1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 6a7ad3ed1463..3836a1c79714 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -1230,12 +1230,29 @@ static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv)
         if (i915.enable_fbc >= 0)
                 return !!i915.enable_fbc;
 
+        if (!HAS_FBC(dev_priv))
+                return 0;
+
         if (IS_BROADWELL(dev_priv))
                 return 1;
 
         return 0;
 }
 
+static bool need_fbc_vtd_wa(struct drm_i915_private *dev_priv)
+{
+#ifdef CONFIG_INTEL_IOMMU
+        /* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
+        if (intel_iommu_gfx_mapped &&
+            (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))) {
+                DRM_INFO("Disabling framebuffer compression (FBC) to prevent screen flicker with VT-d enabled\n");
+                return true;
+        }
+#endif
+
+        return false;
+}
+
 /**
  * intel_fbc_init - Initialize FBC
  * @dev_priv: the i915 device
@@ -1253,6 +1270,9 @@ void intel_fbc_init(struct drm_i915_private *dev_priv)
         fbc->active = false;
         fbc->work.scheduled = false;
 
+        if (need_fbc_vtd_wa(dev_priv))
+                mkwrite_device_info(dev_priv)->has_fbc = false;
+
         i915.enable_fbc = intel_sanitize_fbc_option(dev_priv);
         DRM_DEBUG_KMS("Sanitized enable_fbc value: %d\n", i915.enable_fbc);