[PATCH] serial: allow specifying baudrate to use via udev tags

[Aleksander Morgado]

Hey Jan,

See comments inline below.

>
> When you are saying not to mix e-mail threads you mean not to reply all? I am only replying to e-mails which are related to my problem.

It's ok to reply-all; but we're now talking in an email thread about
the ID_MM_TTY_BAUDRATE related patch, which you didn't even test :)
The original thread you opened had subject "Could not acquire the
'org.freedesktop.ModemManager1' service name"; and things have evolved
from that original issue to the fact that the TTY isn't correctly
probed, and now we're talking in the email thread about a patch I sent
last week which is already merged in git master; a bit of a mess! ;)

BTW, now that we're into mailing list etiquette, top-posting is also
not a good way to write to the mailing list, see:
http://www.idallen.com/topposting.html

These two previous things are so that everything is kept tidy for
everyone to easily follow; not everyone is interested in every topic
posted here. :)

> I have done mmcli -S and that command response with "successfully requested to scan devices". Here is the output from ModemManager debug session:
>
> ModemManager[1532]: <debug> [1490186663.752548] [mm-plugin.c:767] mm_plugin_supports_port(): (Generic) [ttymxc2] probe required: 'at, qcdm'
> ModemManager[1532]: <debug> [1490186663.752733] [mm-port-probe.c:1353] mm_port_probe_run(): (tty/ttymxc2) launching port probing: 'qcdm'
> ModemManager[1532]: <debug> [1490186663.752965] [mm-port-probe.c:658] serial_probe_qcdm(): (tty/ttymxc2) probing QCDM...
> ModemManager[1532]: <debug> [1490186663.753384] [mm-port-serial.c:1099] mm_port_serial_open(): (ttymxc2) opening serial port...
> ModemManager[1532]: <debug> [1490186663.755754] [mm-port-serial.c:1237] mm_port_serial_open(): (ttymxc2) device open count is 1 (open)
> ModemManager[1532]: <debug> [1490186663.756270] [mm-port-serial-qcdm.c:201] debug_log(): (ttymxc2): --> 7e 00 78 f0 7e
> ModemManager[1532]: <debug> [1490186666.742982] [mm-port-serial-qcdm.c:201] debug_log(): (ttymxc2): --> 7e 00 78 f0 7e
> ModemManager[1532]: <debug> [1490186669.743253] [mm-port-probe.c:258] mm_port_probe_set_result_qcdm(): (tty/ttymxc2) port is not QCDM-capable
> ModemManager[1532]: <debug> [1490186669.746282] [mm-port-serial.c:1296] mm_port_serial_close(): (ttymxc2) device open count is 0 (close)
> ModemManager[1532]: <debug> [1490186669.748909] [mm-port-serial.c:1312] mm_port_serial_close(): (ttymxc2) closing serial port...
> ModemManager[1532]: <debug> [1490186669.759468] [mm-port-serial.c:1361] mm_port_serial_close(): (ttymxc2) serial port closed
> ModemManager[1532]: <debug> [1490186669.759689] [mm-port-serial.c:1415] port_serial_close_force(): (ttymxc2) forced to close port
> ModemManager[1532]: <debug> [1490186669.760001] [mm-plugin-manager.c:462] plugin_supports_port_ready(): (Plugin Manager) (Generic) [ttymxc2] found best plugin for port
> ModemManager[1532]: <debug> [1490186669.760300] [mm-plugin-manager.c:316] port_probe_context_finished(): (Plugin Manager) 'ttymxc2' port probe finished, last one in device
> ModemManager[1532]: <debug> [1490186669.760459] [mm-plugin-manager.c:138] find_device_support_context_complete_and_free(): (Plugin Manager) [/sys/devices/soc0/soc/2100000.aips-bus/21ec000.serial] device support check finished in '15.800204' seconds
> ModemManager[1532]: <info>  [1490186669.760657] [mm-device.c:509] mm_device_create_modem(): Creating modem with plugin 'Generic' and '1' ports
> ModemManager[1532]: <warn>  [1490186669.773671] [mm-plugin.c:905] mm_plugin_create_modem(): Could not grab port (tty/ttymxc2): 'Cannot add port 'tty/ttymxc2', unhandled serial type'
> ModemManager[1532]: <debug> [1490186669.774134] [mm-base-modem.c:1485] finalize(): Modem (Generic) '/sys/devices/soc0/soc/2100000.aips-bus/21ec000.serial' completely disposed
> ModemManager[1532]: <warn>  [1490186669.774314] [mm-base-manager.c:158] find_device_support_ready(): Couldn't create modem for device at '/sys/devices/soc0/soc/2100000.aips-bus/21ec000.serial': Failed to find primary AT port
>
> It looks like the ttymxc2 modem port is not QCDM-capable. Is there anything I can do to make it QCDM-capable? The ModemManager software version running on my development board is 1.4.0. Does this make difference?
>

I'm not sure why it didn't re-probe "AT" in the TTY... Please test
"mmcli -S" using ModemManager git master, because a recent patch there
allowed to fully re-probe ports that were not acquired by any modem,
as in your case.

-- 
Aleksander
https://aleksander.es