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DRA746: How to setting the Hardware composer and Gralloc when output the video to external LCD.

Part Number: DRA746

we used the J6 DRA746 IC in our device and find when our device only connect one display, it run the hardware composer,

when connect 2 display ,it run the Gralloc automatic( through the GPU to deal with), but it will run over the GPU usage.

so we want to run the hardware composer at 2 display in order to save the GPU.

I hope you can teach us how to set the hardware composer or give us some patch or reference doc.