dmub_srv_wait_for_auto_load(9)

💫 dmub_srv_wait_for_auto_load — the kernel API manual, but make it make sense

okay so bestie, welcome to dmub_srv_wait_for_auto_load(9) from the Kernel API Manual — yes that's the manual name, no I'm not making it up 💅 this one is a little function with one job and honestly? she ate.

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✨ NAME ✨

dmub_srv_wait_for_auto_load — literally just waits for firmware auto load to complete. that's it. that's the whole vibe 🎀

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🌸 SYNOPSIS 🌸

enum dmub_status dmub_srv_wait_for_auto_load (struct dmub_srv *dmub ,
uint32_t timeout_us );

copy it exactly bestie, character for character, don't get creative with the spacing 🙈

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🦋 ARGUMENTS 🦋

• dmub — the dmub service 👑 like, the whole service struct, she's the main character here
• timeout_us — the maximum number of microseconds to wait ⏳ that's your patience budget, in microseconds, no cap

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💖 DESCRIPTION 💖

okay so what she does is: waits until firmware has been autoloaded by the DMCUB. the maximum wait time is given in microseconds — that's the timeout_us from up there — specifically so she doesn't just spin forever like 😭 please. nobody has time for an infinite loop.

and here's the cute little detail: on ASICs without firmware autoload support, this function will return immediately. like, instant. no waiting, no drama, she's out 🫶

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⭐ RETURN ⭐

• DMUB_STATUS_OK — success!! we love to see it 💖
• DMUB_STATUS_TIMEOUT — wait for phy init timed out 😭 (yes, that's what it says — phy init)
• DMUB_STATUS_INVALID — unspecified error 💀 vague, unhelpful, but there it is

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🔥 SEE ALSO 🔥

first up, the kernel file itself: ./drivers/gpu/drm/amd/display/dmub/dmub_srv.h

then the whole friend group, and yes I'm listing every single one, we don't do skipping here:

• 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_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_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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ngl bestie, the whole "wait for phy init timed out" line under a function called auto load is giving copy-paste energy, but it's what the manpage says so I'm telling you exactly what it says 🍓

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and that's the page!! source path ./drivers/gpu/drm/amd/display/..., dated October 2026, and she's filed under dmub_srv_wait_for_auto_load(9) — ily, go read dmub_srv_wait_for_phy_init(9) next, mwah 💜🧚✨