[Intel-gfx] [PATCHv3] drm/i915/fbc: Disable FBC when VT-d is enabled

[Arun R Murthy <arun.r.murthy@intel.com>]

The WaFbcTurnOffFbcWhenHyperVisorIsUsed is applicable for SKL, BXT and
KBL.

Bspec: 0852

v2: Updated commit msg and corrected Bspec format(Jani N)
v3: Updated the stepping information

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index b5ee5ea0d010..7c06ad454a7d 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1652,9 +1652,10 @@ static int intel_sanitize_fbc_option(struct drm_i915_private *i915)
 
 static bool need_fbc_vtd_wa(struct drm_i915_private *i915)
 {
-	/* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
+	/* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt,kbl */
 	if (i915_vtd_active(i915) &&
-	    (IS_SKYLAKE(i915) || IS_BROXTON(i915))) {
+			(IS_SKYLAKE(i915) || IS_BROXTON(i915) ||
+			IS_KBL_DISPLAY_STEP(i915, STEP_A0, STEP_B0))) {
 		drm_info(&i915->drm,
 			 "Disabling framebuffer compression (FBC) to prevent screen flicker with VT-d enabled\n");
 		return true;
-- 
2.25.1