I assume you are a full year PA resident. If so, you can enter PA in box 15 of your W-2, to get TurboTax (TT) to handle it properly.
As a full year resident, PA taxes all your income, regardless of where earned. If you pay income tax to another state, PA will give you a credit*. But TN doesn't have an income tax, so that's not an issue.
*except reciprocal states
