3 files changed, 48 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d92ec1201c32..3526ccdea1b5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3457,6 +3457,7 @@ extern int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
 					 bool enable);
 extern int intel_opregion_notify_adapter(struct drm_device *dev,
 					 pci_power_t state);
+extern int intel_opregion_get_panel_type(struct drm_device *dev);
 #else
 static inline int intel_opregion_setup(struct drm_device *dev) { return 0; }
 static inline void intel_opregion_init(struct drm_device *dev) { return; }
@@ -3472,6 +3473,10 @@ intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state)
 {
 	return 0;
 }
+static inline int intel_opregion_get_panel_type(struct drm_device *dev)
+{
+	return -ENODEV;
+}
 #endif
 
 /* intel_acpi.c */
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index d595ca30a7e1..e72dd9a8d6bf 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -205,19 +205,29 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 	struct drm_display_mode *panel_fixed_mode;
 	int panel_type;
 	int drrs_mode;
+	int ret;
 
 	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 	if (!lvds_options)
 		return;
 
 	dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
-	if (lvds_options->panel_type > 0xf) {
-		DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
-			      lvds_options->panel_type);
-		return;
+
+	ret = intel_opregion_get_panel_type(dev_priv->dev);
+	if (ret >= 0) {
+		WARN_ON(ret > 0xf);
+		panel_type = ret;
+		DRM_DEBUG_KMS("Panel type: %d (OpRegion)\n", panel_type);
+	} else {
+		if (lvds_options->panel_type > 0xf) {
+			DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
+				      lvds_options->panel_type);
+			return;
+		}
+		panel_type = lvds_options->panel_type;
+		DRM_DEBUG_KMS("Panel type: %d (VBT)\n", panel_type);
 	}
 
-	panel_type = lvds_options->panel_type;
 	dev_priv->vbt.panel_type = panel_type;
 
 	drrs_mode = (lvds_options->dps_panel_type_bits
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index c15718b4862a..d3c4945a0e36 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -1024,3 +1024,31 @@ err_out:
 	memunmap(base);
 	return err;
 }
+
+int
+intel_opregion_get_panel_type(struct drm_device *dev)
+{
+	u32 panel_details;
+	int ret;
+
+	ret = swsci(dev, SWSCI_GBDA_PANEL_DETAILS, 0x0, &panel_details);
+	if (ret) {
+		DRM_DEBUG_KMS("Failed to get panel details from OpRegion (%d)\n",
+			      ret);
+		return ret;
+	}
+
+	ret = (panel_details >> 8) & 0xff;
+	if (ret > 0x10) {
+		DRM_DEBUG_KMS("Invalid OpRegion panel type 0x%x\n", ret);
+		return -EINVAL;
+	}
+
+	/* fall back to VBT panel type? */
+	if (ret == 0x0) {
+		DRM_DEBUG_KMS("No panel type in OpRegion\n");
+		return -ENODEV;
+	}
+
+	return ret - 1;
+}