dc_get_unde...data_for_otg(9)

💅 dc_get_underflow_debug_data_for_otg(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — yes this is a kernel API manual page, and yes it's about the AMD display core, and no you don't have to be scared, i got you 🫶

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🌸 NAME 🌸

dc_get_underflow_debug_data_for_otg — the little function that goes and gets your underflow debug data for you. literally that's the whole job. she retrieves underflow debug data 💖

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⭐ SYNOPSIS ⭐

void dc_get_underflow_debug_data_for_otg (struct dc *dc , unsigned int
primary_otg_inst , struct dc_underflow_debug_data *out_data );

she returns void (nothing back, it's all going into out_data), no cap 🎀

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🦋 ARGUMENTS 🦋

• dc — pointer to the display core context, iykyk 👑
• primary_otg_inst — the instance index of the primary OTG that underflowed. like, which one fell over, bestie 😭
• out_data — pointer to a dc_underflow_debug_data struct that gets filled up with all the debug information. she's the container, she's the main character here 🎀

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✨ DESCRIPTION ✨

so what does she actually do? okay so when underflow happens, this function collects and logs the underflow-related HW states 💅 and the roster of what she scoops up is:

• OTG underflow status
• current read positions
• frame count
• per-HUBP debug data

and where does all that go? into the provided out_data structure ofc 🌈 so you can look at it later for further analysis or logging. it's giving "data collector, but make it iconic". periodt 💜

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🔥 SEE ALSO 🔥

all the related reads, fr fr — these live in the kernel file ./drivers/gpu/drm/amd/display/dc/dc.h:

• MAX_SURFACES(9)
• MAX_PLANES(9)
• color-management-caps(9)
• struct rom_curve_caps(9)
• struct dpp_color_caps(9)
• struct mpc_color_caps(9)
• struct dc_color_caps(9)
• enum pipe_split_policy(9)
• dc_check_state_update(9)
• dc_update_state(9)
• dc_update_state_init(9)
• dc_update_state_prepare(9)
• dc_update_state_execute(9)
• dc_update_state_cleanup(9)
• struct dc_probe_latencies(9)
• struct dc_probe_status(9)
• enum dc_get_status_type(9)
• struct dc_get_status_options(9)
• struct dc_state_status(9)
• dc_state_get_status(9)
• struct dc_validation_stream(9)
• struct dc_validation_set(9)
• dc_capture_register_software_state(9)
• dc_get_qos_info(9)
• dc_override_memory_bandwidth_request(9)

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💀 quick vibe check: this page lives under ./drivers/gpu/drm/amd/display/dc, version date October 2026. go read the source if you want the deep lore, bestie 🙈

anyway that's the page!! you ate that, go debug those underflows 💖✨🎀🦋🌸💅🫶🔥👑🌈⭐💜🍓🧚