dm_mst_test...esi_dpcd_esi(9)

🌸 dm_mst_test...esi_dpcd_esi(9) 🌸

okay so first things first: welcome to the dm_mst_test...esi_dpcd_esi(9) page, live from the Kernel API Manual ✨ pull up a chair, bestie, this one's a tiny little KUnit tester and it's honestly kind of cute.

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💖 NAME 💖

dm_mst_test_select_esi_dpcd_esi — literally the "1.2+ DPCD ESI address/length" test. that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

void dm_mst_test_select_esi_dpcd_esi (struct kunit *test );

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⭐ ARGUMENTS ⭐

• test — the KUnit test context, aka the little backpack this function carries around while it does its thing 🎒

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🔥 DESCRIPTION 🔥

so when DPCD rev is >= 0x12, this test checks that the ESI DP_SINK_COUNT_ESI address/length pair gets selected. that's it, that's the test. it verifies the pick, and it slays 💅 no cap, it's a very focused little function and honestly? we respect that.

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👑 SEE ALSO 👑

bestie, buckle up. the whole friend group is here 🌈 but first:

• Kernel file: ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_mst_types_test.c
• 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_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_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)

like I said. the whole group chat 😭💜

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ngl, if you're reading this page it's probably because you're deep in the AMD display MST tests and you already know the drill. hi, bestie, you're doing amazing 🫶

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and that's a wrap, mwah 💋 this page comes courtesy of ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so go forth, run your KUnit tests, and remember: >= 0x12 means new ESI address/length pair, periodt. 🍓🧚💅