dm_test_crtc..._source_none(9)

✨ dm_test_crtc..._source_none(9) ✨

Okay bestie, so this one's from the Kernel API Manual, section 9 — yes, the section 9 of it all, we love a numbered chapter moment 💅. It's giving "tiny function, very specific job, absolutely iconic" energy. Let's get into it 🫶

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🌸 NAME 🌸

dm_test_crtc_configure_crc_source_none — the test that checks whether the CRC disable path actually, y'know, disables. No cap, that's the whole vibe 💖

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🦋 SYNOPSIS 🦋

void dm_test_crtc_configure_crc_source_none (struct kunit *test );

That's it. That's the whole signature. Returns nothing (void), takes exactly one thing, and it's a struct kunit *test. Clean, minimal, main character energy ✨

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🎀 ARGUMENTS 🎀

• test — the KUnit test context, i.e. the little backpack of test-runner stuff this function carries around. It's the only thing you hand it. Give it your test and let it cook 🍓

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👑 DESCRIPTION 👑

Okay so picture this: the function is verifying that when the CRC source is set to NONE, the DC CRC capture gets disabled properly — and on top of that, that the default dither and dynamic expansion get restored to where they belong.

So basically: turn the capture off, put the settings back the way mama left them. Verified. Slay 🔥

Not me being obsessed with a cleanup path — but honestly? A test that checks the restore actually happens is lowkey the most responsible thing in the whole file 💀💜

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🧚 SEE ALSO 🧚

The kernel file we're living in, for reference (iykyk):

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

And the whole squad of related tests — every single one, no skipping, fr fr:

• 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_no_stream(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_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)

Like, the entire friend group showed up to the group chat. We love a full roster 🤩

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💫 Sign-off 💫

This lil beauty lives under ./drivers/gpu/drm/amd/display/..., dated October 2026, and the manual page answers to the name dm_test_crtc..._source_none(9) — same as the title, because brand consistency is key 👑. Anyway bestie, go forth and disable some CRC sources responsibly. Mwah 💋🌈⭐