drm_dp_mst_...handle_event(9)

✨ drm_dp_mst_hpd_irq_handle_event 💅

okay bestie, welcome to the Kernel API Manual 🎀 — this is the page for drm_dp_mst_hpd_irq_handle_event, and it's lowkey the function that handles your MST hotplug IRQ events. let's get into it 🦋

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🌸 NAME 🌸

drm_dp_mst_hpd_irq_handle_event — MST hotplug IRQ handle MST event ✨ like, the function that deals with MST events when the hotplug interrupt comes knocking 🫶

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⭐ SYNOPSIS ⭐

int drm_dp_mst_hpd_irq_handle_event (struct drm_dp_mst_topology_mgr *mgr
, const u8 *esi , u8 *ack , bool *handled );

no cap, that's the whole signature 👑

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🎀 ARGUMENTS 🎀

• mgr — the manager you're notifying the IRQ for 💖 like, this is the topology manager in question
• esi — 4 bytes straight from SINK_COUNT_ESI 🌸 (yes, exactly 4, don't come at me with 3)
• ack — 4 bytes used to ack events, starting from SINK_COUNT_ESI ✨
• handled — whether the hpd interrupt was consumed or not 👀 (a lil bool so you know if it got ate)

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💜 DESCRIPTION 💜

so the driver literally calls this when it detects a HPD IRQ 🔥 — and it passes along the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0 with it. then the topology manager goes ahead and processes the sideband messages that came in, as indicated in that DEVICE_SERVICE_IRQ_VECTOR_ESI0, and it sets the corresponding flags that the Driver has to ack to the DP receiver later. periodt 💅

heads up bestie 🚨 — the driver shall also call drm_dp_mst_hpd_irq_send_new_request if the 'handled' is set after calling this function. the whole point is to try to kick off a new request in the queue if the previous message transaction is completed 🧚 not me reminding you twice, but like, do it 🙈

See also: drm_dp_mst_hpd_irq_send_new_request ⭐

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🌈 SEE ALSO 🌈

Kernel file ./drivers/gpu/drm/display/drm_dp_mst_topology.c — and the whole iconic friend group 💖:

• dp mst helper(9)
• Branch device and port refcounting(9)
• drm_dp_mst_get_mstb_malloc(9)
• drm_dp_mst_put_mstb_malloc(9)
• drm_dp_mst_get_port_malloc(9)
• drm_dp_mst_put_port_malloc(9)
• drm_dp_mst_topology_try_get_mstb(9)
• drm_dp_mst_topology_get_mstb(9)
• drm_dp_mst_topology_put_mstb(9)
• drm_dp_mst_topology_try_get_port(9)
• drm_dp_mst_topology_get_port(9)
• drm_dp_mst_topology_put_port(9)
• drm_dp_mst_dpcd_read(9)
• drm_dp_mst_dpcd_write(9)
• drm_dp_mst_connector_late_register(9)
• drm_dp_mst_connector_early_unregister(9)
• drm_dp_add_payload_part1(9)
• drm_dp_remove_payload_part1(9)
• drm_dp_remove_payload_part2(9)
• drm_dp_add_payload_part2(9)
• drm_dp_get_vc_payload_bw(9)
• drm_dp_read_mst_cap(9)
• drm_dp_mst_topology_mgr_set_mst(9)
• drm_dp_mst_topology_queue_probe(9)
• drm_dp_mst_topology_mgr_suspend(9)
• drm_dp_mst_topology_mgr_resume(9)
• drm_dp_mst_hpd_irq_send_new_request(9)
• drm_dp_mst_detect_port(9)
• drm_dp_mst_edid_read(9)
• drm_dp_mst_get_edid(9)
• drm_dp_atomic_find_time_slots(9)
• drm_dp_atomic_release_time_slots(9)
• drm_dp_mst_atomic_setup_commit(9)
• drm_dp_mst_atomic_wait_for_dependencies(9)
• drm_dp_mst_root_conn_atomic_check(9)
• drm_dp_mst_update_slots(9)
• drm_dp_check_act_status(9)
• drm_dp_calc_pbn_mode(9)
• drm_dp_mst_dump_topology(9)
• drm_dp_mst_port_downstream_of_parent(9)
• drm_dp_mst_add_affected_dsc_crtcs(9)
• drm_dp_mst_atomic_enable_dsc(9)
• drm_dp_mst_atomic_check_mgr(9)
• drm_dp_mst_atomic_check(9)
• drm_atomic_get_mst_topology_state(9)
• drm_atomic_get_old_mst_topology_state(9)
• drm_atomic_get_new_mst_topology_state(9)
• drm_dp_mst_topology_mgr_init(9)
• drm_dp_mst_topology_mgr_destroy(9)
• drm_dp_mst_register_i2c_bus(9)
• drm_dp_mst_unregister_i2c_bus(9)
• drm_dp_mst_is_virtual_dpcd(9)
• drm_dp_mst_aux_for_parent(9)
• drm_dp_mst_dsc_aux_for_port(9)

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and that's the whole page bestie, iykyk 🦋 this lil icon comes from ./drivers/gpu/drm/display, dated October 2026, and it's filed under drm_dp_mst_...handle_event(9) — mwah, go read the source, ily 💖✨👑