Both VT-d and FBC enabled that caused display flicker
issue very randomly. According to sighting report,
it recommend to disable FBC to workaround this issue.
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: Jani Nikula <jani.nik...@intel.com>
Cc: William Tseng <william.ts...@intel.com>
Signed-off-by: Lee Shawn C <shawn.c....@intel.com>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c
b/drivers/gpu/drm/i915/display/intel_fbc.c
index 135f5e8a4d70..327af428d73f 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1443,7 +1443,8 @@ static bool need_fbc_vtd_wa(struct drm_i915_private
*dev_priv)
{
/* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
if (intel_vtd_active() &&
- (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv))) {
+ (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv) ||
+ IS_COMETLAKE(dev_priv))) {
drm_info(&dev_priv->drm,
"Disabling framebuffer compression (FBC) to prevent
screen flicker with VT-d enabled\n");
return true;
--
2.17.1
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