* [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7?
@ 2020-08-19 2:52 bugzilla-daemon
2020-08-24 8:42 ` Johan Hovold
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: bugzilla-daemon @ 2020-08-19 2:52 UTC (permalink / raw)
To: linux-usb
https://bugzilla.kernel.org/show_bug.cgi?id=208959
Bug ID: 208959
Summary: USB-serial (mct_u232): bit7=1 when tty is set to cs7?
Product: Drivers
Version: 2.5
Kernel Version: 5.7.0
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: USB
Assignee: drivers_usb@kernel-bugs.kernel.org
Reporter: mslade@epic-code.com.au
Regression: No
I'm not 100% certain this is a bug, please let me know if this is expected
behavior.
I have hooked an old serial mouse up to a USB serial device, USB ID 0711:0230
(part of an circa 2000 Targus port replicator)
when I configure it with the appropriate 1200 baud and 7 bit char width, the
bytes that come through /dev/ttyUSB0 all have bit7 set to 1.
This behavior is in contrast to an old serial port on a box running a 2.4.19
kernel.
Is there a standard for the value that non-data bits should be set to?
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7?
2020-08-19 2:52 [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7? bugzilla-daemon
@ 2020-08-24 8:42 ` Johan Hovold
2020-08-24 8:42 ` [Bug 208959] " bugzilla-daemon
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Johan Hovold @ 2020-08-24 8:42 UTC (permalink / raw)
To: bugzilla-daemon; +Cc: linux-usb
On Wed, Aug 19, 2020 at 02:52:47AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208959
>
> Bug ID: 208959
> Summary: USB-serial (mct_u232): bit7=1 when tty is set to cs7?
> Product: Drivers
> Version: 2.5
> Kernel Version: 5.7.0
> Hardware: All
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: low
> Priority: P1
> Component: USB
> Assignee: drivers_usb@kernel-bugs.kernel.org
> Reporter: mslade@epic-code.com.au
> Regression: No
>
> I'm not 100% certain this is a bug, please let me know if this is expected
> behavior.
>
> I have hooked an old serial mouse up to a USB serial device, USB ID 0711:0230
> (part of an circa 2000 Targus port replicator)
>
> when I configure it with the appropriate 1200 baud and 7 bit char width, the
> bytes that come through /dev/ttyUSB0 all have bit7 set to 1.
>
> This behavior is in contrast to an old serial port on a box running a 2.4.19
> kernel.
>
> Is there a standard for the value that non-data bits should be set to?
This sounds like a configuration issue. If the mouse is indeed using
7n1 and the converter is expecting 8n1 you could end up with bit 7
always set on input.
Can you verify that the converter is configured correctly, for example,
by reading out the termios settings, enabling debugging and/or
connecting it to another serial port configured for 7n1?
Johan
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug 208959] USB-serial (mct_u232): bit7=1 when tty is set to cs7?
2020-08-19 2:52 [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7? bugzilla-daemon
2020-08-24 8:42 ` Johan Hovold
@ 2020-08-24 8:42 ` bugzilla-daemon
2020-08-25 15:20 ` bugzilla-daemon
2020-08-26 7:08 ` bugzilla-daemon
3 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2020-08-24 8:42 UTC (permalink / raw)
To: linux-usb
https://bugzilla.kernel.org/show_bug.cgi?id=208959
--- Comment #1 from Johan Hovold (johan@kernel.org) ---
On Wed, Aug 19, 2020 at 02:52:47AM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208959
>
> Bug ID: 208959
> Summary: USB-serial (mct_u232): bit7=1 when tty is set to cs7?
> Product: Drivers
> Version: 2.5
> Kernel Version: 5.7.0
> Hardware: All
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: low
> Priority: P1
> Component: USB
> Assignee: drivers_usb@kernel-bugs.kernel.org
> Reporter: mslade@epic-code.com.au
> Regression: No
>
> I'm not 100% certain this is a bug, please let me know if this is expected
> behavior.
>
> I have hooked an old serial mouse up to a USB serial device, USB ID 0711:0230
> (part of an circa 2000 Targus port replicator)
>
> when I configure it with the appropriate 1200 baud and 7 bit char width, the
> bytes that come through /dev/ttyUSB0 all have bit7 set to 1.
>
> This behavior is in contrast to an old serial port on a box running a 2.4.19
> kernel.
>
> Is there a standard for the value that non-data bits should be set to?
This sounds like a configuration issue. If the mouse is indeed using
7n1 and the converter is expecting 8n1 you could end up with bit 7
always set on input.
