[Intel-gfx] [PATCH 05/12] drm/i915/skl: Fail the flip if no FB for WM calculation

[Mahesh Kumar]

From: "Kumar, Mahesh" <mahesh1.kumar at intel.com>

Fail the flip if no FB is present but plane_state is set as visible.
Above is not a valid combination so instead of continue fail the flip.

Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ab056952cfa4..f494af358874 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4408,7 +4408,8 @@ skl_compute_wm_level(const struct drm_i915_private *dev_priv,
 	if (!intel_pstate)
 		intel_pstate = to_intel_plane_state(plane->state);
 
-	WARN_ON(!intel_pstate->base.fb);
+	if (WARN_ON(!intel_pstate->base.fb))
+		return -EINVAL;
 
 	ddb_blocks = skl_ddb_entry_size(&ddb->plane[pipe][intel_plane->id]);
 
-- 
2.11.0