drm/i915: Ignore panel type from OpRegion on SKL

[karo-tx-linux.git] / drivers / gpu / drm / i915 / intel_opregion.c

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index c27d5eb063d0b21f8774cd786c7c40151b40471b..adca262d591ac02c46577ee05fa6741741433d41 100644 (file)
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -1072,5 +1072,16 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
                return -ENODEV;
        }
 
+       /*
+        * FIXME On Dell XPS 13 9350 the OpRegion panel type (0) gives us
+        * low vswing for eDP, whereas the VBT panel type (2) gives us normal
+        * vswing instead. Low vswing results in some display flickers, so
+        * let's simply ignore the OpRegion panel type on SKL for now.
+        */
+       if (IS_SKYLAKE(dev_priv)) {
+               DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1);
+               return -ENODEV;
+       }
+
        return ret - 1;
 }