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.
v2: Specific this change for CML U series device.
Using IS_CML_ULT() instead of IS_COMETLAKE().
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: William Tseng <william.tseng@xxxxxxxxx>
Signed-off-by: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 4 +++-
1 file changed, 3 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..c99c4c84a0ed 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1443,7 +1443,9 @@ 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_CML_ULT(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
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
