Exclude particular post_formats from the Home Page

How could a (or some) post format(s) be excluded from the front page of p2 theme ?

Have tried the following but not successful.

function exclude_postformat($query) {
    if ( $query->is_home ) {

	// Array of post formats to exclude, by slug
		$post_formats_to_exclude = array(
			'status',
			'quote',
			'link'
		);

            array(
                'taxonomy' => 'post_format',
                'field' => 'slug',
                'terms' => $post_formats_to_exclude,
                'operator' => 'NOT IN'
            );
    }
    return $query;
}
add_filter('pre_get_posts', 'exclude_postformat');

Any ideas most welcome.