disallow_su...e_plus_blank(9)

💅 disallow_subvp_in_active_plus_blank (Kernel API Manual)

okay so bestie, welcome to the Kernel API Manual — this one's a tiny little function with big "I'm the bouncer at the club" energy. Let's get into it ✨

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🌸 NAME

disallow_subvp_in_active_plus_blank — the function that decides which subvp + drr/vblank configs are a hard no 🙅‍♀️

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🦋 SYNOPSIS

bool disallow_subvp_in_active_plus_blank (struct pipe_ctx *pipe );

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🎀 ARGUMENTS

• pipe — the subvp pipe we're checking for the subvp + drr/vblank config 🫶

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💖 DESCRIPTION

So here's the tea: subvp is getting enabled on more and more configs (yes, even 1080p60 👀), and the devs were like "okay we need to be explicit about what we don't want." So this function literally exists to block the configs nobody wants turned on.

Specifically — no 1080p60 (SubVP) + drr / vblank configs allowed, periodt 💅 because those are already covered by FPO. No need to double up, it's giving redundant.

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✨ RETURN

True if it's disallowed, false otherwise. Simple as that 💁‍♀️

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🔥 SEE ALSO

• Kernel file
• ./drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c
• dcn32_helper_calculate_num_ways_for_subvp(9)
• dcn32_determine_det_override(9)
• dcn32_can_support_mclk_switch_using_fw_based_vblank_stretch(9)
• dcn32_subvp_drr_admissable(9)
• dcn32_subvp_vblank_admissable(9)

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and that's the whole page, bestie 🧚 — brought to you by ./drivers/gpu/drm/amd/display/..., all the way from October 2026. go forth and block those configs 🌈💜