usb4_dp_port_set_cm_id(9)

💅 usb4_dp_port_set_cm_id — the Kernel API Manual ✨

okay so bestie, welcome to the usb4_dp_port_set_cm_id(9) page from the Kernel API Manual 🎀 this one is short, sweet, and honestly iconic — we're giving a DisplayPort IN adapter its CM ID, no cap.

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🌸 NAME 🌸

usb4_dp_port_set_cm_id — assign the CM ID to the DP IN adapter 💅

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✨ SYNOPSIS ✨

int usb4_dp_port_set_cm_id (struct tb_port *port , int cm_id );

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🦋 ARGUMENTS 🦋

• port — the DP IN adapter we're working with 🫶
• cm_id — the CM ID you're assigning to it ✨

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💖 DESCRIPTION 💖

so here's the whole vibe: it sets the CM ID for the port. that's it, that's the function. lowkey elegant, honestly. 🔥

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🌈 RETURN 🌈

• 0 — on success, slay 💅✨
• -EOPNOTSUPP — if the port doesn't support this, bestie, it's just not that girl 🙈
• Negative errno — another error happened, and yeah, that's a thing 😭

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💜 SEE ALSO 💜

Kernel file: ./drivers/thunderbolt/usb4.c — and here's the whole friend group, fr fr:

• usb4_switch_check_wakes(9)
• usb4_switch_setup(9)
• usb4_switch_configuration_valid(9)
• usb4_switch_read_uid(9)
• usb4_switch_drom_read(9)
• usb4_switch_lane_bonding_possible(9)
• usb4_switch_set_wake(9)
• usb4_switch_set_sleep(9)
• usb4_switch_nvm_sector_size(9)
• usb4_switch_nvm_read(9)
• usb4_switch_nvm_set_offset(9)
• usb4_switch_nvm_write(9)
• usb4_switch_nvm_authenticate(9)
• usb4_switch_nvm_authenticate_status(9)
• usb4_switch_credits_init(9)
• usb4_switch_query_dp_resource(9)
• usb4_switch_alloc_dp_resource(9)
• usb4_switch_dealloc_dp_resource(9)
• usb4_port_index(9)
• usb4_switch_map_pcie_down(9)
• usb4_switch_map_usb3_down(9)
• usb4_switch_add_ports(9)
• usb4_switch_remove_ports(9)
• usb4_port_unlock(9)
• usb4_port_hotplug_enable(9)
• usb4_port_reset(9)
• usb4_port_configure(9)
• usb4_port_unconfigure(9)
• usb4_port_configure_xdomain(9)
• usb4_port_unconfigure_xdomain(9)
• usb4_port_sb_read(9)
• usb4_port_sb_write(9)
• usb4_port_router_offline(9)
• usb4_port_router_online(9)
• usb4_port_enumerate_retimers(9)
• usb4_port_clx_supported(9)
• usb4_port_asym_supported(9)
• usb4_port_asym_set_link_width(9)
• usb4_port_asym_start(9)
• usb4_port_margining_caps(9)
• usb4_port_hw_margin(9)
• usb4_port_sw_margin(9)
• usb4_port_sw_margin_errors(9)
• usb4_port_retimer_set_inbound_sbtx(9)
• usb4_port_retimer_unset_inbound_sbtx(9)
• usb4_port_retimer_is_last(9)
• usb4_port_retimer_is_cable(9)
• usb4_port_retimer_nvm_sector_size(9)
• usb4_port_retimer_nvm_set_offset(9)
• usb4_port_retimer_nvm_write(9)
• usb4_port_retimer_nvm_authenticate(9)
• usb4_port_retimer_nvm_authenticate_status(9)
• usb4_port_retimer_nvm_read(9)
• usb4_usb3_port_max_link_rate(9)
• usb4_usb3_port_allocated_bandwidth(9)
• usb4_usb3_port_allocate_bandwidth(9)
• usb4_usb3_port_release_bandwidth(9)
• usb4_dp_port_bandwidth_mode_supported(9)
• usb4_dp_port_bandwidth_mode_enabled(9)
• usb4_dp_port_set_cm_bandwidth_mode_supported(9)
• usb4_dp_port_group_id(9)
• usb4_dp_port_set_group_id(9)
• usb4_dp_port_nrd(9)
• usb4_dp_port_set_nrd(9)
• usb4_dp_port_granularity(9)
• usb4_dp_port_set_granularity(9)
• usb4_dp_port_set_estimated_bandwidth(9)
• usb4_dp_port_allocated_bandwidth(9)
• usb4_dp_port_allocate_bandwidth(9)
• usb4_dp_port_requested_bandwidth(9)
• usb4_pci_port_set_ext_encapsulation(9)
• usb4_pci_port_ltssm_state(9)

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ngl bestie, read the whole list or none of it — it's giving completionist energy and we respect that 👑

okay that's the page!! this masterpiece lives in ./drivers/thunderbolt, version October 2026 🗓️✨ go forth and assign those CM IDs, you absolute icon 💅💖🦋