drm/i915/ehl: Enable DDI-D

EHL has four DDI's (DDI-A and DDI-D share combo PHY A).

Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190709183934.445-6-matthew.d.roper@intel.com
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index c2ed4bd..0286b97 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -15308,6 +15308,7 @@
 		intel_ddi_init(dev_priv, PORT_A);
 		intel_ddi_init(dev_priv, PORT_B);
 		intel_ddi_init(dev_priv, PORT_C);
+		intel_ddi_init(dev_priv, PORT_D);
 		icl_dsi_init(dev_priv);
 	} else if (INTEL_GEN(dev_priv) >= 11) {
 		intel_ddi_init(dev_priv, PORT_A);