[SRU][R][PATCH 07/22] drm/i915/dp: Handle the RX_CAP_CHANGED HPD IRQ

[Werner Sembach]

From: Imre Deak <imre.deak at intel.com>

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 at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-6-imre.deak@intel.com
Signed-off-by: Werner Sembach <wse at tuxedocomputers.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 6c977cff4fd46..3ea750bba1366 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5370,7 +5370,7 @@ 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);
 
@@ -5383,6 +5383,9 @@ 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);
 
@@ -5695,6 +5698,9 @@ 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);
 
-- 
2.43.0