drm/exynos: atomic check only enabled crtc states
Since atomic check is called also for disabled crtcs it should skip mode checking as it can be uninitialized. The patch fixes it. Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com> Suggested-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Tested-by: NJavier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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