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when fb changing is requested, crtc's dpms mode should be on.
if not on, return -EPERM so that the hardware can't be accessed.
if user requesed dpms off and next SetCrtc with an another fb
then the hardware can be accessed with dpms off to write overlay
data onto some registers so this patch will prevent from accessing
the hardware with dpms off.
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
32aeab1745