dm_test_crt...ce_no_stream(9)

💅 dm_test_crt...ce_no_stream(9) — like, the Kernel API Manual one 🎀

okay bestie, so this is a page straight out of the Kernel API Manual and it's about one (1) very specific little test. it's short, it's sweet, and honestly? it ate. let's get into it ✨

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🌸 NAME 🌸

dm_test_crtc_configure_crc_source_no_stream — the test that handles the whole "wait, there's no stream??" situation. missing-stream handling, babe. that's the whole gig 🦋

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✨ SYNOPSIS ✨

void dm_test_crtc_configure_crc_source_no_stream (struct kunit *test );

like, that's it. one function, takes a test pointer, returns nothing because it's a void king 👑

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🎀 ARGUMENTS 🎀

• test — the KUnit test context. it's the little backstage pass that lets the test do test things. you don't gotta make it, it just shows up 💖

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💜 DESCRIPTION 💜

okay so here's the vibe: this test checks that when the CRTC state does not have a stream, the configuration gets deferred/rejected before any DC access happens. like, no DC access at all. zero. none. not even a little peek 👀

the way it verifies that is literally the entire point. no stream = no touching DC. periodt 💅

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🌈 SEE ALSO 🌈

so you wanna go deeper? valid. here's the whole friend group:

the file itself — go read the source bestie:

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

and the rest of the crc test squad, in the order the page gives them:

• dm_test_crtc_get_crc_sources(9)
• dm_test_crtc_verify_crc_source_valid(9)
• dm_test_crtc_verify_crc_source_invalid(9)
• dm_test_crtc_configure_crc_source_dprx(9)
• dm_test_crtc_configure_crc_source_dprx_dither(9)
• dm_test_crtc_configure_crc_source_crtc(9)
• dm_test_crtc_configure_crc_source_crtc_dcn36_poly(9)
• dm_test_crtc_configure_crc_source_crtc_configure_fails(9)
• dm_test_crtc_configure_crc_source_none(9)
• dm_test_crtc_set_crc_source_invalid(9)
• dm_test_crtc_set_crc_source_none_no_stream(9)
• dm_test_crtc_set_crc_source_none_commit(9)
• dm_test_crtc_set_crc_source_dprx_no_connector(9)
• dm_test_crtc_handle_crc_irq_early_returns(9)
• dm_test_crtc_handle_crc_irq_disabled_source(9)
• dm_test_crtc_handle_crc_irq_skips_initial_frames(9)
• dm_test_crtc_handle_crc_irq_dprx_after_skip(9)
• dm_test_crtc_handle_crc_irq_get_crc_fails(9)
• dm_test_need_dp_aux(9)
• dm_test_crc_source_should_start_dprx(9)
• dm_test_crc_source_should_stop_dprx(9)

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ngl that's the whole page 😭 it's a tiny little manpage for a tiny little test and honestly? iconic. go read the other ones if you're nosy 🫶

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and that's a wrap, bestie 💖 this one came from the source path ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so mark your calendar, she's from the future 🦋✨👑