subvp_drr_schedulable(9)

✨ NAME ✨

okay so welcome to subvp_drr_schedulable(9) from the Kernel API Manual 💖 — this function is literally here to determine if a SubVP + DRR config is schedulable. no cap, that's the whole main-character job.

🌸 SYNOPSIS 🌸

here's the signature, exactly as it appears, bestie:

bool subvp_drr_schedulable (struct dc *dc , struct dc_state *context );

🎀 ARGUMENTS 🎀

• dc — current dc state
• context — new dc state

💅 DESCRIPTION 💅

the high level algorithm is giving step-by-step, and yes we're keeping every bit:

1. Get timing for SubVP pipe, phantom pipe, and DRR pipe.
2. Determine the frame time for the DRR display when adding required margin for MCLK switching (the margin is equal to the MALL region + DRR margin (500us)).
3. If (SubVP Active - Prefetch > Stretched DRR frame + max(MALL region, Stretched DRR frame)) then report the configuration as supported.

💖 RETURN 💖

returns True if the SubVP + DRR config is schedulable, and false otherwise ✨ periodt.

🦋 SEE ALSO 🦋

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

the whole SEE ALSO friend group, iykyk:

• 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_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)

mwah 💋 — footer source/version is ./drivers/gpu/drm/amd/display/..., the date is October 2026, and this whole icon is subvp_drr_schedulable(9) 🫶