Set Mipmap Filter

var config = {
    type: Phaser.AUTO,
    parent: 'phaser-example',
    mipmapFilter: 'LINEAR_MIPMAP_LINEAR',
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('uv', 'assets/pics/uv-grid-4096-ian-maclachlan.png');
}

function create ()
{
    //  4096 x 4096 texture

    this.add.image(0, 0, 'uv').setOrigin(0, 0).setDisplaySize(512, 512);

    this.add.image(512, 0, 'uv').setOrigin(0, 0).setDisplaySize(256, 256);

    this.add.image(768, 0, 'uv').setOrigin(0, 0).setDisplaySize(128, 128);

    this.add.image(896, 0, 'uv').setOrigin(0, 0).setDisplaySize(64, 64);
}