USB: serial: cp210x: improve line-speed handling for CP2104 and CP2105

CP2104 and the ECI interface of CP2105 support further baud rates than
the ones specified in AN205 table 1, and we can use the same equations
as for CP2102N to determine and report back the actual baud rates used.

Note that this could eventually be generalised also to CP2108, which
uses a different base clock. There appears to be an error in the CP2108
equations which needs to be confirmed on actual hardware first however
(specifically, the subtraction of one from the divisor appears to be
incorrect as it introduces larger errors).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/cp210x.c

@@ -1537,14 +1537,19 @@ static void cp210x_init_max_speed(struct usb_serial *serial)
 		max = 1000000;
 		break;
 	case CP210X_PARTNUM_CP2104:
+		use_actual_rate = true;
+		max = 2000000;
+		break;
 	case CP210X_PARTNUM_CP2108:
 		max = 2000000;
 		break;
 	case CP210X_PARTNUM_CP2105:
-		if (cp210x_interface_num(serial) == 0)
+		if (cp210x_interface_num(serial) == 0) {
+			use_actual_rate = true;
 			max = 2000000;	/* ECI */
-		else
+		} else {
 			max = 921600;	/* SCI */
+		}
 		break;
 	case CP210X_PARTNUM_CP2102N_QFN28:
 	case CP210X_PARTNUM_CP2102N_QFN24: