Hi dear... If tooth gets chipped due to impact on it, requirement of Root canal treatment depends on whether the pulp gets involved or not. As per your complaint and pic you provided, the best treatment is to build up the broken part with composite (which you already got it done) and wait. Sometimes the tooth may recover and may not require root canal treatment.
Get check ups and xrays done every month just to be sure if the tooth is OK. In case any changes are evident, you will require root canal treatment and an emax crown.
Next Steps
Avoid biting hard things from treated tooth
Health Tips
Visit your dentist for regular check ups