El 1/6/21 a las 10:40, Johan Hovold escribió:
On Tue, Jun 01, 2021 at 09:51:56AM -0500, Alex Villacís Lasso wrote:
Here is the full result of the test I performed. First I installed the
distro kernel update, kernel-5.12.8-300.fc34.x86_64, then rebooted.
Anything with a date is the journalctl output. Everything else is
console input and output. I have pasted the relevant journalctl messages
immediately after the command or action that triggered them.
$ miniterm.py /dev/ttyUSB0 115200
Traceback (most recent call last):
File "/usr/bin/miniterm.py", line 976, in <module>
main()
File "/usr/bin/miniterm.py", line 932, in main
serial_instance.open()
File "/usr/lib/python3.9/site-packages/serial/serialposix.py", line
288, in open
self._update_rts_state()
File "/usr/lib/python3.9/site-packages/serial/serialposix.py", line
627, in _update_rts_state
fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_RTS_str)
BrokenPipeError: [Errno 32] Broken pipe
jun 01 09:23:43 karlalex-asus systemd[1665]: Started VTE child process
3306 launched by gnome-terminal-server process 2856.
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_change_speed - setting baud rate to 9600
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x00, flow = 0x01
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0303
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_change_speed - setting baud rate to 115384
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x01, flow = 0x40
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0101
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0202
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
jun 01 09:23:55 karlalex-asus python3[3362]: detected unhandled Python
exception in '/usr/bin/miniterm.py'
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0300
jun 01 09:23:55 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
Thanks a lot for this.
Could you try applying the below patch, and with debugging enabled
1. plug the device in
2. start the terminal program
and then send me the logs?
This should show the current device settings which appear to have flow
control enabled (which the driver fails to disable).
I note that the mere act of running stty -a on the device also triggers
the error.
Yeah, you'll see this error on every open/close when the driver tries to
assert/deassert RTS.
Johan
From 736c4c099591317d55a20da627db3b148d8d71ca Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Tue, 1 Jun 2021 17:29:01 +0200
Subject: [PATCH] USB: cp210x: add flow-control debugging
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/cp210x.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ee595d1bea0a..92382798b574 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1159,6 +1159,12 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
+ dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
+ ctl_hs, flow_repl);
+ dev_dbg(&port->dev, "%s - xon_limit = %u, xoff_limit = %u\n", __func__,
+ le32_to_cpu(flow_ctl.ulXonLimit),
+ le32_to_cpu(flow_ctl.ulXoffLimit));
+
ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
As before:
# echo module cp210x +p > /sys/kernel/debug/dynamic_debug/control
# insmod ./cp210x.ko dyndbg==p
jun 01 12:09:51 karlalex-asus kernel: usbcore: registered new interface
driver cp210x
jun 01 12:09:51 karlalex-asus kernel: usbserial: USB Serial support
registered for cp210x
<device plugged in>
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: new full-speed USB device
number 7 using xhci_hcd
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: New USB device found,
idVendor=10c4, idProduct=ea60, bcdDevice= 1.00
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: New USB device strings:
Mfr=1, Product=2, SerialNumber=3
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: Product: CP2102N USB to
UART Bridge Controller
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: Manufacturer: Silicon Labs
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: SerialNumber:
283405bafee6e81182024fe64b629a73
jun 01 12:11:38 karlalex-asus kernel: cp210x 1-9:1.0: cp210x converter
detected
jun 01 12:11:38 karlalex-asus kernel: usb 1-9: cp210x converter now
attached to ttyUSB0
jun 01 12:11:38 karlalex-asus mtp-probe[11596]: checking bus 1, device
7: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9"
jun 01 12:11:38 karlalex-asus mtp-probe[11596]: bus: 1, device: 7 was
not an MTP device
jun 01 12:11:38 karlalex-asus mtp-probe[11613]: checking bus 1, device
7: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9"
jun 01 12:11:38 karlalex-asus mtp-probe[11613]: bus: 1, device: 7 was
not an MTP device
jun 01 12:11:40 karlalex-asus ModemManager[726]: <info> [base-manager]
couldn't check support for device
'/sys/devices/pci0000:00/0000:00:14.0/usb1/1-9': not supported by any
plugin
$ miniterm.py /dev/ttyUSB0 115200
Traceback (most recent call last):
File "/usr/bin/miniterm.py", line 976, in <module>
main()
File "/usr/bin/miniterm.py", line 932, in main
serial_instance.open()
File "/usr/lib/python3.9/site-packages/serial/serialposix.py", line
288, in open
self._update_rts_state()
File "/usr/lib/python3.9/site-packages/serial/serialposix.py", line
627, in _update_rts_state
fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_RTS_str)
BrokenPipeError: [Errno 32] Broken pipe
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_change_speed - setting baud rate to 9600
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x00, flow = 0x00
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - xon_limit = 0, xoff_limit = 0
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x00, flow = 0x01
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0303
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_change_speed - setting baud rate to 115384
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x00, flow = 0x01
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - xon_limit = 128, xoff_limit = 128
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_set_flow_control - ctrl = 0x01, flow = 0x40
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0101
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0202
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
jun 01 12:12:13 karlalex-asus python3[11633]: detected unhandled Python
exception in '/usr/bin/miniterm.py'
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0:
cp210x_tiocmset_port - control = 0x0300
jun 01 12:12:13 karlalex-asus kernel: cp210x ttyUSB0: failed set request
0x7 status: -32
jun 01 12:12:13 karlalex-asus abrt-server[11634]: Deleting problem
directory Python3-2021-06-01-12:12:13-11633 (dup of
Python3-2021-05-27-14:26:21-17653)
jun 01 12:12:13 karlalex-asus abrt-notification[11653]: [🡕] Process
17653 (miniterm.py) of user 1000 encountered an uncaught BrokenPipeError
exception
