VTOTAL
vtotal_reg = VTOTAL(pipe);
I915_WRITE(VTOTAL(pipe), (480 - 1) | ((525 - 1) << 16));
error->transcoder[i].vtotal = I915_READ(VTOTAL(cpu_transcoder));
I915_READ(VTOTAL(cpu_transcoder)));
I915_WRITE(VTOTAL(cpu_transcoder),
I915_WRITE(VTOTAL(pipe), I915_READ(VTOTAL(cpu_transcoder)));
tmp = I915_READ(VTOTAL(cpu_transcoder));