Now that this code is part of the compute stage we can return -EINVAL
to prevent the modeset instead of giving a WARN and trying anyway.

Reported-by: Lyude <cp...@redhat.com>
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9edc8ce..6394db7 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3589,11 +3589,11 @@ static int skl_compute_plane_wm(const struct 
drm_i915_private *dev_priv,
                case 2:
                        y_min_scanlines = 8;
                        break;
-               default:
-                       WARN(1, "Unsupported pixel depth for rotation");
                case 4:
                        y_min_scanlines = 4;
                        break;
+               default:
+                       return -EINVAL;
                }
        } else {
                y_min_scanlines = 4;
-- 
2.7.4

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