Commit e55791f5 authored by Imre Deak's avatar Imre Deak
Browse files

drm/i915/dp: Handle the RX_CAP_CHANGED HPD IRQ 



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: default avatarLuca Coelho <luciano.coelho@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-6-imre.deak@intel.com
parent 90b86782

drivers/gpu/drm/i915/display/intel_dp.c

+7 −1
Original line number Diff line number Diff line
@@ -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);