Revert "USB: pl2303: restrict the divisor based baud rate encoding method to the "HX" chip type"

This reverts commit b8bdad6082.

Revert all of the pl2303 changes that went into 3.12-rc1 and -rc2 as
they cause regressions on some versions of the chip.  This will all be
revisited for later kernel versions when we can figure out how to handle
this in a way that does not break working devices.

Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/pl2303.c

@@ -305,14 +305,10 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
 	if (spriv->type != HX)
 		baud = min_t(int, baud, 1228800);
 
-	if (spriv->type != HX || baud <= 115200) {
-		/* Direct (standard) baud rate encoding method */
+	if (baud <= 115200) {
 		put_unaligned_le32(baud, buf);
 	} else {
 		/*
-		 * NOTE: it's not clear if the type_0/1 chips
-		 * support this method
-		 *
 		 * Apparently the formula for higher speeds is:
 		 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
 		 */