msm: mdss: implement overlay prepare ioctl

Overlay prepare will allow a full frame with multiple overlays to be
configured at once and perform frame level checks before being pushed to
display. This function guarantees that if the call is successful, the
frame can be displayed successfully on the screen when display commit is
called.

Change-Id: I276b6fe3e0a872a2e93170f3cea1002d3ce0dac9
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
Signed-off-by: Anusha Koduru <kanusha@codeaurora.org>

Conflicts:
	include/linux/msm_mdp.h
msm: mdss: Allocate fb memory under 4GB physical address space

Linux kernel framework of framebuffer APIs do not support LPAE systems.
These APIs are using "unsigned long" data type instead of "phys_addr_t"
for physical addresses which doesn't work with LPAE systems. Until
framebuffer APIs are fixed, allocate fb memory on MSM chip-sets using
dma_alloc_coherent and GFP_KERNEL to get the memory from below 4GB
physical address space.

Conflicts:
	Documentation/devicetree/bindings/fb/mdss-mdp.txt

Change-Id: Ieca41cae21c956a8b4cf1d5729d287bb0bb30f8d
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>

Conflicts:
	arch/arm/boot/dts/msm8974-mdss.dtsi
msm: display: Add pipe type selection in overlay request

Allow user to specify the type when requesting an overlay pipe.
If field is set the pipe type indication in the flags will be
ignored.
Change-Id: Iee51d24b96c7a2a987dc70a439342e6548dfc8fa
Signed-off-by: Vineet Bajaj <vbajaj@codeaurora.org>