linux-kernel - Likely issue with ch341 kernel-module/driver

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Message-ID: <CAHP4M8X3yC8tC-=pEt2wMqO_S7nrELAGMOVY5aTf73AEup9qOQ@mail.gmail.com>
Date:	Wed, 26 Aug 2015 21:39:36 +0530
From:	Ajay Garg <ajaygargnsit@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Likely issue with ch341 kernel-module/driver

Hi all.

I am attaching the RS232-TTL via a serial-USB converter on my machine.

However, when I connect a putty-session with my embedded-device, I see
strange issues (garbage characters transmitted from embedded-device to
putty; nothing can be read from putty into embedded-device).

It seems that there is some issue with the driver.
Lots of these lines are seen in dmesg ::


########################################################################################
[ 8657.022997] ch341-uart ttyUSB0:
usb_serial_generic_read_bulk_callback - nonzero urb status: -71
########################################################################################



Other informations ::

########################################################################################
ajay@...y-HP-15-Notebook-PC:~$ lsusb
Bus 001 Device 002: ID 8087:8001 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 05c8:036e Cheng Uei Precision Industry Co., Ltd (Foxlink)
Bus 002 Device 002: ID 0bda:b001 Realtek Semiconductor Corp.
Bus 002 Device 011: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
########################################################################################


########################################################################################
ajay@...y-HP-15-Notebook-PC:~$ lsmod | grep ch341
ch341                  13761  1
usbserial              38972  3 ch341
########################################################################################


########################################################################################
ajay@...y-HP-15-Notebook-PC:~$ uname -a
Linux ajay-HP-15-Notebook-PC 3.16.0-30-generic #40~14.04.1-Ubuntu SMP
Thu Jan 15 17:45:15 UTC 2015 i686 i686 i686 GNU/Linux
########################################################################################



Any chance this can be made to work? Any upgrade that might solve the issue?
We will be grateful for ideas.


Thanks and Regards,
Ajay
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