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drm/i915/dp: Handle the RX_CAP_CHANGED HPD IRQ

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Handle the RX_CAP_CHANGED IRQ, which a sink can use to indicate a DPRX
capability change without disconnecting and reconnecting itself (i.e.
through a short vs. long HPD pulse). Handle the IRQ by doing a full
connector detection.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-6-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-25 18:46:03 +02:00
parent 90b86782d4
commit e55791f5b7
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/i915/display/intel_dp.c
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@ -5491,7 +5491,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
drm_dbg_kms(display->drm, "DPRX ESI: %4ph\n", esi);
ack[3] |= esi[3] & (LINK_STATUS_CHANGED | DP_TUNNELING_IRQ);
ack[3] |= esi[3] & (RX_CAP_CHANGED | LINK_STATUS_CHANGED | DP_TUNNELING_IRQ);
intel_dp_mst_hpd_irq(intel_dp, esi, ack);
@ -5504,6 +5504,9 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
if (ack[1] & (DP_DOWN_REP_MSG_RDY | DP_UP_REQ_MSG_RDY))
drm_dp_mst_hpd_irq_send_new_request(&intel_dp->mst.mgr);
if (ack[3] & RX_CAP_CHANGED)
reprobe_needed = true;
if ((ack[3] & LINK_STATUS_CHANGED) || intel_dp->link.force_retrain)
intel_dp_check_link_state(intel_dp);
@ -5816,6 +5819,9 @@ static bool intel_dp_check_link_service_irq(struct intel_dp *intel_dp)
DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1)
return false;
if (val & RX_CAP_CHANGED)
reprobe_needed = true;
if (val & HDMI_LINK_STATUS_CHANGED)
intel_dp_handle_hdmi_link_status_change(intel_dp);