EDP_PSR2_ENABLE
val |= EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE;
WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
~(EDP_PSR2_ENABLE | EDP_SU_TRACK_ENABLE));
WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
WARN_ON(!(val & EDP_PSR2_ENABLE));
I915_WRITE(EDP_PSR2_CTL, val & ~EDP_PSR2_ENABLE);