CURPOS
I915_WRITE_FW(CURPOS(pipe), pos);
I915_WRITE_FW(CURPOS(pipe), pos);
error->cursor[i].position = I915_READ(CURPOS(i));
I915_WRITE_FW(CURPOS(PIPE_A), pos);
I915_WRITE_FW(CURPOS(PIPE_A), pos);