imx6 - USB OTG device testing

[Ansari]

Dear support team,

We are using imx6Q sabresd platform for our development with Linux 3.10.17_1.0.0-GA BSP.
 
We need to test the USB OTG as a device.  For the same we tried to insert the mass storage driver in the kernel.   We are not able to test the USB OTG as device.
I have copied the error log here for your reference.

root@imx6qsabresd:~# insmod g_mass_storage.ko file=/dev/mmcblk1p1
g_mass_storage: Unknown symbol usb_interface_id (err 0)
g_mass_storage: Unknown symbol usb_assign_descriptors (err 0)
g_mass_storage: Unknown symbol usb_string_id (err 0)
g_mass_storage: Unknown symbol usb_string_ids_tab (err 0)
g_mass_storage: Unknown symbol usb_composite_unregister (err 0)
g_mass_storage: Unknown symbol config_ep_by_speed (err 0)
g_mass_storage: Unknown symbol usb_add_function (err 0)
g_mass_storage: Unknown symbol usb_composite_probe (err 0)
g_mass_storage: Unknown symbol usb_composite_overwrite_options (err 0)
g_mass_storage: Unknown symbol usb_composite_setup_continue (err 0)
g_mass_storage: Unknown symbol usb_ep_autoconfig (err 0)
g_mass_storage: Unknown symbol usb_add_config (err 0)
g_mass_storage: Unknown symbol usb_free_all_descriptors (err 0)
insmod: ERROR: could not insert module g_mass_storage.ko: Unknown symbol in module


Please help us to test the same.  In case, If we do wrong suggest us.



Thank You,
Regards,
Ansari

[igorpadykov]

Hi Abdul

I would suggest to check if correct usb connector was used (for Device mode

with ID signal high or float) and look at link below

Issue with USB OTG in device mode with mass storage gadget driver in i.MX6

Best regards

chip

[Ansari]

Dear Chip,

Thanks for your input.  Please find our test cases as below,

Case1:

======

I downloaded the binaries from the below mentioned link and tested USB OTG as device with this downloaded binaries and result is same.

https://www.freescale.com/webapp/sps/download/license.jsp?colCode=L3.10.17_1.0.0_IMX6QDLS_BUNDLE&app...

Commands used to test USB OTG as device:

insmod /lib/modules/3.10.17-1.0.0_ga+g232293e/kernel/drivers/usb/gadget

t/g_mass_storage.ko file=/dev/mmcblk1p2

Case 2:

======

Compile the Linux kernel source code (linux-3.10.17 GA release) using the following commands to generate the binaries.

    make imx_v7_defconfig;make;make uImage LOADADDR=0x10800000

Tested the OTG with the generated uImage and module(drivers/usb/gadget/g_mass_storage.ko). The result is same.

Case 3:

======

Checked the below link for this issue but with out any success.

https://community.freescale.com/message/433234#433234 

The link suggested for enabling the macro USB_CHIPIDEA_UDC (ChipIdea device controller) which was already enabled.

In addition,  We are using imx6Q sabreSD board for testing.

We assume that the driver module (g_mass_storage.ko) can be inserted with out connecting the USB OTG device cable.  Here our problem is driver module itself not able to insert.

Please suggest us.

Thank You,

Regards,

Ansari

[igorpadykov]

Hi Abdul

then what is about modprobe, is it working ?

$ modprobe g_mass_storage file=./backing_file

there are unit tests (imx-test-3.10.17-1.0.0) in demo images, it

hold all module tests.

Best regards

chip

[Ansari]

Hi Chip,

Thanks for your input.

The below command not giving any error and the mass storage device is not connected to the host PC.

$modprobe g_mass_storage file=/dev/mmcblk1p1

In addition, we are getting below prints when we connect/remove the USB OTG device cable with host PC.

root@imx6qdlsolo:~# max8903-charger max8903.18: USB Charger Connected.

max8903-charger max8903.18: USB Charger Disconnected.

Let us check once with "unit_tests" module test.

Thank You,

Regards,

Ansari

[bertrandmarquis]

Hi,

We are using a Sabre SD board and try to make the USB Gadget running and we have the same message coming out on the console:

max8903-charger max8903.18: USB Charger Connected.

max8903-charger max8903.18: USB Charger Disconnected.

