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Koen Kooi
ebbeb55561
Also add script used to generate patches and SRC_URI Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
79 lines
3.2 KiB
Diff
79 lines
3.2 KiB
Diff
From 15cbe972586b6a980e1ec5e5ea1f6335a58a801c Mon Sep 17 00:00:00 2001
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From: Preston Fick <preston.fick@silabs.com>
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Date: Mon, 16 Jan 2012 18:14:09 -0600
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Subject: [PATCH 83/90] USB: cp210x: fix CP2104 baudrate usage
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commit 7f482fc88ac47662228d6b1f05759797c8936a30 upstream.
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This fix changes the way baudrates are set on the CP210x devices from
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Silicon Labs. The CP2101/2/3 will respond to both a GET/SET_BAUDDIV
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command, and GET/SET_BAUDRATE command, while CP2104 and higher devices
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only respond to GET/SET_BAUDRATE. The current cp210x.ko driver in
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kernel version 3.2.0 only implements the GET/SET_BAUDDIV command.
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This patch implements the two new codes for the GET/SET_BAUDRATE
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commands. Then there is a change in the way that the baudrate is
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assigned or retrieved. This is done according to the CP210x USB
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specification in AN571. This document can be found here:
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http://www.silabs.com/pages/DownloadDoc.aspx?FILEURL=Support%20Documents/TechnicalDocs/AN571.pdf&src=DocumentationWebPart
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Sections 5.3/5.4 describe the USB packets for the old baudrate method.
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Sections 5.5/5.6 describe the USB packets for the new method. This
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patch also implements the new request scheme, and eliminates the
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unnecessary baudrate calculations since it uses the "actual baudrate"
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method.
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This patch solves the problem reported for the CP2104 in bug 42586,
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and also keeps support for all other devices (CP2101/2/3).
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This patchfile is also attached to the bug report on
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bugzilla.kernel.org. This patch has been developed and test on the
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3.2.0 mainline kernel version under Ubuntu 10.11.
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Signed-off-by: Preston Fick <preston.fick@silabs.com>
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[duplicate patch also sent by Johan - gregkh]
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Signed-off-by: Johan Hovold <jhovold@gmail.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/serial/cp210x.c | 10 ++++------
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1 file changed, 4 insertions(+), 6 deletions(-)
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diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
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index cbcaddb..60993dc 100644
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--- a/drivers/usb/serial/cp210x.c
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+++ b/drivers/usb/serial/cp210x.c
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@@ -202,6 +202,8 @@ static struct usb_serial_driver cp210x_device = {
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#define CP210X_EMBED_EVENTS 0x15
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#define CP210X_GET_EVENTSTATE 0x16
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#define CP210X_SET_CHARS 0x19
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+#define CP210X_GET_BAUDRATE 0x1D
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+#define CP210X_SET_BAUDRATE 0x1E
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/* CP210X_IFC_ENABLE */
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#define UART_ENABLE 0x0001
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@@ -456,10 +458,7 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
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dbg("%s - port %d", __func__, port->number);
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- cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
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- /* Convert to baudrate */
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- if (baud)
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- baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
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+ cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4);
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dbg("%s - baud rate = %d", __func__, baud);
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*baudp = baud;
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@@ -594,8 +593,7 @@ static void cp210x_set_termios(struct tty_struct *tty,
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if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
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dbg("%s - Setting baud rate to %d baud", __func__,
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baud);
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- if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
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- ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
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+ if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 4)) {
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dbg("Baud rate requested not supported by device");
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baud = tty_termios_baud_rate(old_termios);
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}
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--
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1.7.9.4
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