From: Robert Wolters <robert@woltersonline.net>
To: johan@kernel.org
Cc: linux-usb@vger.kernel.org
Subject: set custom baud-rate for SCS P4 Dragon
Date: Thu, 6 May 2021 09:43:41 +0200 [thread overview]
Message-ID: <c964941a-a04a-7402-597c-d0bce15de5d7@woltersonline.net> (raw)
|Why: FTDI USB serial speed issue with SCS P4 Dragon short-wave modems,
a custom baud-rate is required Solution: set special baud-rate by
setting a custom divisor on 38400B Signed-off-by: Robert Wolters
<robert@woltersonline.net> | ||--- ftdi_sio.c 2021-04-21
13:01:00.000000000 +0200| ||+++ ftdi_sio.c 2021-04-26 18:53:00.819175707
+0200| ||@@ -97,6 +97,7 @@| |||static int ftdi_8u2232c_probe(struct
usb_serial *serial);| ||static void ftdi_USB_UIRT_setup(struct
ftdi_private *priv);||||static void ftdi_HE_TIRA1_setup(struct
ftdi_private *priv);| |+static void ftdi_SCS_DR7X00_setup(struct
ftdi_private *priv);| ||static const struct ftdi_sio_quirk
ftdi_jtag_quirk = {| |||.probe = ftdi_jtag_probe,| |||@@ -122,6 +123,10
@@| |||.probe = ftdi_8u2232c_probe,| |||}; ||||+static const struct
ftdi_sio_quirk ftdi_SCS_DR7X00_quirk = {| |||+ .port_probe =
ftdi_SCS_DR7X00_setup,| |||+};| |||+| |||/*| ||* The 8U232AM has the
same API as the sio except for:| |* - it can support MUCH higher
baudrates; up to:| |@@ -157,8 +162,12 @@| |{ USB_DEVICE(FTDI_VID,
FTDI_EV3CON_PID) },| |{ USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_0_PID) },|
|{ USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_1_PID) },| |- {
USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) },| |- {
USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_3_PID) },| |+ {
USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) ,| |+ .driver_info =
(kernel_ulong_t)&ftdi_SCS_DR7X00_quirk },| |+ { USB_DEVICE(FTDI_VID,
FTDI_SCS_DEVICE_3_PID) ,| |+ .driver_info =
(kernel_ulong_t)&ftdi_SCS_DR7X00_quirk },| |{ USB_DEVICE(FTDI_VID,
FTDI_SCS_DEVICE_4_PID) },| |{ USB_DEVICE(FTDI_VID,
FTDI_SCS_DEVICE_5_PID) },| |{ USB_DEVICE(FTDI_VID,
FTDI_SCS_DEVICE_6_PID) },| |@@ -2296,6 +2305,15 @@| |priv->force_rtscts
= 1;| |}| |+/* Setup for the SCS P4dragon DR-7X00 devices, which
require| |+ *hardwired baud-rate of 829440 (38400 gets mapped to 829440)
*/| |+static void ftdi_SCS_DR7X00_setup(struct ftdi_private *priv)| |+{|
|+ priv->flags |= ASYNC_SPD_CUST;| |+ priv->custom_divisor = 29;| |+
priv->force_baud = 38400;| |+}| |+| |||||/*| |* Module parameter to
control latency timer for NDI FTDI-based USB devices.| |* If this value
is not set in /etc/modprobe.d/ its value will be set|
next reply other threads:[~2021-05-06 7:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 7:43 Robert Wolters [this message]
2021-05-06 7:56 ` set custom baud-rate for SCS P4 Dragon Greg KH
2021-05-06 8:44 Set " Robert Wolters
2021-05-10 8:22 ` Johan Hovold
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c964941a-a04a-7402-597c-d0bce15de5d7@woltersonline.net \
--to=robert@woltersonline.net \
--cc=johan@kernel.org \
--cc=linux-usb@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).