STRUCT AUX_TRANSACTION_PARAMETERS(9)

💅 struct aux_transaction_parameters(9) — Kernel API Manual

Hey bestie, welcome to the Kernel API Manual page for struct aux_transaction_parameters — yes that's the whole name, it's a long one, we deal. This is the glow-up of the manpage, the vibes are immaculate, and the facts are all still here, no cap. 🎀

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✨ NAME ✨

struct aux_transaction_parameters — DP AUX request transaction data 🦋

Like, that's the whole personality: it's the little struct that carries the data for a DP AUX request transaction. Main character energy for a struct, honestly.

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🌸 SYNOPSIS 🌸

Here's the whole fit, every field exactly as it appears, don't touch a single character:

struct aux_transaction_parameters {
    uint8_t is_i2c_over_aux;
    uint8_t action;
    uint8_t length;
    uint8_t reserved;
    uint32_t address;
    uint8_t data[16];
 };

The way it's laid out? uint8_t little cuties up top, then a uint32_t address holding it down in the middle, then a uint8_t data[16] array closing the whole thing out. Obsessed with the structure. 💜

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🫶 Members 🫶

Okay so real talk — this section is literally empty in the original page. No per-member blurbs, no little description next to each field, nada. The members are the ones you see in the synopsis above:

• is_i2c_over_aux — a uint8_t, sitting right up top.
• action — a uint8_t.
• length — a uint8_t.
• reserved — a uint8_t, reserved, living its reserved little life.
• address — a uint32_t, the one wide boi of the group.
• data[16] — a uint8_t array with 16 elements.

No member descriptions were given on this page, so I'm not gonna make any up — that's not the vibe. What you see is what's documented. 🙈

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🔥 SEE ALSO 🔥

So this struct runs with a huge friend group. Lowkey the biggest friend group in the dmub cinematic universe. All of these, exactly as named (and yes, that's the kernel file ./drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h holding it all down):

• union dmub_addr(9)
• struct dmub_cursor_offload_pipe_data_dcn30_v1(9)
• struct dmub_cursor_offload_pipe_data_dcn401_v1(9)
• struct dmub_cursor_offload_pipe_data_dcn60_v1(9)
• struct dmub_cursor_offload_pipe_data_v1(9)
• struct dmub_cursor_offload_payload_data_v1(9)
• struct dmub_cursor_offload_stream_v1(9)
• struct dmub_cursor_offload_v1(9)
• union dmub_fw_meta_feature_bits(9)
• struct dmub_fw_meta_info(9)
• union dmub_fw_meta(9)
• struct dmcub_trace_buf_entry(9)
• union dmub_fw_boot_status(9)
• enum dmub_fw_boot_status_bit(9)
• enum dmub_cursor_offload_comand_type(9)
• union dmub_fw_boot_options(9)
• enum dmub_shared_state_feature_id(9)
• struct dmub_shared_state_ips_fw(9)
• struct dmub_shared_state_ips_driver(9)
• struct dmub_shared_state_cursor_offload_v1(9)
• struct dmub_shared_state_feature_block(9)
• union dmub_gpint_data_register(9)
• enum dmub_out_cmd_type(9)
• struct dmub_cmd_header(9)
• struct dmub_rb_cmd_common(9)
• struct dmub_cmd_PLAT_54186_wa(9)
• struct dmub_rb_cmd_PLAT_54186_wa(9)
• enum dmub_cmd_mall_type(9)
• struct dmub_rb_cmd_mall(9)
• enum dmub_cmd_cab_type(9)
• struct dmub_rb_cmd_cab_for_ss(9)
• enum dmub_fams2_allow_delay_check_mode(9)
• enum dmub_cmd_idle_opt_type(9)
• struct dmub_rb_cmd_idle_opt_dcn_restore(9)
• struct dmub_dcn_notify_idle_cntl_data(9)
• struct dmub_rb_cmd_idle_opt_dcn_notify_idle(9)
• enum dmub_idle_opt_dc_power_state(9)
• struct dmub_idle_opt_set_dc_power_state_data(9)
• struct dmub_rb_cmd_idle_opt_set_dc_power_state(9)
• struct dmub_clocks(9)
• enum dmub_cmd_clk_mgr_type(9)
• struct dmub_rb_cmd_clk_mgr_notify_clocks(9)
• struct dmub_cmd_digx_encoder_control_data(9)
• struct dmub_rb_cmd_digx_encoder_control(9)
• struct dmub_cmd_set_pixel_clock_data(9)
• struct dmub_cmd_enable_disp_power_gating_data(9)
• struct dmub_rb_cmd_enable_disp_power_gating(9)
• struct dmub_dig_transmitter_control_data_v1_7(9)
• union dmub_cmd_dig1_transmitter_control_data(9)
• struct dmub_rb_cmd_dig1_transmitter_control(9)
• struct dmub_rb_cmd_domain_control_data(9)
• struct dmub_rb_cmd_domain_control(9)
• struct dmub_rb_cmd_dpphy_init(9)
• enum dp_aux_request_action(9)
• enum aux_return_code_type(9)
• enum aux_channel_type(9)
• struct dmub_rb_cmd_hpd_sense_notify(9)
• enum dmub_phy_fsm_state(9)
• enum dmub_abm_ace_curve_type(9)
• enum dmub_abm_histogram_type(9)
• enum dmub_cmd_panel_cntl_type(9)
• struct dmub_cmd_panel_cntl_data(9)
• struct dmub_rb_cmd_panel_cntl(9)
• struct dmub_cmd_cable_id_input(9)
• struct dmub_cmd_cursor_offload_init_data(9)
• struct dmub_rb_cmd_cursor_offload_init(9)
• struct dmub_cmd_cursor_offload_stream_data(9)
• struct dmub_rb_cmd_cursor_offload_stream_cntl(9)
• union dmub_rb_cmd(9)
• union dmub_rb_out_cmd(9)
• struct dmub_rb_init_params(9)
• struct dmub_rb(9)

That's, like, the entire dmub friend group chat. If you're reading one of these, you're in good company. 💀✨

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🧚 Sign-off 🧚

Okay that's the page bestie!! Go read the source, it's literally in ./drivers/gpu/drm/amd/display/... — and the version/date stamp on this whole thing is October 2026, so jot that down. 🍓 Slay, bye!! 💖👑🌈