dm_mst_test...nk_bandwidth(9)

💅 dm_mst_test_pbn_divider_uses_link_bandwidth — from the Kernel API Manual 🎀

okay so bestie, buckle up, we're reading a kernel test doc together and honestly? it's a short one, we love that for us ✨

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🌸 NAME 🌸

dm_mst_test_pbn_divider_uses_link_bandwidth — literally a test that checks pbn_divider behaves when there's a link cap in play 💖

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🦋 SYNOPSIS 🦋

void dm_mst_test_pbn_divider_uses_link_bandwidth (struct kunit *test );

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🎀 ARGUMENTS 🎀

• test — the KUnit test context, aka the little bag of test state that gets handed to you 🫶

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⭐ DESCRIPTION ⭐

So here's the vibe check: this test verifies that dm_mst_get_pbn_divider uses the DC link service to derive the fixed-point PBN divider — but only when a link is actually present. no link, no link-service derivation, that's the whole point 🔥

that's it. that's the description. short and iconic 👑

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💜 SEE ALSO 💜

the kernel file lives right here, no cap:

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

and here's the whole friend group, the entire squad of sibling tests — all of them, we're not skipping a 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_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_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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and that's the page!! sign-off time 🎀 this gem comes from ./drivers/gpu/drm/amd/display/... and it's dated October 2026, so go forth and test your PBN divider, bestie — you're gonna slay 💅✨🦋