Data not displaying in text field

Try Like below

function fhaac_subject_box_callback( $post ){
 wp_nonce_field( basename(__FILE__ ), 'fhacc_subject_nounce');
 $fhaac_stored_subject_meta = get_post_meta( '$post->ID' );
 $fhaac_subject_name = get_post_meta($post->ID, 'my_data_subjectName', true);
?>

<div>Subject name: <input type="text" name="fhaac_subject_name" id="fhaac_
subject_name" value="<?= $fhaac_subject_name; ?>"/></div>

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