amdgpu_dm_p...cro_tile_idx(9)

okay so welcome to the Kernel API Manual, bestie 💖 this page is all about a little function that picks a macro tiling mode index, and it’s giving very specific GPU vibes. No cap.

💖 NAME 💖

amdgpu_dm_plane_get_gfx7_macro_tile_idx — Get macro tile mode index on GFX7-8 ✨

✨ SYNOPSIS ✨

u32 amdgpu_dm_plane_get_gfx7_macro_tile_idx (const u32 bpp , const u32 tile_split_bytes );

🎀 ARGUMENTS 🎀

• bpp — bits per pixel in the image 🖼️
• tile_split_bytes — actual tile split bytes, see amdgpu_dm_plane_calc_gfx7_tile_split 👀

🦋 DESCRIPTION 🦋

So what it does is select which macro tiling mode from the table is suitable for the given bits per pixel, assuming 2D_TILED_THIN1 array mode and DISPLAY micro tile mode (and no multisampling). Literally that’s the whole assignment. 💅

Important vibe check: the tiling table is uAPI, and userspace relies on specific modes being present at specific indices. So don’t go rearranging it for fun, bestie 😭. See CiLib::HwlComputeMacroModeIndex in addrlib for the reference.

🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
• amdgpu_dm_plane_get_gfx6_tile_idx(9)
• amdgpu_dm_plane_calc_gfx7_tile_split(9)
• amdgpu_dm_plane_calc_gfx6_mod(9)
• amdgpu_dm_plane_gfx6_format_mod_supported(9)
• amdgpu_dm_plane_add_gfx6_modifiers(9)

and that’s the whole page — signing off from the ./drivers/gpu/drm/amd/display/... source/version, dated October 2026 💖🫶