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Thu, 6 May 2021 09:43:42 +0200 (CEST) To: johan@kernel.org Cc: linux-usb@vger.kernel.org From: Robert Wolters Subject: set custom baud-rate for SCS P4 Dragon Message-ID: Date: Thu, 6 May 2021 09:43:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org |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 | ||--- 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|