I hold a Canadian Passport, HK ID Card, and Home Return Permit. Do I need a single-entry China visa for my 54-hour stay in Shanghai?

Hi,

I'm flying from Toronto to Shanghai (54 hours stay), then to Singapore, then returning back to Toronto. I hold a Canadian Passport, HK ID Card, and Home Return Permit. Do I need a single-entry China visa for my 54-hour stay in Shanghai? Can I use my Home Return Permit to enter Shanghai? Should I apply HKSAR passport to get access to China without applying for the China visa?

Thanks for your help in advance.