Fixes the following error when fastset is enabled, caught by CI:

[drm:ilk_validate_wm_level.part.8 [i915]] Sprite WM0 too large 56 (max 0)
[drm:ilk_validate_pipe_wm [i915]] LP0 watermark invalid
[drm:intel_crtc_atomic_check [i915]] No valid intermediate pipe watermarks are 
possible

Triggered on debugfs_test.read_all_entries, but could have been any igt
test depending on ordering.

Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a01ec068eba8..05dbeb430e21 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3380,6 +3380,7 @@ static int ilk_compute_intermediate_wm(struct drm_device 
*dev,
         */
        *a = newstate->wm.ilk.optimal;
        if (!newstate->base.active || intel_state->skip_intermediate_wm ||
+           oldstate->base.mode.private_flags & I915_MODE_FLAG_INHERITED ||
            drm_atomic_crtc_needs_modeset(&newstate->base))
                return 0;
 
-- 
2.14.1

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