dm_test_link...rsu_no_dmcub(9)

✨ NAME ✨

okay bestie, so this is dm_test_link_supports_psrsu_no_dmcub — and it's literally a KUnit test that's all about how DMCUB support is required. that's the whole vibe. it's checking that thing where no DMCUB = no psrsu, periodt 💅

(also hi, this page lives in the Kernel API Manual and we're gonna get into it 🫶)

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🌸 SYNOPSIS 🌸

void dm_test_link_supports_psrsu_no_dmcub (struct kunit *test );

ngl it's giving very "takes one thing, returns nothing" energy and honestly? iconic. no return value, no drama, just vibes ✨

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🎀 ARGUMENTS 🎀

• test — the KUnit test context 💖 that's it, that's the whole argument. she's the main character here and she carries the test info so the harness knows what's up 🧚

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🦋 SEE ALSO 🦋

okay so there's a whole friend group of tests and you should fr fr go meet all of them 👑

The kernel file they all live in:

• ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_psr_test.c — the mothership 🏠

The psrsu test girlies:

• dm_test_link_supports_psrsu_old_dcn(9)
• dm_test_link_supports_psrsu_panel_unsupported(9)
• dm_test_link_supports_psrsu_missing_alpm(9)
• dm_test_link_supports_psrsu_missing_y_coordinate(9)
• dm_test_link_supports_psrsu_missing_granularity(9)
• dm_test_link_supports_psrsu_debug_mask_disabled(9)
• dm_test_link_supports_psrsu_temporarily_disabled(9)

The set_psr_caps squad:

• dm_test_set_psr_caps_null_link(9)
• dm_test_set_psr_caps_null_connector(9)
• dm_test_set_psr_caps_no_dmub_psr(9)
• dm_test_set_psr_caps_non_edp(9)
• dm_test_set_psr_caps_disconnected(9)
• dm_test_set_psr_caps_no_dpcd_psr(9)
• dm_test_set_psr_caps_edp1_disabled(9)
• dm_test_set_psr_caps_success_psr1(9)

The psr event crew:

• dm_test_psr_set_event_get_event_fails(9)
• dm_test_psr_set_event_already_set(9)
• dm_test_psr_set_event_updates_event(9)

And the is_active_allowed besties:

• dm_test_psr_is_active_allowed_no_streams(9)
• dm_test_psr_is_active_allowed_null_link(9)
• dm_test_psr_is_active_allowed_requires_enabled_and_allowed(9)
• dm_test_psr_is_active_allowed_any_stream(9)

like, that's the entire group chat and every single one of them is invited to the function-name party 🎉

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and that's the page, bestie!! this cutie came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so mark your calendar, she's from the future 💀⏰ slay 💜