TV_ENC_ENABLE
tv_ctl &= ~(TV_ENC_ENABLE | TV_ENC_PIPE_SEL_MASK | TV_TEST_MODE_MASK);
return tmp & TV_ENC_ENABLE;
I915_WRITE(TV_CTL, I915_READ(TV_CTL) | TV_ENC_ENABLE);
I915_WRITE(TV_CTL, I915_READ(TV_CTL) & ~TV_ENC_ENABLE);