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In case of some platforms fimd clocks can be configured to very low values, as a result refresh rate can be very low and driver/drm-core will timeout waiting for vblanks, it will result in premature removal of framebuffers and will cause oopses. The patch adds atomic_check callback to fimd to prevent setting such modes. Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>