dm_test_crtc...invalid_crtc(9)

💅 NAME 💅

dm_test_crtc_get_scanoutpos_invalid_crtc — bestie, it literally tests that an invalid CRTC returns -EINVAL

So this is one page in the Kernel API Manual (that's the manual name, hi, welcome) and it's a whole vibe check for one single KUnit test. The test passes in a bad CRTC and expects the kernel to go "nope, -EINVAL" — and honestly? Slay. Validation is self-care. 🎀

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✨ SYNOPSIS ✨

void dm_test_crtc_get_scanoutpos_invalid_crtc (struct kunit *test );

That's it. One function, one argument, zero drama (the good kind of zero drama). 🦋

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🌸 ARGUMENTS 🌸

• test — The KUnit test context. It's the little ✨situationship✨ object every KUnit test gets handed so it can report pass/fail and keep its own state. Give it the context, it does the test, everyone goes home happy. 💖

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👑 SEE ALSO 👑

📁 Kernel file

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

🧚 The whole test-suite friend group

Not me listing the ENTIRE extended family, but here we are, and every single one of them ate:

• 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_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_master_stream_defaults_to_first(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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Okay so that's the whole page, no cap. 🫶 Little sign-off for the record: this one lives under the source/version path ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so yeah, it's giving future icon, it's giving timeless kernel documentation, and it's giving dm_test_crtc...invalid_crtc(9) forever. 💜✨