbcr422(9), dm_test_fill_stream_encoding_from_caller_ycbcr444(9), dm_test_fill_stream_hdmi_ep_clamps_depth(9), dm_test_fill_stream_non_hdmi_ep_keeps_depth(9)

create stream

• dm_test_create_stream_fake_sink_success(9), dm_test_create_stream_sets_dm_context(9), dm_test_create_stream_virtual_signal(9), dm_test_create_stream_scaling_src(9), dm_test_create_stream_existing_sink(9)

detect + dac load

• dm_test_detect_force_on(9), dm_test_detect_force_on_digital(9), dm_test_detect_force_off(9), dm_test_detect_sink_present(9), dm_test_detect_no_sink(9), dm_test_poll_dac_load_returns_cached(9)

register / unregister / destroy

• dm_test_late_register_non_dp_succeeds(9), dm_test_unregister_non_dp_noop(9), dm_test_destroy_minimal(9), dm_test_destroy_releases_dc_sink(9), dm_test_destroy_releases_dc_em_sink(9), dm_test_encoder_disable_noop(9)

atomic check

• dm_test_atomic_check_edp_native_keeps_scaling(9), dm_test_atomic_check_lvds_non_native_enables_scaling(9), dm_test_atomic_check_non_mst_returns_zero(9)

hdmi cec + edid mgmt

• dm_test_hdmi_cec_unset_edid_no_notifier(9), dm_test_create_eml_sink_no_edid(9), dm_test_handle_edid_mgmt_dp_sets_link_caps(9), dm_test_handle_edid_mgmt_non_dp_leaves_caps(9), dm_test_funcs_force_no_edid(9), dm_test_hdmi_cec_set_edid_no_notifier(9)

validate stream / to encoder / native mode

• dm_test_validate_stream_null_stream(9), dm_test_to_encoder_no_encoder(9), dm_test_to_encoder_returns_attached(9), dm_test_native_mode_no_encoder(9), dm_test_native_mode_empty_probed_zeroes_clock(9), dm_test_native_mode_copies_preferred(9)

common modes + freesync modes

• dm_test_create_common_mode_overrides(9), dm_test_add_common_modes_non_edp_noop(9), dm_test_add_common_modes_edp_adds(9), dm_test_ddc_get_modes_null_edid(9), dm_test_add_fs_modes_no_preferred_mode(9), dm_test_add_freesync_modes_null_edid_noop(9)

i2c

• dm_test_i2c_func_returns_flags(9), dm_test_i2c_xfer_no_ddc_pin(9)

amd vsdb + displayid vrr

• dm_test_get_amd_vsdb_unsupported(9), dm_test_get_amd_vsdb_supported(9), dm_test_parse_hdmi_amd_vsdb_null_edid(9), dm_test_parse_hdmi_amd_vsdb_no_extensions(9), dm_test_parse_hdmi_amd_vsdb_no_cea_ext(9), dm_test_parse_displayid_vrr_null_edid(9), dm_test_parse_displayid_vrr_no_displayid(9), dm_test_parse_displayid_vrr_sets_range(9)

mode valid

• dm_test_mode_valid_interlace_rejected(9), dm_test_mode_valid_dblscan_rejected(9)

s3 hdmi cec

• dm_test_s3_handle_hdmi_cec_suspend(9), dm_test_s3_handle_hdmi_cec_resume(9)

create/validate stream + update after detect

• dm_test_create_validate_stream_null_dm_state(9), dm_test_update_after_detect_mst_noop(9), dm_test_update_after_detect_sink_unchanged(9)

update scaling (the final boss ✨)

• dm_test_update_scaling_null_mode(9), dm_test_update_scaling_fullscreen_default(9), dm_test_update_scaling_rmx_full(9), dm_test_update_scaling_rmx_aspect_pillarbox(9), dm_test_update_scaling_rmx_aspect_letterbox(9), dm_test_update_scaling_rmx_center(9), dm_test_update_scaling_underscan(9)

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ngl bestie, if you made it through that entire SEE ALSO list you deserve a little treat. 🍓 like genuinely, that's 238 tests and you read all of them. main character energy, no cap.

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and that's the whole page! 💜 source/version is ./drivers/gpu/drm/amd/display/..., dated October 2026, and the page itself is dm_test_adj...nvalid_depth(9) — okay bye, go run your KUnit tests, ily 🫶✨