From: Imre Deak Date: Wed, 25 Feb 2026 16:46:03 +0000 (+0200) Subject: drm/i915/dp: Handle the RX_CAP_CHANGED HPD IRQ X-Git-Tag: v7.1-rc1~167^2~24^2~69 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e55791f5b78d1e2ecba107564e2c7370b8272974;p=thirdparty%2Flinux.git 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: Luca Coelho Signed-off-by: Imre Deak Link: https://patch.msgid.link/20260225164618.1261368-6-imre.deak@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 2e7a4df48afa7..966e652e38d2d 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -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);