drm/i915: Handle SDEISR according to PCH rather than platform

The South Display is part of the PCH so we should technically be basing
our port detection logic off the PCH in use rather than the platform
generation.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191127221314.575575-1-matthew.d.roper@intel.com

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

@@ -5498,7 +5498,7 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
 	return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(port);
 }
 
-static bool icl_digital_port_connected(struct intel_encoder *encoder)
+static bool icp_digital_port_connected(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
@@ -5536,9 +5536,9 @@ static bool __intel_digital_port_connected(struct intel_encoder *encoder)
 			return g4x_digital_port_connected(encoder);
 	}
 
-	if (INTEL_GEN(dev_priv) >= 11)
-		return icl_digital_port_connected(encoder);
-	else if (IS_GEN(dev_priv, 10) || IS_GEN9_BC(dev_priv))
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
+		return icp_digital_port_connected(encoder);
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
 		return spt_digital_port_connected(encoder);
 	else if (IS_GEN9_LP(dev_priv))
 		return bxt_digital_port_connected(encoder);