dcn32_helper...m_dlg_params(9)

✨ dcn32_helper_populate_phantom_dlg_params ✨

okay bestie, welcome to the Kernel API Manual 💖 this one's a lil function with a big name and honestly? she's kind of a diva about scheduling. let's get into it 🫶

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🌸 NAME 🌸

dcn32_helper_populate_phantom_dlg_params — literally the girl who goes and gets the DLG params for the phantom pipes</> and then populates pipe_ctx with them. no cap, that's the whole job 💅

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🦋 SYNOPSIS 🦋

void dcn32_helper_populate_phantom_dlg_params (struct dc *dc , struct
dc_state *context , display_e2e_pipe_params_st *pipes , int pipe_cnt );

she takes four things and returns void (so she gives you vibes, not a return value, periodt ✨)

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🎀 ARGUMENTS 🎀

• dc [in] — the current dc state. like, right now. present tense. the main character 🌟
• context [in] — the new dc state. the glow-up version, iykyk 🦋
• pipes [in] — the DML pipe params array. it's giving very much "the data" 📊
• pipe_cnt [in] — the DML pipe count, an int. she counts. she slays. 🔢

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👑 DESCRIPTION 👑

okay so this is the important part, listen up 🙈

This function must be called AFTER the phantom pipes are added to context and run through DML — like, that's the whole point, so that the DLG params for the phantom pipes can actually be populated 💖

And it must be called BEFORE we program the timing for the phantom pipes. not after. before. fr fr, the order matters, this is not a drill 😭

⚠️ bestie, do NOT get the ordering twisted. AFTER the pipes are added + through DML, BEFORE the timing gets programmed. that's the vibe check and she will fail you if you skip it 💀

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🌈 SEE ALSO 🌈

the squad, the friend group, the whole kernel file they all live in:

./drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c

and the besties themselves 🔥

• dcn32_set_phantom_stream_timing(9)
• dcn32_get_num_free_pipes(9)
• dcn32_assign_subvp_pipe(9)
• dcn32_enough_pipes_for_subvp(9)
• subvp_subvp_schedulable(9)
• subvp_drr_schedulable(9)
• subvp_vblank_schedulable(9)
• subvp_subvp_admissable(9)
• subvp_validate_static_schedulability(9)
• dcn32_allow_subvp_high_refresh_rate(9)
• dcn32_determine_max_vratio_prefetch(9)
• dcn32_assign_fpo_vactive_candidate(9)
• dcn32_find_vactive_pipe(9)

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🫶 that's the page!! she comes from ./drivers/gpu/drm/amd/display/... and she's stamped October 2026 — so yeah, she's from the future, iconic behavior honestly. study her, love her, call the functions in the right order, and you're gonna ate 💅✨🍓