drivers/gpu/drm/amd/display/dc/mmhubbub/dcn42
AMD DCN 4.2 MMHUBBUB Display Block
Internal component code for the Memory Hub Bubble (MMHUBBUB) hardware block inside AMD's DCN 4.2 display controller, which handles memory writeback paths in the Display Core. It is part of the larger amdgpu display pipeline used by recent AMD Radeon GPUs and APUs, not a separate device driver.
not-a-driver
recommendation
This is not actually a driver directory; it is a sub-block of AMD's Display Core (DC) inside the amdgpu graphics driver, specifically the DCN 4.2 generation's memory hub writeback logic. It only ships as part of the broader AMD display stack and has no independent lifecycle of its own.
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codex reasoning notes (technical)
Not a driver directory: DCN4.2 MMHUBBUB block implementation inside the AMD display stack, not a standalone kernel-bound hardware driver.