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Carlos,

Can you try a hub with 2x one port serial-to-usb converter ? It gives the same error ...

I have attached an image to be clear the setup that we are using.

On pastebin [1] is the output from lsusb -t and lsusb -v.

[1] - http://pastebin.com/1q9PPjjW

Thanks

Aníbal

Carlos,

you were able to  get the same behavior ?

Thanks.

Regards,

Aníbal

Anibal,

I tried with 2 usb serial adapters and they are detected but apparently a new serial port node is not created because the kernel does not have the drivers for them.

root@am180x-evm:~# lsusb -t
2-1.1:1.0: No such file or directory
2-1.2:1.0: No such file or directory
/: Bus 02.Port 1: Dev 1, class="root_hub", Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, class="hub", Driver=hub/4p, 480M
|__ Port 1: Dev 5, If 0, class="vend"., Driver=, 12M
|__ Port 2: Dev 6, If 0, class="vend"., Driver=, 12M
/: Bus 01.Port 1: Dev 1, class="root_hub", Driver=ohci/1p, 12M
root@am180x-evm:~# lsusb
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 002 Device 005: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 002 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
root@am180x-evm:~#

root@am180x-evm:~# find /lib/modules/3.3.0/ -name pl2303

I will try to build another image with pl2303 support.

Carlos

Anibal,

I was able to reproduce the problem. I will pass the information to the kernel dev team.

See logs and procedure below:

am180x-evm login: root
root@am180x-evm:~# lsusb
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
root@am180x-evm:~#
root@am180x-evm:~# insmod /lib/modules/3.3.0/kernel/drivers/usb/gadget/g_ether.k
o
gadget: using random self ethernet address
gadget: using random host ethernet address
usb0: MAC c2:d8:0a:bd:43:c3
usb0: HOST MAC c2:41:be:6b:a1:bb
gadget: Ethernet Gadget, version: Memorial Day 2008
gadget: g_ether ready
musb-hdrc musb-hdrc: MUSB HDRC host driver
musb-hdrc musb-hdrc: new USB bus registered, assigned bus number 2
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
root@am180x-evm:~# usb 2-1: new high-speed USB device number 2 using musb-hdrc
ADDRCONF(NETDEV_UP): usb0: link is not ready
hub 2-1:1.0: USB hub found
hub 2-1:1.0: 4 ports detected
usb 2-1.1: new full-speed USB device number 3 using musb-hdrc
pl2303 2-1.1:1.0: pl2303 converter detected
usb 2-1.1: pl2303 converter now attached to ttyUSB0
usb 2-1.2: new full-speed USB device number 4 using musb-hdrc
pl2303 2-1.2:1.0: pl2303 converter detected
usb 2-1.2: pl2303 converter now attached to ttyUSB1

root@am180x-evm:~# lsusb -t
/: Bus 02.Port 1: Dev 1, class="root_hub", Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, class="hub", Driver=hub/4p, 480M
|__ Port 1: Dev 3, If 0, class="vend"., Driver=pl2303, 12M
|__ Port 2: Dev 4, If 0, class="vend"., Driver=pl2303, 12M
/: Bus 01.Port 1: Dev 1, class="root_hub", Driver=ohci/1p, 12M
root@am180x-evm:~#

Open telnet session and open microcom on /dev/ttyUSB0:

root@am180x-evm:~# microcom -s 115200 /dev/ttyUSB0

Open another telnet session and open microcom on /dev/ttyUSB1:

root@am180x-evm:~# microcom -s 115200 /dev/ttyUSB1
microcom: can't open '/dev/ttyUSB1': Input/output error
root@am180x-evm:~#

Also as you pointed out the following message is shown on the console:

root@am180x-evm:~# pl2303 ttyUSB1: pl2303_open - failed submitting interrupt urb, error -28

Regards,

Carlos 

Carlos,

its the same error that I have.

If you need any help testing or validate the modifications, just ask.

Thanks.

Regards,

Aníbal

Carlos,

any update ? Anyone have an idea why this happen ? It there a solution or a quick fix for this ?

Thanks.

Regards,

Aníbal

hi team,

do we have any update regarding this issue, we need support asap since it has a deep impact on end customers, thanks a lot.

Hi

Please find the interrupt ep scheduling patch 3.x kernel and available at arago link at http://arago-project.org/git/projects/?p=linux-davinci.git;a=commit;h=2432b15edbd0ee4a7f274a215698a408c1b6522f .  This feature will help to connect more interrupt devices on musb controller which has limited number of eps.

Make sure to enable "CONFIG_MUSB_SCHEDULE_INTR_EP" feature through Menuconfig.

Menuconfig->"Device Drivers"->"USB Support"

Regards

Ravi B

Hi

Hope this patch will resolve the issue you are observing.

Regards

Ravi B

Hi,

I have some good news and some bad news.


Good news:

My previous test of connecting a hub to the OMAP L138 EVM and then connecting 2 usb2serial to the hub did not return any error and worked as expected.
I also tried the same test with DMA using CPP4.1 and in PIO mode. Both tests were succesful.


Bad news:

When I did the test using DMA CPP4.1, althought it worked as expected, when I remove the device it is not properly disconnected, and no message appear on DMESG. After that, the usb stops working until I reboot the EVM. This problem does not occur in PIO mode.

I tried a different test were I plugged a SMSC lan9512 EVM in PIO mode, and I get this error:
root@arago:~# usb 2-1: new high-speed USB device number 2 using musb-hdrc
hub 2-1:1.0: USB hub found
hub 2-1:1.0: config failed, can't read hub descriptor (err -22)

and then the usb stops working.

If I plug the SMSC lan9512 EVM with USB in DMA CPP4.1, I get this error:
root@arago:~# usb 2-1: new high-speed USB device number 2 using musb-hdrc
usb 2-1: device not accepting address 2, error -71
usb 2-1: new high-speed USB device number 3 using musb-hdrc
usb 2-1: device not accepting address 3, error -71
usb 2-1: new high-speed USB device number 4 using musb-hdrc
usb 2-1: device descriptor read/8, error -32
usb 2-1: can't set config #1, error -71

and then the usb stops working, like when I use PIO mode.

Please note that the SMSC lan9512 has driver support on the kernel, I just had to enable it, like I did for the usb to serial converters.

Regards,
Aníbal

Hello team, could you please provide some feedback about this post? It is pending for almost 2 months... Thanks, Beatriz.