Ping Pong Buffer Implementation in XORG

[Dwivedi, Prija]

Hi,

My current system configuration is like application gives the frame to XORG and XORG is configured to use simple frame buffer driver(mapped to DDR address).
I need to implement a ping pong buffer utility in such a way that every new frame goes to two different DDR addresses.
I can reserve two block of memory in simple frame buffer driver adding below mentioned code in system-user.dtsi:
chosen {
framebuffer0: ***@3ee48000 {
compatible = "simple-framebuffer";
memory-region = <&frontbuff_reserved> <&backbuff_reserved>;
width = <1280>;
height = <800>;
stride = <5120>;
format = "a8r8g8b8";
status = "okay";
};

};


reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
ranges;

frontbuff_reserved: ***@3ee48000 {
no-map;
reg = <0x0 0x3ee48000 0x0 0x400000>;
};
backbuff_reserved: ***@3f248000 {
no-map;
reg = <0x0 0x3f248000 0x0 0x400000>;
};
};
But I need some support in how XORG can use these two memory alternatively on every frame/image at runtime.
I have attached the xorg log file and conf file for reference.

Regards,
Prija

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