dm_mst_test_...o_ready_bits(9)

✨ dm_mst_test_...o_ready_bits(9) ✨

okay so welcome to the kernel api manual bestie, this page is literally called dm_mst_test_...o_ready_bits(9) (yes the title got truncated by the man page and we're just living with it 💅) and it's about one single very specific little KUnit test. it's giving "one job, does it well". let's get into it 🎀

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🌸 NAME 🌸

dm_mst_test_sideband_msg_ready_no_ready_bits — Test idle sideband event

like. that's the whole vibe. it tests the idle sideband event. no notes 👑

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🦋 SYNOPSIS 🦋

void dm_mst_test_sideband_msg_ready_no_ready_bits (struct kunit *test );

no return value, it's a void function, it just goes in, does the test, and leaves. main character energy fr fr ✨

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💖 ARGUMENTS 💖

• test — the KUnit test context. this is the little test harness buddy that gets passed in so the test can actually do its KUnit things. it's the plus-one at the function party 🫶

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⭐ DESCRIPTION ⭐

okay so here's the actual tea ☕

this test verifies that dm_handle_mst_sideband_msg_ready_event returns cleanly when:

1. the ESI read succeeds ✅
2. but no DOWN_REP/UP_REQ ready bits are set 🚫

so like. the read worked, the data came back fine, but there's just nothing flagged as ready. and the function should still just... return cleanly. no drama, no crash, no chaos. it's the "everything is quiet and that's fine" scenario. and we're verifying it doesn't have a meltdown over it 😌

reminder bestie: this is describing what the test checks, not what the function does in general. don't go making assumptions beyond what's written here, iykyk 💀

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🧚 SEE ALSO 🧚

Kernel file

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

and literally the entire rest of the test family. like the whole squad. here they all are, no cap, every single one 🌈:

• 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_select_esi_dpcd_esi(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 squad. iconic behavior honestly 👑

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and that's the page!! tysm for reading my little man page rewrite, bestie 💜

sign-off time 🎀: this came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026, and the title on the tin is still dm_mst_test_...o_ready_bits(9) because some things never change 💅✨🌸