On the PC connected to the target we have a device detected but after a second we have a disconnected message on "dmesg" and over and over the device gets connected and disconnected on the host PC. During the interval we manage to mount what we exported through USB from the device but we get disconnected.

We also have a sabre Lite board and using the same image (with the appropriate DTB) the problem is not happening.

We are using the last git version of linux 3.10

Any idea where this is coming from and how to solve it ?

Thanks

Bertrand

[Ansari]

Hi chip,

We are waiting for your valuable input on this issue.

Thank You,

Regards,

Ansari

[igorpadykov]

what is about settings

CONFIG_USB_CHIPIDEA

CONFIG_USB_GADGET

CONFIG_USB_MXS_PHY

~igor

[Ansari]

Hi Igor,

The below configurations are enabled in the Linux kernel by default.

CONFIG_USB_CHIPIDEA

CONFIG_USB_GADGET

CONFIG_USB_MXS_PHY

Thank You,

Regards,

Ansari

[igorpadykov]

Hi Ansari

please check link below

https://github.com/rabeeh/android-imx6-kitkat/blob/master/platform/external/linux-test.git/0301-ENGR...

just for example it has build settings as below:

CONFIG_USB_HID=m

CONFIG_USB_HIDINPUT = y

what settings below in your build : ?

CONFIG_USB_CHIPIDEA

CONFIG_USB_GADGET

CONFIG_USB_MXS_PHY

~igor

[Ansari]

Hi Igor,

We have not changed the Linux kernel source code and the kernel configuration file.  we have executed below command to configure the kernel (which is default)

$make imx_v7_defconfig

With this default configuration,  find the below settings of the kernel configuration

CONFIG_USB_CHIPIDEA = y

CONFIG_USB_GADGET = y

CONFIG_USB_MXS_PHY = y

Thanks You,

Regards,

Ansari

[igorpadykov]

you can try to change

y --> m

and check

~igor

[Ansari]

Hi Igor,

Thanks for your input.

We have changed the configuration as mentioned below.  But the result same.

CONFIG_USB_CHIPIDEA = m

CONFIG_USB_GADGET = m

CONFIG_USB_MXS_PHY = m

Please find the command executed and the following error.

root@imx6qsabresd:~#insmod  g_mass_sotrage.ko file=/dev/mmcblk1p1
g_mass_storage: Unknown symbol usb_interface_id (err 0)
g_mass_storage: Unknown symbol usb_assign_descriptors (err 0)
g_mass_storage: Unknown symbol usb_string_id (err 0)
g_mass_storage: Unknown symbol usb_string_ids_tab (err 0)
g_mass_storage: Unknown symbol usb_composite_unregister (err 0)
g_mass_storage: Unknown symbol config_ep_by_speed (err 0)
g_mass_storage: Unknown symbol usb_add_function (err 0)
g_mass_storage: Unknown symbol usb_composite_probe (err 0)
g_mass_storage: Unknown symbol usb_composite_overwrite_options (err 0)
g_mass_storage: Unknown symbol usb_composite_setup_continue (err 0)
g_mass_storage: Unknown symbol usb_ep_autoconfig (err 0)
g_mass_storage: Unknown symbol usb_add_config (err 0)
g_mass_storage: Unknown symbol usb_free_all_descriptors (err 0)
insmod: ERROR: could not insert module g_mass_storage.ko: Unknown symbol in module

Thank You,

Regards,

Ansari

[Ansari · Accepted solution]

Hi Igor,

We are able to successfully insert the g_mass_storage.ko file without changing the default kernel configuration (imx_v7_defconfig).

The steps are below

/lib/modules/3.10.17-1.0.0_ga+g2a69800/kernel/$insmod fs/configfs/configfs.ko

/lib/modules/3.10.17-1.0.0_ga+g2a69800/kernel/$insmod drivers/usb/gadget/libcomposite.ko

/lib/modules/3.10.17-1.0.0_ga+g2a69800/kernel/$insmod drivers/usb/gadget/g_mass_storage.ko

Thank You,

Regards,

Ansari