usb: pl2303: fix+improve the divsor based baud rate encoding method

Based on the formula in the code description, Reinhard Max and me have
investigated the devices behavior / functional principle of the divisor
based baud rate encoding method.

It turned out, that (although beeing a good starting point) the current
code has some flaws. It doesn't work correctly for a wide range of baud
rates and the divisor resolution can be improved. It also doesn't
report the actually set baud rate.

This patch fixes and improves the code for the divisor based baud rate
encoding method a lot. It can now be used for the whole range of baud
rates from 46 baud to 24M baud with a very good divisor resolution and
userspace can read back the resulting baud rate.

It also documents the formula used for encoding and the hardware
behavior (including special cases).

The basic algorithm, rounding and several code comments/explanations
are provided by Reinhard Max.
I've added some minor fixes, the handling of the special cases and
further code/algorithm descriptions.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Reinhard Max <max@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/pl2303.c

@@ -4,6 +4,11 @@
  * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
  * Copyright (C) 2003 IBM Corp.
  *
+ * Copyright (C) 2009, 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
+ *  - fixes, improvements and documentation for the baud rate encoding methods
+ * Copyright (C) 2013 Reinhard Max <max@suse.de>
+ *  - fixes and improvements for the divisor based baud rate encoding method
+ *
  * Original driver for 2.2.x by anonymous
  *
  *	This program is free software; you can redistribute it and/or
@@ -310,21 +315,58 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
 		put_unaligned_le32(baud, buf);
 	} else {
 		/*
+		 * Divisor based baud rate encoding method
+		 *
 		 * 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]
+		 * divisor = 12MHz * 32 / baudrate = 2^A * B
+		 *
+		 * with
+		 *
+		 * A = buf[1] & 0x0e
+		 * B = buf[0]  +  (buf[1] & 0x01) << 8
+		 *
+		 * Special cases:
+		 * => 8 < B < 16: device seems to work not properly
+		 * => B <= 8: device uses the max. value B = 512 instead
 		 */
-		unsigned tmp = 12000000 * 32 / baud;
-		buf[3] = 0x80;
-		buf[2] = 0;
-		buf[1] = (tmp >= 256);
-		while (tmp >= 256) {
-			tmp >>= 2;
-			buf[1] <<= 1;
+
+		/* Determine factors A and B */
+		unsigned int A = 0;
+		unsigned int B = 12000000 * 32 / baud;  /* 12MHz */
+		B <<= 1; /* Add one bit for rounding */
+		while (B > (512 << 1) && A <= 14) {
+			A += 2;
+			B >>= 2;
 		}
-		buf[0] = tmp;
+		if (A > 14) { /* max. divisor = min. baudrate reached */
+			A = 14;
+			B = 512;
+			/* => ~45.78 baud */
+		} else {
+			B = (B + 1) >> 1; /* Round the last bit */
+		}
+		/* Handle special cases */
+		if (B == 512)
+			B = 0; /* also: 1 to 8 */
+		else if (B < 16)
+			/*
+			 * NOTE: With the current algorithm this happens
+			 * only for A=0 and means that the min. divisor
+			 * (respectively: the max. baudrate) is reached.
+			 */
+			B = 16;		/* => 24 MBaud */
+		/* Encode the baud rate */
+		buf[3] = 0x80;     /* Select divisor encoding method */
+		buf[2] = 0;
+		buf[1] = (A & 0x0e);		/* A */
+		buf[1] |= ((B & 0x100) >> 8);	/* MSB of B */
+		buf[0] = B & 0xff;		/* 8 LSBs of B */
+		/* Calculate the actual/resulting baud rate */
+		if (B <= 8)
+			B = 512;
+		baud = 12000000 * 32 / ((1 << A) * B);
 	}
 
 	/* Save resulting baud rate */