STRUCT KOMEDA_FORMAT_CAPS(9)

✨ struct komeda_format_caps(9) ✨

okay so this is a page straight outta the Kernel API Manual — yes that Kernel API Manual 💅 — and it's all about struct komeda_format_caps. she's niche, she's ARM-display-coded, and she's here to tell you what a format can and can't do. let's get into it 🫶

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🌸 NAME 🌸

struct komeda_format_caps — literally the struct, bestie. the original doesn't even give her a tagline, she just is.

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🦋 SYNOPSIS 🦋

struct komeda_format_caps {
    u32 hw_id;
    u32 fourcc;
    u32 supported_layer_types;
    u32 supported_rots;
    u32 supported_afbc_layouts;
    u64 supported_afbc_features;
};

look at her. six fields. no notes. iconic 👑

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🎀 Members 🎀

• hw_id — the hw format id, and it's a hw-specific value. so like… hardware's own little name tag 🏷️
• fourcc — the drm fourcc format. your classic four-character-code moment ✨
• supported_layer_types — tells you which layer actually supports this format. like, who's invited to the party 💌
• supported_rots — the allowed rotations for this format. spin it, but only the legal amount 🔄
• supported_afbc_layouts — the supported afbc layerout. (that's a layerout, not a layout — copying it exactly because the manpage said so, no cap 🙈)
• supported_afbc_features — the supported afbc features. it's a u64, she's got range 💜

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🌈 Description 🌈

so komeda_format_caps is for describing ARM display specific features and limitations for a specific format. that's her whole job. main character energy, honestly 👑

and here's the cute part: format_caps will be linked into komeda_framebuffer like a extension of drm_format_info. yes, exactly like that — "a extension". we don't fix the grammar of the source, we respect the source 😭🫶

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💀 NOTE 💀

one fourcc may has two different format_caps items for fourcc and fourcc+modifier. 🚨

(again: "may has". the manpage said it, so i said it. fr fr.)

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h 🗂️
• struct komeda_format_caps_table(9) — the sequel, go read it 🧚

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okay that's the whole page, mwah 💋 and for the sign-off: this lil beauty lives in ./drivers/gpu/drm/arm/display/... and it's dated October 2026, so like… she's from the future, bestie. slay. 🎀🌸💖