dmub_srv_wait_for_phy_init(9)

💅 dmub_srv_wait_for_phy_init(9) — a Kernel API Manual moment

okay so bestie, this is dmub_srv_wait_for_phy_init(9) straight out of the Kernel API Manual, and it's literally just "wait for the PHY to be ready, but, like, with a timeout so you don't get stuck forever." tiny function, big main character energy. 🦋

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✨ NAME ✨

dmub_srv_wait_for_phy_init — Waits for DMUB PHY init to complete 💖

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🎀 SYNOPSIS 🎀

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

no cap, that's the whole signature. two things in, one status out. periodt. ✨

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🌸 ARGUMENTS 🌸

• dmub — the dmub service 🫶 like, the actual thing you're waiting on.
• timeout_us — the maximum number of microseconds to wait ⏳ (yes microseconds, she's precise)

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👑 DESCRIPTION 👑

Waits until the PHY has been initialized by the DMUB. 💅 The maximum wait time is given in microseconds to prevent spinning forever — because we are not doing the infinite-loop thing, that's giving toxic ex energy.

On ASICs without PHY init support this function will return immediately. 🏃‍♀️💨 so cute of her honestly, no waiting around where there's nothing to wait for.

ngl, this is the "text me when you're up" of kernel functions. except with a hard deadline and it actually respects it. 😭

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⭐ RETURN ⭐

• DMUB_STATUS_OK — success 🎉 ate, no crumbs
• DMUB_STATUS_TIMEOUT — wait for phy init timed out 💀 she waited the whole timeout_us and nothing happened
• DMUB_STATUS_INVALID — unspecified error 🙈 the vibe check failed and nobody knows why

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🌈 SEE ALSO 🌈

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_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_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)

like, that's the whole friend group right there. go say hi. 🫶💜

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and that's the page!! 🎀 sourced from ./drivers/gpu/drm/amd/display/..., dated October 2026, living in the Kernel API Manual — mwah, love that for us. stan a timeout that actually times out. 💅✨🔥