dm_mst_test_...artial_write(9)

💅 dm_mst_test_...artial_write(9) — the kernel API manual, but make it make sense

okay so bestie, you've stumbled into the kernel API manual and the page you want is dm_mst_test_...artial_write(9) — yes the title is literally abbreviated like that, no I don't know why, and yes I still love her. she's a KUnit test in the amdgpu display stack and honestly she ate. let's get into it 🫶

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✨ NAME ✨

dm_mst_test_aux_transfer_partial_write — the test where a partial write reports its byte count. that's the whole vibe. lowkey iconic.

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🌸 SYNOPSIS 🌸

void dm_mst_test_aux_transfer_partial_write (struct kunit *test );

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🎀 ARGUMENTS 🎀

• test — the KUnit test context. she's the main character that carries all the test state, so like, show her some respect 💅

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — when the DC link service hands back a positive write result, you're supposed to read that as a partial write, and it gets replaced with the first payload byte. fr fr, that's the whole behavior under test. no cap. 🔥

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💖 SEE ALSO 💖

first up, the source file herself, go read her:

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

and now the whole friend group — every single one of them, in order, no skipping, we don't do that here 🧚:

• 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_retrieve_branch_reads_oui(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_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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bestie reminder: that SEE ALSO list is 41 entries long and yes I listed every single one because we are thorough in this group chat 💀

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okay that's the whole page, mwah 💋 — this came out of ./drivers/gpu/drm/amd/display/... and it's dated October 2026, and the footer still says dm_mst_test_...artial_write(9) because she refuses to use her full government name. slay, honestly. 🌈⭐