As well as the use of face down restraint being high on the wards, the report said mechanical restraint was not carried out in line with national guidance and could put people at risk of harm.
Inspectors added that at the time of inspection the trust had started to reduce these incidents.
Staff had not received the necessary training to support people appropriately and did not always raise safeguarding concerns to relevant partner organisations to help protect people from harm, the CQC said.
The trust said the wards are using a new ligature assessment tool to identify areas of higher risk and that it was adding managing that risk to its mandatory staff training programme.
It also said that last year it introduced mandatory training on how to support autistic people and those with learning disabilities.
Glacken said the report “highlighted a number of positives” and that “young people told inspectors that staff treated them with warmth, empathy and respect”.
“We accept the findings of this report and are working hard to make improvements,” she said.
“Providing safe, high-quality care is our top priority.”
Glacken added the trust was reviewing and updating its restraint policy “to ensure it is clearer about the exceptional circumstances in which restraint can be used”.