HBLANK
I915_WRITE(HBLANK(pipe), (640 - 1) | ((800 - 1) << 16));
error->transcoder[i].hblank = I915_READ(HBLANK(cpu_transcoder));
I915_READ(HBLANK(cpu_transcoder)));
I915_WRITE(HBLANK(cpu_transcoder),
tmp = I915_READ(HBLANK(cpu_transcoder));