DPI_ENABLE
if (!(tmp & DPI_ENABLE))
bool enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
if (I915_READ(BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
I915_WRITE(port_ctrl, temp | DPI_ENABLE);
I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);