drm/i915: Consult the registered encoders for the ICL combo PHY w/a

Display WA #1178 calls us to tweak some magic bits when doing AUX
to an external combo PHY port. Instead of looking to see if the VBT
has declared such a port (which could in theory even alias with a
declared eDP port on the same PHY) just check the real situation
based on the registered encoders.

The only slight chicken vs. egg situation here is during output
probing. But typically we'd register the eDP ports first and so
once we get to probe anything external on the combo PHY we have
already determined if it's eDP or not.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230208015508.24824-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -391,6 +391,19 @@ static void hsw_power_well_disable(struct drm_i915_private *dev_priv,
 	hsw_wait_for_power_well_disable(dev_priv, power_well);
 }
 
+static bool intel_port_is_edp(struct drm_i915_private *i915, enum port port)
+{
+	struct intel_encoder *encoder;
+
+	for_each_intel_encoder(&i915->drm, encoder) {
+		if (encoder->type == INTEL_OUTPUT_EDP &&
+		    encoder->port == port)
+			return true;
+	}
+
+	return false;
+}
+
 static void
 icl_combo_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
 				    struct i915_power_well *power_well)
@@ -416,7 +429,7 @@ icl_combo_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
 
 	/* Display WA #1178: icl */
 	if (pw_idx >= ICL_PW_CTL_IDX_AUX_A && pw_idx <= ICL_PW_CTL_IDX_AUX_B &&
-	    !intel_bios_is_port_edp(dev_priv, (enum port)phy)) {
+	    !intel_port_is_edp(dev_priv, (enum port)phy)) {
 		val = intel_de_read(dev_priv, ICL_AUX_ANAOVRD1(pw_idx));
 		val |= ICL_AUX_ANAOVRD1_ENABLE | ICL_AUX_ANAOVRD1_LDO_BYPASS;
 		intel_de_write(dev_priv, ICL_AUX_ANAOVRD1(pw_idx), val);