populate_subvp_cmd_drr_info(9)

💅 populate_subvp_cmd_drr_info(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this one's a little function from the kernel side of things, and honestly? it's giving behind-the-scenes main character energy. let's get into it 🫶

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🌸 NAME 🌸

populate_subvp_cmd_drr_info — the lil helper that populates the DRR pipe info for the DMCUB subvp command 🎀

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✨ SYNOPSIS ✨

void populate_subvp_cmd_drr_info (struct dc *dc , struct dc_state
*context , struct pipe_ctx *subvp_pipe , struct pipe_ctx *vblank_pipe ,
struct dmub_cmd_fw_assisted_mclk_switch_pipe_data_v2 *pipe_data );

no cap, that's the whole signature 💀 — five args, all pointers, all business.

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🦋 ARGUMENTS 🦋

• dc [in] — pointer to the dc object, iconic, we love her 💖
• context [in] — the DC state, and it's here so we can get at the phantom stream 👀
• subvp_pipe [in] — the pipe_ctx for the SubVP pipe, the star of the show ⭐
• vblank_pipe [in] — the pipe_ctx for the DRR pipe, also very important, don't forget her 🙈
• pipe_data [in] — the pipe data that stores the VBLANK/DRR info, literally the whole point 💅

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💜 DESCRIPTION 💜

so what does it actually do? bestie, it populates the DMCUB SubVP command with the DRR pipe info. every single thing you need for calculating the SubVP + DRR microschedule gets populated right here. periodt. 🔥

the high level algorithm, laid out cute:

1. get the timing for the SubVP pipe, the phantom pipe, and the DRR pipe 🌈
2. calculate the min and max vtotal that supports the SubVP + DRR microschedule 🧮
3. populate the drr_info with those min and max supported vtotal values ✨

three steps, no notes, ate and left no crumbs 👑

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🎀 SEE ALSO 🎀

• Kernel file ./drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
• populate_subvp_cmd_vblank_pipe_info(9)
• update_subvp_prefetch_end_to_mall_start(9)
• populate_subvp_cmd_pipe_info(9)
• dc_dmub_setup_subvp_dmub_command(9)
• dc_send_update_cursor_info_to_dmu(9)

the whole friend group fr fr 💖 go say hi to all of them 🫶

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k that's the page!! it lives over in ./drivers/gpu/drm/amd/display/dc, the date on it is October 2026, and the source/version line is literally just that same populate_subvp_cmd_drr_info(9) name again — so yeah, this page is its own vibe check 💅✨ bye bestie, slay responsibly 🦋🌸