According to Article 64 of the 2005 Iraqi constitution, the Supreme Court has no authority to dissolve the House of Representatives.
The court's powers are limited and do not include the dissolution of parliament. 

After four postponements, the supreme court met today, Wednesday, to decide on the fate of the parliament. The court met on the request of Iraq’s popular cleric Muqtada al-Sadr whose supporters occupied Baghdad’s Green Zone and called for an early election and dissolution of the parliament. 

The decision might again suspend everyday politics and oblige the political parties to impose their wills through their people, not state institutions.