dcn32_allow...refresh_rate(9)

💅 dcn32_allow...refresh_rate(9) — the Kernel API Manual glow-up 🎀

okay bestie, so this one is from the Kernel API Manual, section 9, and it's literally called dcn32_allow_subvp_high_refresh_rate. yes that's a mouthful, no we're not scared of it 💖

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✨ NAME ✨

dcn32_allow_subvp_high_refresh_rate — bestie's job is to figure out whether a high refresh rate config will actually allow subvp. that's it, that's the whole gig 🫶

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🌸 SYNOPSIS 🌸

bool dcn32_allow_subvp_high_refresh_rate (struct dc *dc , struct dc_state *context , struct pipe_ctx *pipe );

it returns a bool, she takes three structs, and she's gonna tell you yes or no. main character energy honestly 👑

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🦋 ARGUMENTS 🦋

• dc — the current DC state. like, what things look like right now, no cap.
• context — the new DC state that's about to be programmed. the future, the potential, the vibe check 💫
• pipe — the pipe we're considering for use in subvp. she's the one on trial here 🙈

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⭐ DESCRIPTION ⭐

so here's the tea: on high refresh rate display configs, we'll allow subvp only if all of these conditions hit. all five. no skipping, bestie 😤

1. Resolution is 3840x2160, 3440x1440, or 2560x1440 — those three, that's the list 🔥
2. Refresh rate is between 120hz - 165hz — the sweet spot zone 🌈
3. No scaling. none. zero. keep it native 💅
4. Freesync is inactive — she's gotta be asleep for this, sorry 🎀
5. For single display cases, freesync must be disabled — yes this one's a double-confirm, they really mean it 😭

okay so like, points 4 and 5 are both about freesync because freesync is NOT invited to this party. periodt.

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💜 RETURN 💜

• True — the pipe can be used for subvp. slay, she's in 🎉
• false — she cannot. not this time, bestie 💀

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👑 SEE ALSO 👑

the kernel file lives right here, iconic location:

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

and here's the whole friend group, all of them, in order:

• dcn32_helper_populate_phantom_dlg_params(9)
• 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_determine_max_vratio_prefetch(9)
• dcn32_assign_fpo_vactive_candidate(9)
• dcn32_find_vactive_pipe(9)

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and that's a wrap, bestie! 🧚💖 this little icon came out of the kernel source at ./drivers/gpu/drm/amd/display/..., dated October 2026, and she answers to dcn32_allow...refresh_rate(9) — go forth and check your refresh rates, mwah 😘💅