Can you verify that the converter is configured correctly, for example,
by reading out the termios settings, enabling debugging and/or
connecting it to another serial port configured for 7n1?
Johan
--
You are receiving this mail because:
You are watching the assignee of the bug.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug 208959] USB-serial (mct_u232): bit7=1 when tty is set to cs7?
2020-08-19 2:52 [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7? bugzilla-daemon
2020-08-24 8:42 ` Johan Hovold
2020-08-24 8:42 ` [Bug 208959] " bugzilla-daemon
@ 2020-08-25 15:20 ` bugzilla-daemon
2020-08-26 7:08 ` Johan Hovold
2020-08-26 7:08 ` bugzilla-daemon
3 siblings, 1 reply; 6+ messages in thread
From: bugzilla-daemon @ 2020-08-25 15:20 UTC (permalink / raw)
To: linux-usb
https://bugzilla.kernel.org/show_bug.cgi?id=208959
--- Comment #2 from mslade@epic-code.com.au (mslade@epic-code.com.au) ---
Please clarify what you mean by "converter" here.
FYI to test I was just doing this:
# stty -F /dev/ttyUSB0 1200 cs7
# dd if=/dev/ttyUSB0 bs=1|hd
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You are receiving this mail because:
You are watching the assignee of the bug.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Bug 208959] USB-serial (mct_u232): bit7=1 when tty is set to cs7?
2020-08-25 15:20 ` bugzilla-daemon
@ 2020-08-26 7:08 ` Johan Hovold
0 siblings, 0 replies; 6+ messages in thread
From: Johan Hovold @ 2020-08-26 7:08 UTC (permalink / raw)
To: bugzilla-daemon; +Cc: linux-usb
On Tue, Aug 25, 2020 at 03:20:48PM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208959
>
> --- Comment #2 from mslade@epic-code.com.au (mslade@epic-code.com.au) ---
> Please clarify what you mean by "converter" here.
I was referring to the USB-serial device.
> FYI to test I was just doing this:
>
> # stty -F /dev/ttyUSB0 1200 cs7
What is the output of "stty -a -F /dev/ttyUSB0" after this?
> # dd if=/dev/ttyUSB0 bs=1|hd
Try using a terminal program instead and connect the device to another
USB-serial device (e.g. ftdi or pl2303) and see if you can get 7-bit
words to work.
You can also try enabling debugging and provide the relevant bits from
dmesg when you connect, configure and read from the device:
echo module mct_u232 +p > /sys/kernel/debug/dynamic_debug/control
Johan
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug 208959] USB-serial (mct_u232): bit7=1 when tty is set to cs7?
2020-08-19 2:52 [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7? bugzilla-daemon
` (2 preceding siblings ...)
2020-08-25 15:20 ` bugzilla-daemon
@ 2020-08-26 7:08 ` bugzilla-daemon
3 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2020-08-26 7:08 UTC (permalink / raw)
To: linux-usb
https://bugzilla.kernel.org/show_bug.cgi?id=208959
--- Comment #3 from Johan Hovold (johan@kernel.org) ---
On Tue, Aug 25, 2020 at 03:20:48PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208959
>
> --- Comment #2 from mslade@epic-code.com.au (mslade@epic-code.com.au) ---
> Please clarify what you mean by "converter" here.
I was referring to the USB-serial device.
> FYI to test I was just doing this:
>
> # stty -F /dev/ttyUSB0 1200 cs7
What is the output of "stty -a -F /dev/ttyUSB0" after this?
> # dd if=/dev/ttyUSB0 bs=1|hd
Try using a terminal program instead and connect the device to another
USB-serial device (e.g. ftdi or pl2303) and see if you can get 7-bit
words to work.
You can also try enabling debugging and provide the relevant bits from
dmesg when you connect, configure and read from the device:
echo module mct_u232 +p > /sys/kernel/debug/dynamic_debug/control
Johan
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You are receiving this mail because:
You are watching the assignee of the bug.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-08-26 7:08 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-08-19 2:52 [Bug 208959] New: USB-serial (mct_u232): bit7=1 when tty is set to cs7? bugzilla-daemon
2020-08-24 8:42 ` Johan Hovold
2020-08-24 8:42 ` [Bug 208959] " bugzilla-daemon
2020-08-25 15:20 ` bugzilla-daemon
2020-08-26 7:08 ` Johan Hovold
2020-08-26 7:08 ` bugzilla-daemon
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