dmub_srv_hw_reset(9)

💜 dmub_srv_hw_reset(9) 💜

okay bestie, so this is a page straight out of the Kernel API Manual (that's the manual name, not me being dramatic) — and honestly? it's a short one, but it's a load-bearing one. we're talking about dmub_srv_hw_reset up in here. no cap, you need this one in your life before you go tearing stuff down. 🫶

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✨ NAME ✨

dmub_srv_hw_reset — puts the DMUB hardware in reset state if initialized

like, if initialized. that "if" is doing a lot of work. remember it. 💅

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🌸 SYNOPSIS 🌸

enum dmub_status dmub_srv_hw_reset (struct dmub_srv *dmub );

that's it. one argument. one return. clean. iconic. ✨

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🎀 ARGUMENTS 🎀

• dmub — the dmub service, literally the whole point of this function. you hand it over, it knows what to do.

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🦋 DESCRIPTION 🦋

okay so here's the situation, bestie. before you go destroying the DMUB service or releasing the backing framebuffer memory, you gotta put the DMCUB into reset first. that's not optional, that's not a suggestion, that's just the order of operations. please do not skip the reset. 🙈

and the good news? it's reversible!! a subsequent call to dmub_srv_hw_init will re-enable the DMCUB. so it's giving "catch you later" not "gone forever". glow-up on the way back. 🔥

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⭐ RETURN ⭐

• DMUB_STATUS_OK — success, we ate, the reset happened 💅
• DMUB_STATUS_INVALID — unspecified error, lowkey a mystery, it's giving "idk what went wrong but something did" 😭

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🌈 SEE ALSO 🌈

bestie, buckle up, this list is long — but every single one of these is a real one and they're all right here:

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_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)

like I said. long. but you got this. 🧚

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kay that's the whole page bestie!! this little gem lives at ./drivers/gpu/drm/amd/display/... (the path got a lil truncated, iykyk) and it's dated October 2026 — marking it in the calendar fr fr. source: the Kernel API Manual, the one and only. mwah 💖 go reset some hardware responsibly, periodt. 👑