drm_dp_downstream_is_tmds(9)

💖 drm_dp_downstream_is_tmds(9) 💖

okay bestie, welcome to the Kernel API Manual page for drm_dp_downstream_is_tmds, and it is literally here to answer one very specific question: is the downstream facing port TMDS? that's the assignment. no cap. 💅

---

✨ NAME ✨

drm_dp_downstream_is_tmds — is the downstream facing port TMDS?

like, yes, that's the whole name and the whole vibe. 🎀

---

🌸 SYNOPSIS 🌸

bool drm_dp_downstream_is_tmds (const u8 dpcd[DP_RECEIVER_CAP_SIZE] ,
       const u8 port_cap[4] , const struct drm_edid *drm_edid );

---

🎀 ARGUMENTS 🎀

• dpcd — DisplayPort configuration data. this is the DPCD bestie, main-character buffer energy.
• port_cap — port capabilities. it's giving "here are the port's little capabilities."
• drm_edid — EDID. the display's whole self-description moment. 🦋

---

⭐ RETURN ⭐

it returns whether the downstream facing port is TMDS (HDMI/DVI). that's the tea, that's the answer, periodt. 💅

---

🦋 SEE ALSO 🦋

the whole linked-page friend group, and yes i'm listing every single one because we do not skip lore:

• 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_powered(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_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)

---

source/version: ./drivers/gpu/drm/display · date: October 2026 · title: drm_dp_downstream_is_tmds(9) — mwah, love u, bye 💋✨