drm_writeba...with_encoder(9)

✨ drm_writeba...with_encoder(9) ✨

okay so bestie, welcome to the Kernel API Manual page for drm_writeba...with_encoder(9) — literally the longest function name in the DRM cinematic universe and we're gonna get through it together 🫶

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🌸 NAME 🌸

drm_writeback_connector_init_with_encoder — initializes a writeback connector, but like… with a custom encoder. you bring your own encoder, she brings the connector. it's giving collaboration 💅

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🎀 SYNOPSIS 🎀

int drm_writeback_connector_init_with_encoder (struct drm_device *dev ,
struct drm_writeback_connector *wb_connector , struct drm_encoder *enc ,
const struct drm_connector_funcs *con_funcs , const u32 *formats , int
n_formats );

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🦋 ARGUMENTS 🦋

• dev — the DRM device. the main character of the whole operation tbh.
• wb_connector — the writeback connector you want to initialize. she's getting her glow-up right here ✨
• enc — a handle to the drm encoder that's already initialized. not new. pre-owned. vintage, even 💖
• con_funcs — the connector funcs vtable. all the little function pointers that tell the connector how to behave.
• formats — an array of the pixel formats your writeback engine supports. the whole menu 🍓
• n_formats — length of the formats array. like, how many items are actually on that menu.

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💜 DESCRIPTION 💜

so what does she actually do? okay so:

This function creates the writeback-connector-specific properties if they haven't already been created, initializes the connector as type DRM_MODE_CONNECTOR_WRITEBACK, and correctly initializes the property values. no cap, that's the whole vibe check.

⚠️ important assumption alert ⚠️ this function assumes that the drm_writeback_connector's encoder has already been created and initialized before you invoke this function. do not come in here with a half-baked encoder, she will not fix that for you 😭

In addition, this function also assumes that callers of this API will manage assigning the encoder helper functions, possible_crtcs and any other encoder specific operation. yes bestie, that's on you. main character responsibilities 🔥

Drivers should always use this function instead of drm_connector_init to set up writeback connectors if they want to manage themselves the lifetime of the associated encoder. like, always. periodt. 👑

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🌈 RETURN 🌈

0 on success, or a negative error code. so if you get something negative back, that's your villain origin story and you should go debug it 🙈

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⭐ SEE ALSO ⭐

go read these next, iykyk:

• Kernel file ./drivers/gpu/drm/drm_writeback.c overview(9)
• drm_writeback_connector_init(9)
• __drm_writeback_connector_init(9)
• drm_writeback_connector_cleanup(9)
• drmm_writeback_connector_init(9)
• drm_writeback_queue_job(9)
• drm_writeback_signal_completion(9)

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and that's the page, bestie 🧚💖 this lil masterpiece lives in ./drivers/gpu/drm, dated October 2026, and it's filed under drm_writeba...with_encoder(9) in the Kernel API Manual — slay, go write some writeback connectors 💅✨