msm_fb: display: use blt mode to implement MDP writeback

MDP frame buffer mode was used to implement writeback for
pulling interface (lcdc and dsi video). However frame buffer
mode is not recommanded by hardware engineer due to lacking
of verification. This patch will replace frame buffer mode
with BLT mode to implement MDP writeback.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
5 files changed