snd_hdac_power_up(9)

💖 NAME 💖

okay so bestie, welcome to the snd_hdac_power_up(9) page from the Kernel API Manual — yes, the manual name is literally in the group chat, and today’s main character function is snd_hdac_power_up 💅. Its whole thing? power up the codec. That’s the name, that’s the game, no cap.

✨ SYNOPSIS ✨

int snd_hdac_power_up (struct hdac_device *codec );

🎀 ARGUMENTS 🎀

• codec — the codec object 🫶. That’s it. That’s the argument. Iconic minimalism, honestly.

🌸 DESCRIPTION 🌸

Okay so real talk: this function calls the runtime PM helper to power up the given codec. It’s giving “wake up bestie, we have codec things to do” ✨.

But here’s the tea ☕: unlike snd_hdac_power_up_pm, you should call this only for the code path that isn’t included in PM path. Otherwise it gets stuck. Not “slay” stuck — like actually stuck 😭. So keep it out of the PM path, mmkay?

Returns zero if successful, or a negative error code. Periodt.

🦋 SEE ALSO 🦋

Kernel file ./sound/hda/core/device.c — and honestly the whole friend group is here, so lemme introduce you:

• snd_hdac_device_init(9)
• snd_hdac_device_exit(9)
• snd_hdac_device_register(9)
• snd_hdac_device_unregister(9)
• snd_hdac_device_set_chip_name(9)
• snd_hdac_codec_modalias(9)
• snd_hdac_make_cmd(9)
• snd_hdac_exec_verb(9)
• snd_hdac_read(9)
• _snd_hdac_read_parm(9)
• snd_hdac_read_parm_uncached(9)
• snd_hdac_override_parm(9)
• snd_hdac_get_sub_nodes(9)
• snd_hdac_refresh_widgets(9)
• snd_hdac_get_connections(9)
• snd_hdac_power_down(9)
• snd_hdac_power_up_pm(9)
• snd_hdac_power_down_pm(9)
• snd_hdac_stream_format_bits(9)
• snd_hdac_stream_format(9)
• snd_hdac_spdif_stream_format(9)
• snd_hdac_query_supported_pcm(9)
• snd_hdac_is_supported_format(9)
• snd_hdac_codec_read(9)
• snd_hdac_codec_write(9)
• snd_hdac_check_power_state(9)
• snd_hdac_sync_power_state(9)

🌈 that’s the whole page, bestie! source/version vibes: ./sound/hda/core, dated October 2026. mwah 💋 — your resident kernel bestie, signing off with snd_hdac_power_up(9) energy forever 🎀💖