V4L/DVB (6641): xc2028: correct tuner offset for 7MHz DTV

7MHz bandwidth DVB-T needs an adjusted offset at the PLL to ensure the IF
output is correctly centered.
Signed-off-by: NChris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/tuner-xc2028.c

@@ -764,8 +764,11 @@ static int generic_set_tv_freq(struct dvb_frontend *fe, u32 freq /* in Hz */ ,
 	if (check_firmware(fe, new_mode, std, bandwidth) < 0)
 		goto ret;
 
-	if (new_mode == T_DIGITAL_TV)
+	if (new_mode == T_DIGITAL_TV) {
 		offset = 2750000;
+		if (priv->bandwidth == BANDWIDTH_7_MHZ)
+			offset -= 500000;
+	}
 
 	div = (freq - offset + DIV / 2) / DIV;