Covered call against delivery

i hold 12000 shares of PFC in delivery (2 lots) @ rs.144 per share
sold 2 lots of CE pfc strike price 150
cmp is rs. 151

stocks are not pledged. call options are sold by using free cash margin.

since now stock price is increasing …do i need to pay additional cash or not …because i want to hold my position till expiry…than i will square off my delivery and derivative positions on expiry

you dont need to pay any thing extra.

@haribabu Need little clarification here…
Can he hold the position past expiry and choose not to square off ? and instead of cash settling …can he delivery the stock to buyer …?
Considering brokerage and govt. charges what is more beneficial …squaring off before expiry or physical settlement?