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: framebuffer at 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: framebuffer at 3ee48000 {
        no-map;
        reg = <0x0 0x3ee48000 0x0 0x400000>;
    };
    backbuff_reserved: framebuffer at 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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