dm_test_dmub...checks_dcn31(9)

💅 dm_test_dmub...checks_dcn31(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual, we're looking at dm_test_dmub...checks_dcn31(9) and honestly? she's a whole vibe. buckle up 🎀

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✨ NAME ✨

dm_test_dmub_hw_init_sanity_checks_dcn31 — the test that checks hw init actually turns on the DCN31 sanity checks. literally her whole purpose 💖

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🌸 SYNOPSIS 🌸

void dm_test_dmub_hw_init_sanity_checks_dcn31 (struct kunit *test );

like… that's it. that's the whole signature. clean, minimal, iconic 🦋

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🎀 ARGUMENTS 🎀

• test — the KUnit test context. this is the lil container the test framework hands you, and yes you need it, no you can't skip it 🫶

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💫 DESCRIPTION 💫

okay so picture this: you're on DCN3.1.2 and the DMCUB firmware version is sitting in the affected range. what should happen? dm_dmub_hw_init should enable the DC sanity-check debug flag. that's the whole thing. that's what this test is verifying, no cap 🔥

like, the test exists specifically to make sure that flag gets flipped on in that exact situation. if it doesn't? that's a fail, bestie 😭

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👑 SEE ALSO 👑

the Kernel file:

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

and the whole friend group (aka the rest of the crew, all (9)):

• dm_test_register_dmub_notify_callback_null_callback(9)
• dm_test_register_dmub_notify_callback_type_out_of_range(9)
• dm_test_register_dmub_notify_callback_valid(9)
• dm_test_register_dmub_notify_callback_offload_false(9)
• dm_test_dmub_aux_setconfig_callback_copies_and_completes(9)
• dm_test_dmub_aux_setconfig_callback_non_aux_no_complete(9)
• dm_test_dmub_aux_setconfig_callback_aux_with_null_dm_notify(9)
• dm_test_dmub_aux_setconfig_callback_set_config_reply(9)
• dm_test_dmub_aux_fused_io_callback_copies_reply_and_completes(9)
• dm_test_dmub_aux_fused_io_callback_max_ddc_line(9)
• dm_test_dmub_aux_fused_io_callback_null_args(9)
• dm_test_get_default_ips_mode_dcn35(9)
• dm_test_get_default_ips_mode_dcn351(9)
• dm_test_get_default_ips_mode_dcn36(9)
• dm_test_get_default_ips_mode_older_than_dcn35(9)
• dm_test_get_default_ips_mode_newer_default(9)
• dm_test_dmub_hw_init_no_dmub_srv(9)
• dm_test_dmub_hw_init_no_fb_info(9)
• dm_test_dmub_hw_init_no_firmware(9)
• dm_test_dmub_hw_init_success_fake_dmub(9)
• dm_test_dmub_hw_init_no_hw_support(9)
• dm_test_dmub_hw_init_bss_data(9)
• dm_test_dmub_hw_init_hw_init_fails(9)
• dm_test_dmub_hw_init_auto_load_timeout(9)
• dm_test_dmub_hw_init_apu_dpia_dcn35(9)
• dm_test_dmub_hw_init_sanity_checks_dcn314(9)
• dm_test_dmub_hw_init_dmcu_abm(9)
• dm_test_dmub_hw_resume_no_dmub_srv(9)
• dm_test_dmub_hw_resume_initialized_dmub(9)
• dm_test_dmub_hw_resume_full_init(9)
• dm_test_dmub_hw_resume_init_check_failed(9)
• dm_test_dmub_hw_resume_auto_load_timeout(9)
• dm_test_dmub_sw_init_unsupported_asic(9)
• dm_test_init_microcode_unsupported_asic(9)
• dm_test_dmub_get_vbios_bounding_box_default_null(9)
• dm_test_execute_dmub_cmd_null_dmub_srv(9)
• dm_test_process_dmub_aux_transfer_sync_engine_acquire(9)
• dm_test_process_dmub_aux_transfer_sync_protocol_error(9)
• dm_test_process_dmub_aux_transfer_sync_copies_data(9)
• dm_test_process_dmub_aux_transfer_sync_zero_length(9)
• dm_test_process_dmub_set_config_sync_unknown_error(9)
• dm_test_abort_fused_io_no_dmub_srv(9)

like, she has so many siblings and they're all equally valid, we love a big family 💜

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🧚 sign-off 🧚

that's the page, bestie! footer deets for the record: source/version is ./drivers/gpu/drm/amd/display/... and the date is October 2026, all wrapped up under dm_test_dmub...checks_dcn31(9). periodt 💅✨

go forth and sanity-check those flags 🌈