dm_test_hel...ewport_width(9)
β¨ dm_test_hel...ewport_width(9) β¨
okay so bestie, welcome to the Kernel API Manual π we're looking at dm_test_hel...ewport_width(9) today and honestly? it's a lil baddie with one very specific job. let's get into it π«Ά
πΈ NAME πΈ
dm_test_helper_check_state_small_viewport_width β verify width rejection. that's it. that's the whole vibe check π
π¦ SYNOPSIS π¦
void dm_test_helper_check_state_small_viewport_width (struct kunit *test
);
π ARGUMENTS π
testβ the KUnit test context. it's the lil group chat your test runs inside, fr fr π±
β DESCRIPTION β
so what does this actually do? it verifies whether a viewport width that dips below the minimum pipe-split width gets rejected π€ like, too small? no thanks, we're not doing that. the test checks that the rejection happens, periodt.
ngl, it's giving "boundary check main character energy" π
π₯ SEE ALSO π₯
okay this list is long long, but every single one of these deserves their flowers πΈ so here we go, no skips, no cap:
- Kernel file:
./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_plane_test.c dm_test_plane_is_video_format_known_video(9)dm_test_fill_blending_defaults(9)dm_test_fill_blending_premulti_alpha_format(9)dm_test_fill_blending_coverage_alpha_format(9)dm_test_fill_blending_global_alpha(9)dm_test_modifier_has_dcc(9)dm_test_modifier_gfx9_swizzle_mode(9)dm_test_get_plane_formats(9)dm_test_get_plane_modifiers(9)dm_test_fill_dc_scaling_info(9)dm_test_get_min_max_dc_plane_scaling(9)dm_test_get_cursor_position(9)dm_test_format_mod_supported(9)dm_test_fill_gfx12_plane_attributes_from_modifiers(9)dm_test_fill_gfx9_plane_attributes_from_modifiers(9)dm_test_helper_check_state_viewport_reject(9)dm_test_validate_dcc_disabled_returns_success(9)dm_test_validate_dcc_video_non_gfx12_fails(9)dm_test_validate_dcc_missing_cap_func_fails(9)dm_test_validate_dcc_cap_callback_fails(9)dm_test_validate_dcc_not_capable_fails(9)dm_test_validate_dcc_success_and_scan_mapping(9)dm_test_validate_dcc_independent_64b_mismatch_fails(9)dm_test_add_modifier_appends_value(9)dm_test_add_modifier_grows_capacity(9)dm_test_add_modifier_noop_when_mods_null(9)dm_test_fill_gfx9_tiling_info_from_device_pre_10_3(9)dm_test_fill_gfx9_tiling_info_from_device_10_3_plus(9)dm_test_fill_gfx9_tiling_info_from_modifier_linear(9)dm_test_fill_gfx9_tiling_info_from_modifier_pre_nv(9)dm_test_fill_gfx9_tiling_info_from_modifier_nv(9)dm_test_get_format_info(9)dm_test_fill_blending_global_alpha_dcn42(9)dm_test_get_plane_formats_overlay_universal_cap(9)dm_test_get_plane_modifiers_gfx9(9)dm_test_get_plane_modifiers_rv(9)dm_test_get_plane_modifiers_rv_constant_encode(9)dm_test_get_plane_modifiers_gfx10_1(9)dm_test_get_plane_modifiers_gfx10_3(9)dm_test_get_plane_modifiers_gfx11_64k_first(9)dm_test_get_plane_modifiers_gfx11_256k_first(9)dm_test_get_plane_modifiers_gfx12(9)dm_test_fill_gfx9_plane_attributes_dcc(9)dm_test_fill_gfx9_plane_attributes_validate_fails(9)dm_test_fill_gfx9_plane_attributes_dcc_rbplus_64b_no_128bcl(9)dm_test_fill_gfx9_plane_attributes_dcc_rbplus_128b(9)dm_test_fill_gfx9_plane_attributes_dcc_rbplus_unconstrained(9)dm_test_fill_gfx9_plane_attributes_dcc_gfx9_64b(9)dm_test_fill_gfx9_plane_attributes_dcc_gfx9_unconstrained(9)dm_test_fill_gfx12_plane_attributes_block0(9)dm_test_fill_gfx12_plane_attributes_block_unconstrained(9)dm_test_fill_gfx12_plane_attributes_validate_fails(9)dm_test_fill_plane_buffer_attributes_video(9)dm_test_fill_plane_buffer_attributes_gfx12(9)dm_test_get_min_max_dc_plane_scaling_fp16(9)dm_test_helper_check_state_small_viewport_height(9)dm_test_helper_check_state_bottom_clipped_height(9)dm_test_helper_check_state_scaling_caps(9)dm_test_fill_dc_scaling_info_nv12_dcn1x(9)dm_test_fill_dc_scaling_info_plane_caps(9)dm_test_get_cursor_position_bad_size(9)dm_test_format_mod_supported_d_swizzle_reject(9)dm_test_atomic_async_check_rejects(9)dm_test_atomic_async_check_overlay_cursor(9)dm_test_atomic_check_no_dc_state(9)dm_test_atomic_check_missing_crtc_state(9)dm_test_atomic_check_helper_failure(9)dm_test_atomic_check_color_pipeline_conflict(9)dm_test_atomic_check_scaling_failure(9)dm_test_panic_flush_no_dc_state(9)dm_test_plane_reset_initializes_state(9)dm_test_plane_duplicate_state_copies_fields(9)dm_test_plane_destroy_state_minimal(9)
like I said β everyone got an invite to this party π and yes, we listed all of them. you're welcome π
π real talk though: this page is a (9) kernel API entry, so it's for people writing/testing kernel code (specifically the amdgpu display plane tests). not exactly casual reading, but you're built different, you got this πͺ
and that's the whole page bestie, we ate and left no crumbs π
sign-off time π«Ά this one's from the kernel API manual, source/version ./drivers/gpu/drm/amd/display/..., dated October 2026. iconic. no notes. πβ¨π
π¦ where this page comes from
- nixpkgs unstable: linux-manual 7.3.1
- π girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on : a language model's rewrite of the original, under its terms