dm_test_dmu...max_ddc_line(9)

✨ dm_test_dmu...max_ddc_line(9) ✨

ok so this is a page from the Kernel API Manual (yes, the kernel has lore too, and it's living in 9 land 💅). bestie, we're looking at a KUnit test function for the DMUB, and honestly it's giving "one tiny piece of a very big puzzle" energy.

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💖 NAME 💖

dm_test_dmub_aux_fused_io_callback_max_ddc_line — literally a test for the Dmub aux fused io callback max ddc line. that's the whole vibe. it tests the max DDC line case for the DMUB aux fused I/O callback, no cap 🦋

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🎀 SYNOPSIS 🎀

void dm_test_dmub_aux_fused_io_callback_max_ddc_line (struct kunit *test
);

it takes exactly one thing and returns nothing (void — iconic, no notes 🫶).

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🌸 ARGUMENTS 🌸

• test — the KUnit test context. that's it. that's the whole argument list. it's the little container that carries the test's state so the test can do its thing ✨

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⭐ SEE ALSO ⭐

ok this section is long, so buckle up — these are all the sibling tests and related bits hanging out in the same corner of the kernel, and every single one of them is a (9) manpage bestie:

• Kernel file — the actual source lives in:

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

go say hi to it 💜

and now the full squad, in order, no skips:

• 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_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_dcn31(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… the whole friend group showed up to the function 💀🫶

heads up: that list is exactly as written in the original — same names, same (9), same order. i'm not about to lose a single one, periodt.

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🌈 cute sign-off 🌈

this lil' page came from the Kernel API Manual, out of that source location that the footer shortens down to ./drivers/gpu/drm/amd/display/... (the full path is up in SEE ALSO, don't worry bestie 💖), and it's stamped October 2026. yeah. 2026. we're so ahead. 🧚⭐

that's the whole page — short, sweet, extremely niche, and living its best life in section 9 💅👑