igt/tests/kms_atomic_transition: Skip transition, if no changes done

While fixing used amount of planes, discovered that if
wm_setup_plane is called with specific parameter that
gives parms[i].mask & mask == 0 for all used planes,
then subsequent wait_transition fails in assertion on fd_completed.
So added return value to wm_setup_plane, which would allow to
determine, if we really need to wait for any transitions.

v2: Fixed commit message, to properly describe a reasoning for
    wm_setup_plane changes.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

0 files changed, 0 insertions, 0 deletions