dcn35_hw_block_power_down(9)

💅 dcn35_hw_block_power_down — the "okay everybody go night-night" era

So this is a page from the Kernel API Manual, and bestie, it's a whole function about putting hardware blocks to sleep in a very specific order. Let's get into it ✨

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✨ NAME ✨

dcn35_hw_block_power_down — the power down sequence. That's it, that's the whole vibe. It turns things off. In order. Respect the order. 🎀

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🌸 SYNOPSIS 🌸

void dcn35_hw_block_power_down (struct dc *dc, struct pg_block_update *update_state);

Returns void, so like… no return value, no feedback, no "did I do a good job?" It just does the thing. Iconic, honestly. 💅

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🦋 ARGUMENTS 🦋

• dc — the current DC state. Like, the whole situation right now. Current. DC. State. 🫶
• update_state — this one updates the PG sequence states for the HW block. That's literally the job description, no cap.

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🔥 DESCRIPTION 🔥

Okay so here's the tea: this function runs the ON-OFF (ONO) sequence for power down. The order is not a suggestion, it's the itinerary, and everyone hits their stop in the right order, periodt.

Here's the itinerary, exactly as written:

• ONO Region 3, DCPG 25: hpo — SKIPPED
• ONO Region 4, DCPG 0: dchubp0, dpp0
• ONO Region 6, DCPG 1: dchubp1, dpp1
• ONO Region 8, DCPG 2: dchubp2, dpp2
• ONO Region 10, DCPG 3: dchubp3, dpp3
• ONO Region 1, DCPG 23: dchubbub, dchvm, dchubbubmem — SKIPPED. Why? Because PMFW will pwr dwn at IPS2 entry. Not our problem, they got it 💀
• ONO Region 5, DCPG 16: dsc0
• ONO Region 7, DCPG 17: dsc1
• ONO Region 9, DCPG 18: dsc2
• ONO Region 11, DCPG 19: dsc3
• ONO Region 2, DCPG 24: mpc, opp, optc, dwb
• ONO Region 0, DCPG 22: dccg, dio, dcio — SKIPPED. Because it'll be pwr dwn after the lono timer is armed. Timing queen behavior ⏰

And here's the plot twist, bestie: if sequential ONO is specified, the order gets modified. It goes from ONO Region 11 → ONO Region 0 descending. So the whole middle section flips around. Don't say I didn't warn you 🙈

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💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c — go read the source, iykyk 🧚
• dcn35_hw_block_power_up(9) — the sequel. The glow-up. The "we're so back" to this page's "it's over" 🌈

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Okay that's the whole page, you ate it up fr fr 🍓 This was the Kernel API Manual energy, sourced from ./drivers/gpu/drm/amd/display/..., dated October 2026 — love that for us. Go forth and power down responsibly, bestie 💖✨👑