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Message-Id: <20110928220142.908367066@clark.kroah.org>
Date:	Wed, 28 Sep 2011 15:02:11 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Michal Sroczynski <msroczyn@...il.com>
Subject: [167/244] USB: PL2303: correctly handle baudrates above 115200

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Michal Sroczynski <msroczyn@...il.com>

commit 8d48fdf689fed2c73c493e5146d1463689246442 upstream.

PL2303: correctly handle baudrates above 115200

Signed-off-by: Michal Sroczynski <msroczyn@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/serial/pl2303.c |   26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -343,10 +343,28 @@ static void pl2303_set_termios(struct tt
 				baud = 6000000;
 		}
 		dbg("%s - baud set = %d", __func__, baud);
-		buf[0] = baud & 0xff;
-		buf[1] = (baud >> 8) & 0xff;
-		buf[2] = (baud >> 16) & 0xff;
-		buf[3] = (baud >> 24) & 0xff;
+		if (baud <= 115200) {
+			buf[0] = baud & 0xff;
+			buf[1] = (baud >> 8) & 0xff;
+			buf[2] = (baud >> 16) & 0xff;
+			buf[3] = (baud >> 24) & 0xff;
+		} else {
+			/* apparently the formula for higher speeds is:
+			 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
+			 */
+			unsigned tmp = 12*1000*1000*32 / baud;
+			buf[3] = 0x80;
+			buf[2] = 0;
+			buf[1] = (tmp >= 256);
+			while (tmp >= 256) {
+				tmp >>= 2;
+				buf[1] <<= 1;
+			}
+			if (tmp > 256) {
+				tmp %= 256;
+			}
+			buf[0] = tmp;
+		}
 	}
 
 	/* For reference buf[4]=0 is 1 stop bits */


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