dm_mst_test...ch_reads_oui(9)

💅 dm_mst_test_retrieve_branch_reads_oui — like, the manual page bestie

okay so this is a page from the Kernel API Manual, section 9 (kernel dev girlies know ✨). Sit down, grab a strawberry drink 🍓, and let's get into it.

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🌸 NAME 🌸

dm_mst_test_retrieve_branch_reads_oui — bestie, this is the Test branch OUI parsing one. That's literally its whole job description. No cap.

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✨ SYNOPSIS ✨

void dm_mst_test_retrieve_branch_reads_oui (struct kunit *test );

That's it. One function, void return, one arg. Iconic minimalism honestly 🎀

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🦋 ARGUMENTS 🦋

• test — the KUnit test context 💖 this is the little vibe-holder that KUnit hands you so the test framework knows what's up. Gimme the context, I'll do the rest.

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👑 DESCRIPTION 👑

Not me reading this and being obsessed 😭 The tea is: this function verifies that retrieve_branch_specific_data does two things —

• it reads the immediate upstream branch descriptor, and
• it caches its IEEE OUI value on the connector.

So like, the branch descriptor comes in, the OUI gets remembered on the connector. That's the whole check. Slay, honestly. 🔥 This is a test, so it's just confirming the behaviour is behaving. Periodt.

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💜 SEE ALSO 💜

First up, the Kernel file — the actual source, in all its glory:

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

Then the whole friend group 🫶 — literally the entire test roster, go say hi to all of them:

• dm_mst_test_needs_dsc_aux_workaround_match(9)
• dm_mst_test_needs_dsc_aux_workaround_rev12(9)
• dm_mst_test_needs_dsc_aux_workaround_wrong_dev_id(9)
• dm_mst_test_needs_dsc_aux_workaround_wrong_rev(9)
• dm_mst_test_needs_dsc_aux_workaround_low_sink_count(9)
• dm_mst_test_needs_dsc_aux_workaround_zero_sink_count(9)
• dm_mst_test_pbn_divider_null_link(9)
• dm_mst_test_pbn_divider_uses_link_bandwidth(9)
• dm_mst_test_reset_connector_setting(9)
• dm_mst_test_retrieve_downstream_no_aux(9)
• dm_mst_test_retrieve_downstream_present(9)
• dm_mst_test_retrieve_downstream_aux_error(9)
• dm_mst_test_retrieve_branch_no_parent(9)
• dm_mst_test_aux_result_success(9)
• dm_mst_test_aux_result_eio(9)
• dm_mst_test_aux_result_ebusy(9)
• dm_mst_test_aux_result_timeout(9)
• dm_mst_test_aux_transfer_native_read(9)
• dm_mst_test_aux_transfer_native_write(9)
• dm_mst_test_aux_transfer_partial_write(9)
• dm_mst_test_aux_transfer_error_result(9)
• dm_mst_test_aux_transfer_hpd_discon_quirk(9)
• dm_mst_test_aux_transfer_non_ack_reply(9)
• dm_mst_test_fill_payload_flags_native_write(9)
• dm_mst_test_fill_payload_flags_native_read(9)
• dm_mst_test_fill_payload_flags_i2c_read_mot(9)
• dm_mst_test_fill_payload_flags_write_status(9)
• dm_mst_test_msg_ready_mask(9)
• dm_mst_test_select_esi_dpcd_legacy(9)
• dm_mst_test_select_esi_dpcd_esi(9)
• dm_mst_test_sideband_msg_ready_no_ready_bits(9)
• dm_mst_test_sideband_msg_ready_read_error(9)
• dm_mst_test_sideband_msg_ready_without_mst_state(9)
• dm_mst_test_down_rep_msg_ready_wrapper(9)
• dm_mst_test_initialize_dp_connector_edp(9)
• dm_mst_test_initialize_dp_connector_mst(9)
• dm_mst_test_atomic_best_encoder(9)
• dm_mst_test_create_fake_mst_encoders(9)
• dm_mst_test_atomic_check_no_old_crtc(9)
• dm_mst_test_detect_unregistered(9)
• dm_mst_test_fp_guarded_public_stubs(9)

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ok that's the whole page bestie, no lore left behind 💀 every flag, every path, every single test name — all accounted for. iykyk 🧚

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byeee 💖 this lil page lives over at ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — mark your calendars, she's from the future ⭐🌈🫶