dm_test_mas...lts_to_first(9)

💫 dm_test_mas...lts_to_first(9) — Kernel API Manual 💫

okay bestie, welcome to the Kernel API Manual ✨ this one's a KUnit test in the AMD display driver tree and it's lowkey adorable, no cap 🎀

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💖 NAME 💖

dm_test_master_stream_defaults_to_first — the test that checks the default master when literally nothing got triggered 🫶

like, when none of your streams have the reset trigger on, this test just vibes and confirms the fallback behaviour is correct 💅

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✨ SYNOPSIS ✨

void dm_test_master_stream_defaults_to_first (struct kunit *test );

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🌸 ARGUMENTS 🌸

• test — the KUnit test context 💖 that's the whole parameter, that's the whole story, she's simple, she's iconic

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🦋 DESCRIPTION 🦋

okay so here's the vibe check 👑: when no stream has the reset trigger enabled, master_stream stays 0 and all streams point at the first stream as their event source ✨

that's it, that's the behaviour, and this test is literally just here to make sure it stays that way, periodt 💯

ngl it's giving "quietly load-bearing" — small test, big main character energy 🌈

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🔥 SEE ALSO 🔥

🎀 Kernel file

• ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c

💜 the rest of the squad (iykyk)

• dm_test_is_idle(9), dm_test_wait_for_idle(9), dm_test_soft_reset(9)
• dm_test_set_clockgating_state(9), dm_test_set_powergating_state(9)
• dm_test_bandwidth_update(9)
• dm_test_crtc_complete_writeback_no_connector(9)
• dm_test_crtc_complete_writeback_not_pending(9)
• dm_test_vblank_get_counter_out_of_range(9)
• dm_test_vblank_get_counter_no_stream(9)
• dm_test_crtc_get_scanoutpos_invalid_crtc(9)
• dm_test_crtc_get_scanoutpos_no_stream(9)
• dm_test_atomic_get_new_state_empty(9)
• dm_test_atomic_get_new_state_match(9)
• dm_test_atomic_destroy_state_no_context(9)
• dm_test_plane_layer_index_cmp_equal(9)
• dm_test_plane_layer_index_cmp_descending(9)
• dm_test_plane_layer_index_cmp_ascending(9)
• dm_test_fill_color_attr_rgb_format(9)
• dm_test_fill_color_attr_bt601_full(9)
• dm_test_fill_color_attr_bt601_limited(9)
• dm_test_fill_color_attr_bt709_full(9)
• dm_test_fill_color_attr_bt709_limited(9)
• dm_test_fill_color_attr_bt2020_full(9)
• dm_test_fill_color_attr_bt2020_limited(9)
• dm_test_fill_color_attr_invalid_encoding(9)
• dm_test_modereset_required_when_inactive_and_modeset(9)
• dm_test_modereset_not_required_when_active_and_modeset(9)
• dm_test_modereset_not_required_when_inactive_without_modeset(9)
• dm_test_scaling_state_same(9), dm_test_scaling_state_scaling_changed(9)
• dm_test_scaling_state_underscan_enabled(9)
• dm_test_scaling_state_underscan_disabled(9)
• dm_test_scaling_state_underscan_border_changed(9)
• dm_test_multisync_trigger_disabled(9)
• dm_test_multisync_trigger_rising(9)
• dm_test_multisync_trigger_falling(9)
• dm_test_master_stream_highest_refresh(9)
• dm_test_cp_diff_hdcp_type_change(9)
• dm_test_cp_diff_reenable_mode_changed(9)
• dm_test_cp_diff_reenable_no_change(9), dm_test_cp_diff_undesired(9)
• dm_test_cp_diff_desired_mode_changed(9)
• dm_test_cp_diff_desired_no_change(9)
• dm_test_cp_diff_update_hdcp_hotplug(9)
• dm_test_cp_diff_stream_reenabled(9)
• dm_test_cp_diff_s3_undesired_to_enabled(9)
• dm_test_cp_diff_desired_to_enabled(9)
• dm_test_cp_diff_desired_to_undesired(9)
• dm_test_per_frame_master_sync_single_stream(9)
• dm_test_per_frame_master_sync_two_streams(9)
• dm_test_per_frame_master_sync_skips_null_stream(9)
• dm_test_apply_delay_null_sink(9), dm_test_apply_delay_zero_wait(9)
• dm_test_apply_delay_nonzero_wait(9)

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and that's the whole page, bestie 🫶 go forth and test your defaults 💅✨

⭐ source path ./drivers/gpu/drm/amd/display/..., dated October 2026, filed under dm_test_mas...lts_to_first(9) — mwah, slay, bye 💖 ⭐