dmub_srv_hw_init(9)

✨ dmub_srv_hw_init(9) ✨

okay bestie, so this page is straight out of the Kernel API Manual and it's literally all about dmub_srv_hw_init 💅 it wakes up the actual DMUB hardware and gets it ready for the main character era. sit down, hydrate, let's go 🫶

🌸 NAME 🌸

dmub_srv_hw_init — initializes the underlying DMUB hardware. yes that's it, that's the whole vibe.

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🎀 SYNOPSIS 🎀

enum dmub_status dmub_srv_hw_init (struct dmub_srv *dmub , const struct
       dmub_srv_hw_params *params );

🦋 ARGUMENTS 🦋

• dmub — the dmub service. it's giving main character energy, everything runs through it 💖
• params — params for hardware initialization. like, literally the settings for the glow-up.

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💜 DESCRIPTION 💜

so what does it actually do? it resets the DMUB hardware and then does backdoor loading of the required cache regions, based on the input framebuffer regions. no cap, that's the whole thing ✨

lowkey it's a whole reset-and-reload situation. the hardware gets refreshed, then the cache regions it needs get slipped in through the backdoor, all decided by whichever framebuffer regions you handed it in params 💅

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🔥 RETURN 🔥

here's what you can get back, bestie, memorize these:

• DMUB_STATUS_OK — success. we ate. 👑
• DMUB_STATUS_NO_CTX — dmcub context not initialized 😭 like the context is missing, the vibe check failed.
• DMUB_STATUS_INVALID — unspecified error 💀 the classic "something's wrong but nobody's saying what."

heads up: DMUB_STATUS_NO_CTX means the dmcub context isn't initialized yet — don't come for this function before the context exists, fr fr 🙈

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🌈 SEE ALSO 🌈

the whole friend group 💖 iykyk:

• Kernel file ./drivers/gpu/drm/amd/display/dmub/dmub_srv.h
• DMUB interface and operation(9)
• struct dmub_region(9)
• struct dmub_window(9)
• struct dmub_fb(9)
• struct dmub_srv_region_params(9)
• struct dmub_srv_fw_meta_info_params(9)
• struct dmub_srv_region_info(9)
• struct dmub_srv_memory_params(9)
• struct dmub_srv_fb_info(9)
• struct dmub_soc_fb_info(9)
• struct dmub_diagnostic_data(9)
• struct dmub_preos_info(9)
• struct dmub_srv_base_funcs(9)
• struct dmub_srv_hw_funcs(9)
• struct dmub_srv_create_params(9)
• struct dmub_srv(9)
• struct dmub_notification(9)
• dmub_srv_create(9)
• dmub_srv_destroy(9)
• dmub_srv_calc_region_info(9)
• dmub_srv_has_hw_support(9)
• dmub_srv_is_hw_init(9)
• dmub_srv_hw_reset(9)
• dmub_srv_fb_cmd_queue(9)
• dmub_srv_fb_cmd_execute(9)
• dmub_srv_wait_for_hw_pwr_up(9)
• dmub_srv_wait_for_auto_load(9)
• dmub_srv_wait_for_phy_init(9)
• dmub_srv_wait_for_pending(9)
• dmub_srv_wait_for_idle(9)
• dmub_srv_send_gpint_command(9)
• dmub_srv_get_gpint_response(9)
• dmub_srv_get_gpint_dataout(9)
• dmub_srv_flush_buffer_mem(9)
• dmub_srv_get_fw_boot_status(9)
• dmub_srv_send_inbox0_cmd(9)
• dmub_srv_wait_for_inbox0_ack(9)
• dmub_srv_subvp_save_surf_addr(9)
• dmub_srv_set_power_state(9)
• dmub_srv_reg_cmd_execute(9)
• dmub_srv_cmd_get_response(9)
• dmub_srv_sync_inboxes(9)
• dmub_srv_wait_for_inbox_free(9)
• dmub_srv_update_inbox_status(9)
• dmub_srv_get_preos_info(9)
• dmub_srv_get_fw_meta_info_from_raw_fw(9)

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that's the page, bestie 🧚 source path is ./drivers/gpu/drm/amd/display/... and it's dated October 2026, so like, future vibes only ⭐ mwah, go init that hardware 💋🍓