drm/exynos/mixer: replace MXR_INT_EN register cache with flag
Driver uses only VSYNC interrupts, so we need to cache VSYNC bit state only. Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com> Reviewed-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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