1 files changed, 22 insertions, 17 deletions

diff --git a/drivers/gpu/drm/i915/intel_pch.c b/drivers/gpu/drm/i915/intel_pch.c
index f31c0dabd0cc..ecaf314d60b6 100644
--- a/drivers/gpu/drm/i915/intel_pch.c
+++ b/drivers/gpu/drm/i915/intel_pch.c
@@ -143,8 +143,9 @@ static bool intel_is_virt_pch(unsigned short id,
 		 sdevice == PCI_SUBDEVICE_ID_QEMU));
 }
 
-static unsigned short
-intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
+static void
+intel_virt_detect_pch(const struct drm_i915_private *dev_priv,
+		      unsigned short *pch_id, enum intel_pch *pch_type)
 {
 	unsigned short id = 0;
 
@@ -181,12 +182,21 @@ intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
 	else
 		drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
 
-	return id;
+	*pch_type = intel_pch_type(dev_priv, id);
+
+	/* Sanity check virtual PCH id */
+	if (drm_WARN_ON(&dev_priv->drm,
+			id && *pch_type == PCH_NONE))
+		id = 0;
+
+	*pch_id = id;
 }
 
 void intel_detect_pch(struct drm_i915_private *dev_priv)
 {
 	struct pci_dev *pch = NULL;
+	unsigned short id;
+	enum intel_pch pch_type;
 
 	/* DG1 has south engine display on the same PCI device */
 	if (IS_DG1(dev_priv)) {
@@ -206,9 +216,6 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
 	 * of only checking the first one.
 	 */
 	while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
-		unsigned short id;
-		enum intel_pch pch_type;
-
 		if (pch->vendor != PCI_VENDOR_ID_INTEL)
 			continue;
 
@@ -221,14 +228,7 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
 			break;
 		} else if (intel_is_virt_pch(id, pch->subsystem_vendor,
 					     pch->subsystem_device)) {
-			id = intel_virt_detect_pch(dev_priv);
-			pch_type = intel_pch_type(dev_priv, id);
-
-			/* Sanity check virtual PCH id */
-			if (drm_WARN_ON(&dev_priv->drm,
-					id && pch_type == PCH_NONE))
-				id = 0;
-
+			intel_virt_detect_pch(dev_priv, &id, &pch_type);
 			dev_priv->pch_type = pch_type;
 			dev_priv->pch_id = id;
 			break;
@@ -244,10 +244,15 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
 			    "Display disabled, reverting to NOP PCH\n");
 		dev_priv->pch_type = PCH_NOP;
 		dev_priv->pch_id = 0;
+	} else if (!pch) {
+		if (run_as_guest() && HAS_DISPLAY(dev_priv)) {
+			intel_virt_detect_pch(dev_priv, &id, &pch_type);
+			dev_priv->pch_type = pch_type;
+			dev_priv->pch_id = id;
+		} else {
+			drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
+		}
 	}
 
-	if (!pch)
-		drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
-
 	pci_dev_put(pch);
 }