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drm/msm/mdp5: Prepare Layer Mixers for source split
In order to enable Source Split in HW, we need to add/modify
a few LM register configurations:
- Configure the LM width to be half the mode width, so that
each LM manages one half of the scanout.
- Tell the 'right' LM that it is configured to be the 'right'
LM in source split mode.
- Since we now have 2 places where REG_MDP5_LM_BLEND_COLOR_OUT is
configured, do a read-update-store for the register instead of
directly writing a value to it.
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>