drm/i915/skl: Fail the flip if no FB for WM calculation
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@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170517115831.13830-6-mahesh1.kumar@intel.com
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