linux-kernel - [88/89] USB: cp210x: allow more baud rates above 1Mbaud

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Message-Id: <20120201210051.613624456@clark.kroah.org>
Date:	Wed, 01 Feb 2012 13:00:52 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Johan Hovold <jhovold@...il.com>,
	Preston Fick <preston.fick@...abs.com>
Subject: [88/89] USB: cp210x: allow more baud rates above 1Mbaud

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Johan Hovold <jhovold@...il.com>

commit d1620ca9e7bb0030068c3b45b653defde8839dac upstream.

Allow more baud rates to be set in [1M,2M] baud.

Signed-off-by: Johan Hovold <jhovold@...il.com>
Cc: Preston Fick <preston.fick@...abs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/serial/cp210x.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -388,10 +388,10 @@ static unsigned int cp210x_quantise_baud
 	else if (baud <= 491520)   baud = 460800;
 	else if (baud <= 567138)   baud = 500000;
 	else if (baud <= 670254)   baud = 576000;
-	else if (baud <= 1053257)  baud = 921600;
-	else if (baud <= 1474560)  baud = 1228800;
-	else if (baud <= 2457600)  baud = 1843200;
-	else                       baud = 3686400;
+	else if (baud < 1000000)
+		baud = 921600;
+	else if (baud > 2000000)
+		baud = 2000000;
 	return baud;
 }
 
@@ -611,7 +611,8 @@ static void cp210x_change_speed(struct t
 
 	baud = tty->termios->c_ospeed;
 
-	/* This maps the requested rate to a rate valid on cp2102 or cp2103.
+	/* This maps the requested rate to a rate valid on cp2102 or cp2103,
+	 * or to an arbitrary rate in [1M,2M].
 	 *
 	 * NOTE: B0 is not implemented.
 	 */


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