dcn32_get_num_free_pipes(9)

💅 dcn32_get_num_free_pipes — a Kernel API Manual moment ✨

okay so bestie, welcome to the Kernel API Manual, and today's main character is dcn32_get_num_free_pipes — yes she's a function, yes she counts pipes, yes this is her whole thing 🎀

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✨ NAME ✨

dcn32_get_num_free_pipes — literally just calculating the number of free pipes, that's it, that's the gig 💖

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🌸 SYNOPSIS 🌸

unsigned int dcn32_get_num_free_pipes (struct dc *dc , struct dc_state
*context );

like, she takes two structs and hands you back an unsigned int, no drama 🫶

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🦋 ARGUMENTS 🦋

• dc — the current dc state, as in right now, the present tense one 👑
• context — the new dc state, the one we're like... considering 💭

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🔥 DESCRIPTION 🔥

okay so the vibe check here is this: this function assumes that a "used" pipe is a pipe that has both a stream and a plane assigned to it. both. no cap. if it's missing either one, she's not counting it as used, periodt 💅

like, that's the whole assumption, that's the rule, don't come at her with edge cases she didn't ask for 🙈

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⭐ RETURN ⭐

she returns the number of free pipes available in the context — i.e. the new dc state, in case you forgot already (no judgment, it's a lot) 🍓

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c — yes, that's where she lives, go say hi 🧚
• dcn32_helper_populate_phantom_dlg_params(9)
• dcn32_set_phantom_stream_timing(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)

like, the whole subvp friend group honestly 😭 obsessed 💜

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and that's the page, bestie — sourced straight from ./drivers/gpu/drm/amd/display/..., dated October 2026, and she's filed under dcn32_get_num_free_pipes(9). slay, go count some pipes 🎀✨💖