drm_dp_dpcd_set_powered(9)

💖 drm_dp_dpcd_set_powered(9) 💖

ok so first things first — this page lives in the Kernel API Manual, and it's all about drm_dp_dpcd_set_powered, aka "tell the kernel whether the DP device is powered or not." that's the whole vibe. bestie, it's a tiny function and honestly it slays at exactly one job. let's get into it ✨

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✨ SYNOPSIS ✨

void drm_dp_dpcd_set_powered (struct drm_dp_aux *aux , bool powered );

like, look at her. two arguments. no drama. main character energy fr fr 🎀

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🫶 ARGUMENTS 🫶

• aux — the DisplayPort AUX channel. and here's the cute part: for convenience it's totally OK to pass NULL here, and the function will just be a no-op. nothing happens. it's giving "gracefully ignores you" 💅
• powered — true if powered, false if not. that's it, that's the boolean 🦋

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🌸 DESCRIPTION 🌸

ok so picture this: the endpoint device on the DP AUX bus is known to be powered down. if you know that, you can call this function, and then future transfers will fail immediately instead of needing to time out. the way that saves you from sitting there waiting for a timeout that was never gonna be cute — obsessed 😭

and if this function is never called? no worries, a device defaults to being powered. lowkey the chillest default ever ⭐

ngl, this one's a "tell the kernel what's up so it doesn't waste your time" situation. no cap 🧚

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👑 SEE ALSO 👑

this list is long long, bestie — but every single one is here, periodt 💜

Kernel file ./drivers/gpu/drm/display/drm_dp_helper.c dp helpers(9), drm_dp_phy_name(9), drm_dp_lttpr_wake_timeout_setup(9), dp helpers(9), drm_dp_dpcd_probe(9), drm_dp_dpcd_set_probe(9), drm_dp_dpcd_read(9), drm_dp_dpcd_write(9), drm_dp_dpcd_read_link_status(9), drm_dp_dpcd_read_phy_link_status(9), drm_dp_link_power_up(9), drm_dp_link_power_down(9), drm_dp_dpcd_write_payload(9), drm_dp_dpcd_clear_payload(9), drm_dp_dpcd_poll_act_handled(9), drm_dp_downstream_is_type(9), drm_dp_downstream_is_tmds(9), drm_dp_send_real_edid_checksum(9), drm_dp_read_dpcd_caps(9), drm_dp_read_downstream_info(9), drm_dp_downstream_max_dotclock(9), drm_dp_downstream_max_tmds_clock(9), drm_dp_downstream_min_tmds_clock(9), drm_dp_downstream_max_bpc(9), drm_dp_downstream_420_passthrough(9), drm_dp_downstream_444_to_420_conversion(9), drm_dp_downstream_rgb_to_ycbcr_conversion(9), drm_dp_downstream_mode(9), drm_dp_downstream_id(9), drm_dp_downstream_debug(9), drm_dp_subconnector_type(9), drm_dp_set_subconnector_property(9), drm_dp_read_sink_count_cap(9), drm_dp_read_sink_count(9), drm_dp_remote_aux_init(9), drm_dp_aux_init(9), drm_dp_aux_register(9), drm_dp_aux_unregister(9), drm_dp_psr_setup_time(9), drm_dp_start_crc(9), drm_dp_stop_crc(9), drm_dp_read_desc(9), drm_dp_dump_lttpr_desc(9), drm_dp_dsc_sink_bpp_incr(9), drm_dp_dsc_slice_count_to_mask(9), drm_dp_dsc_sink_slice_count_mask(9), drm_dp_dsc_sink_max_slice_count(9), drm_dp_dsc_sink_line_buf_depth(9), drm_dp_dsc_sink_supported_input_bpcs(9), drm_dp_dsc_sink_max_slice_throughput(9), drm_dp_dsc_branch_max_overall_throughput(9), drm_dp_dsc_branch_max_line_width(9), drm_dp_read_lttpr_common_caps(9), drm_dp_read_lttpr_phy_caps(9), drm_dp_lttpr_count(9), drm_dp_lttpr_max_link_rate(9), drm_dp_lttpr_set_transparent_mode(9), drm_dp_lttpr_init(9), drm_dp_lttpr_max_lane_count(9), drm_dp_lttpr_voltage_swing_level_3_supported(9), drm_dp_lttpr_pre_emphasis_level_3_supported(9), drm_dp_get_phy_test_pattern(9), drm_dp_set_phy_test_pattern(9), drm_dp_as_sdp_supported(9), drm_dp_vsc_sdp_supported(9), drm_dp_vsc_sdp_pack(9), drm_dp_get_pcon_max_frl_bw(9), drm_dp_pcon_frl_prepare(9), drm_dp_pcon_is_frl_ready(9), drm_dp_pcon_frl_configure_1(9), drm_dp_pcon_frl_configure_2(9), drm_dp_pcon_reset_frl_config(9), drm_dp_pcon_frl_enable(9), drm_dp_pcon_hdmi_link_active(9), drm_dp_pcon_hdmi_link_mode(9), drm_dp_pcon_hdmi_frl_link_error_count(9), drm_dp_pcon_pps_default(9), drm_dp_pcon_pps_override_buf(9), drm_edp_backlight_set_level(9), drm_edp_backlight_enable(9), drm_edp_backlight_disable(9), drm_edp_backlight_init(9), drm_panel_dp_aux_backlight(9), drm_dp_link_symbol_cycles(9), drm_dp_bw_overhead(9), drm_dp_bw_channel_coding_efficiency(9), drm_dp_max_dprx_data_rate(9)

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k that's the whole page, bestie. go forth and power things correctly 💪🌈

and finally, the cute lil sign-off: this one comes from the source at ./drivers/gpu/drm/display, dated October 2026, and the page itself is drm_dp_dpcd_set_powered(9) 🍓✨ bye ily! 💖