drm/i915: Re-order if/else ladder in intel_detect_pch()

Follow the convention of checking the last platform first and reword the
comment to convey there are more platforms than just DG1.
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919192128.2045154-5-lucas.demarchi@intel.com

drivers/gpu/drm/i915/soc/intel_pch.c

@@ -218,13 +218,16 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
 	unsigned short id;
 	enum intel_pch pch_type;
 
-	/* DG1 has south engine display on the same PCI device */
-	if (IS_DG1(dev_priv)) {
-		dev_priv->pch_type = PCH_DG1;
-		return;
-	} else if (IS_DG2(dev_priv)) {
+	/*
+	 * South display engine on the same PCI device: just assign the fake
+	 * PCH.
+	 */
+	if (IS_DG2(dev_priv)) {
 		dev_priv->pch_type = PCH_DG2;
 		return;
+	} else if (IS_DG1(dev_priv)) {
+		dev_priv->pch_type = PCH_DG1;
+		return;
 	}
 
 	/*