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drm: apple: backlight: avoid updating the brightness with a commit
An atomic_commit for brightness changes will consume a DCP swap without
frame buffer updates and will result in a lost frame. After updating
the next brightness values wait for 1 frame duration (at 23.976 fps).
Check if the brightness update still needs to be send to DVCP or if a
swap did that in the meintime.
Signed-off-by: Janne Grunau <j@jannau.net>
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