VT1724_MT_I2S_MCLK_128X
outb(i2s_oval & ~VT1724_MT_I2S_MCLK_128X, ICEMT1724(ice, I2S_FORMAT));
val |= VT1724_MT_I2S_MCLK_128X; /* 128x MCLK */
val &= ~VT1724_MT_I2S_MCLK_128X; /* 256x MCLK */