vc4_mock_atomic_del_output(9)

💅 vc4_mock_atomic_del_output — a whole page from the Kernel API Manual 🎀

okay bestie, sit down, because today we're looking at vc4_mock_atomic_del_output — yes that's the whole name, yes it's a mouthful, no we're not shortening it, it's iconic and it deserves its full government name. This is the fourth page of the Kernel API Manual and honestly? she ate. 🦋

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✨ NAME ✨

vc4_mock_atomic_del_output — literally just disables an output in a state. that's the whole vibe check. 💅

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🌸 SYNOPSIS 🌸

int vc4_mock_atomic_del_output (struct kunit *test , struct
       drm_atomic_commit *state , enum vc4_encoder_type type );

like yes, she returns an int, and yes, she takes three things. we'll get to those. 🫶

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💖 ARGUMENTS 💖

• test — the test context object. hi bestie, it's your kunit test, she's the main character here 👑
• state — the atomic state you want the output disabled in. this is the one getting the glow-down ✨
• type — the type of the output encoder. enum vc4_encoder_type, no cap 🧚

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🌈 DESCRIPTION 🌈

so what does she actually do? she adds an output CRTC and a connector to a state — and then disables them. both. added, then switched off. it's giving "invited to the party and immediately uninvited" energy 😭

that's it. that's the whole description. short, sweet, slay. 💜

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⭐ RETURN ⭐

• returns 0 on success 🎉
• returns a negative error code on failure 💀
• > ⚠️ and listen carefully bestie: if that error is EDEADLK, the entire atomic sequence must be restarted. not a little restart. the whole sequence. periodt.
• all other errors are fatal — like, no coming back from those 🙈

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/vc4/tests/vc4_mock_output.c — go read the source, iykyk 📖
• vc4_mock_atomic_add_output(9) — the add version, the sibling, the sister page 💕

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and that's the page! shoutout to the source over in ./drivers/gpu/drm/vc4/tests, dated October 2026, living under the title vc4_mock_atomic_del_output(9) in the Kernel API Manual — mwah, love that for her 💋🌸✨