dcn42_hw_block_power_down(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dcn42_hw_block_power_down(9) — from the Kernel API Manual

okay bestie, welcome to the kernel API manual page for dcn42_hw_block_power_down ✨ this is a section 9 (kernel API) kinda situation and she is so ready to teach you about turning hardware blocks off. buckle up 🎀

🌸 NAME 🌸

dcn42_hw_block_power_down — the power down sequence. that's it, that's the vibe 💖

✨ SYNOPSIS ✨

void dcn42_hw_block_power_down (struct dc *dc , struct pg_block_update
*update_state );

literally just a void function, no return value, no drama 🫶

🦋 ARGUMENTS 🦋

  • dc — the Current DC state. main character energy, she holds everything 💅
  • update_state — updates the PG sequence states for the HW block. yes queen, keep that bookkeeping cute ✨

💜 DESCRIPTION 💜

okay so the following sequence describes the ON-OFF (ONO) for power down. read it in order, top to bottom, no skipping 🙈

  • ONO Region 4, DCPG 25: hpo
  • ONO Region 11, DCPG 3: dchubp3, dpp3
  • ONO Region 9, DCPG 2: dchubp2, dpp2
  • ONO Region 7, DCPG 1: dchubp1, dpp1
  • ONO Region 5, DCPG 0: dchubp0, dpp0
  • ONO Region 2, DCPG 23: dchubbub, dchububmem, dchvm
  • ONO Region 12, DCPG 19: dsc3
  • ONO Region 10, DCPG 18: dsc2
  • ONO Region 8, DCPG 17: dsc1
  • ONO Region 6, DCPG 16: dsc0
  • ONO Region 3, DCPG 24: mpc, opp, optc, dwb
  • ONO Region 1, DCPG 26: dio
  • ONO Region 0, DCPG 22: dccg dcio dcoh — SKIPPED 💀

and now the note, bestie, pay attention:

there's No seuential ONO power up/down order for DCN42. Driver PG should only be limited to DCHUBP/DPP, DSC, HPO and DIO, so further optimization can be done 🧚

ngl the "seuential" spelling is straight from the source, she's doing her best and we love her for it 💅

🌈 SEE ALSO 🌈

  • Kernel file ./drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c
  • dcn42_hw_block_power_up(9) — the other half of the saga, go read her too 🫶

and that's the whole page, periodt 💖 this lil beauty comes from ./drivers/gpu/drm/amd/display/... in October 2026 — go forth and power things down responsibly, iykyk 🎀⭐

📦 where this page comes from