topic Re: How to create enable USB mass storage device feature on i.MX6 in i.MX Processors

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

krishnanp — Fri, 24 Jan 2014 14:43:49 GMT

Hello there Greetings.

Kernel:3.10.9

Board: i.MX6 Solo based custom board.

Step 1: load the mass storage driver

insmod g_mass_storage.ko file=/dev/mtdblock5

calling msg_init+0x0/0x1c [g_mass_storage] @ 381

initcall msg_init+0x0/0x1c [g_mass_storage] returned -19 after 1549 usecs

insmod: can't insert 'g_mass_storage.ko': No such device

Step 2: dmesg

calling msg_init+0x0/0x1c [g_mass_storage] @ 388

couldn't find an available UDC

initcall msg_init+0x0/0x1c [g_mass_storage] returned -19 after 1606 usecs

calling msg_init+0x0/0x1c [g_mass_storage] @ 389

couldn't find an available UDC

initcall msg_init+0x0/0x1c [g_mass_storage] returned -19 after 1570 usecs

I am stuck with this error. Appreciate any pointers ...

Regards,

Krishnan.

Re: How to create enable USB mass storage device feature on i.MX6

krishnanp — Sat, 25 Jan 2014 13:17:59 GMT

It looks like I have some problem in VBUS configuration. Th USB_OTG_ID pad was left unconnected on the board.

In the dts file i have added below code to enable OTG support.

&usbotg {

vbus-supply = <&reg_usb_otg_vbus>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_usbotg_1>;

disable-over-current;

status = "okay";

};

One more experiment done was compiling g_mass_storage driver statically. But at this time I am not able change the file paramter.

In kernel configuration i have selected below options.

under USB Peripheral Controller

<*> Freescale Highspeed USB DR Peripheral Controller

I have added some debug prints in drivers/usb/gadget/udc-core.c where the probe is happening. It says probe could not find USB device controller driver.

I am little lost how to proceed. Any pointers/help will be much appreciated.

Thanks in advance

Krishnan

Re: How to create enable USB mass storage device feature on i.MX6

krishnanp — Mon, 27 Jan 2014 10:49:43 GMT

Any pointers?

Re: How to create enable USB mass storage device feature on i.MX6

EricNelson — Mon, 27 Jan 2014 22:33:13 GMT

Hi Krishnan,

This may be an issue with the pad configurations for Solo.

We didn't have support for Dual-Lite/Solo in our 3.10.9 release, but USB OTG was supported on i.MX6Q:

http://boundarydevices.com/imx6-linux-kernel-3-10-9/

We have recently tested on 3.10.17, notably on our Nitrogen6_Lite board:

http://boundarydevices.com/mx6-linux-kernel-3-10-17-beta/

You can compare your configuration against nit6xlite_defconfig and your DTS files against
imx6dl-nit6xlite.dts in in this tree:

linux-imx6/arch/arm/boot/dts at boundary-imx_3.10.17_1.0.0_beta · boundarydevices/linux-imx6 · GitHub

We tested using g_ether, not g_mass_storage, but the detection and registration

should be the same.

Re: How to create enable USB mass storage device feature on i.MX6

krishnanp — Thu, 30 Jan 2014 10:45:06 GMT

Dear Eric,

Thanks for the suggestions. It was a problem with UDC controller driver. I have enabled chip idea hdr controller driver in kernel

Now the g_mass_storage works fine

root@imx6qsabrelite:/# insmod g_mass_storage.ko file=/dev/mtdblock5

calling msg_init+0x0/0x1c [g_mass_storage] @ 421

g_mass_storage gadget: Mass Storage Function, version: 2009/09/11

g_mass_storage gadget: Number of LUNs=1

lun0: LUN: file: /dev/mtdblock5

g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11

g_mass_storage gadget: userspace failed to provide iSerialNumber

g_mass_storage gadget: g_mass_storage ready

initcall msg_init+0x0/0x1c [g_mass_storage] returned 0 after 30566 usecs

root@imx6qsabrelite:/# g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage

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

alexkuo — Fri, 17 Aug 2018 06:28:37 GMT

Hello Eric,

I try to establish 1 HID and 1 mass storage at same time.

I already have enabled "ChipIdea Highspeed Dual Role Controller", HID and mass storage features in kernel(menuconfig). But I get an error message "udc-core: couldn't find an available UDC - added [g_mass_storage] to list of pending drivers".

I try to modified core.c but it's not work. I have trawled through many articles with no luck. Does it have efficient way to modify USB descriptor for 1 HID and 1 Mass Storage at same time?

(imx6ull14x14evk-poky-linux-gnueabi\linux-imx\4.9.11-r0\git\drivers\usb\gadget\udc\core.c)

Thank you.

Situation 1:

Step 1: insmod g_hid.ko <======= HID is work normally
Step 2: insmod g_mass_storage.ko <====== show error message
udc-core: couldn't find an available UDC - added [g_mass_storage] to list of pending drivers

Situation 2:
Step 1: insmod g_mass_storage.ko <====== mass storage is work normally
Step 2: insmod g_hid.ko <======= show error message

udc-core: couldn't find an available UDC - added [g_hid] to list of pending drivers

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

marcomadrigal — Fri, 17 Aug 2018 15:00:59 GMT

Hi,

You can not load two gadget drivers simultaneously, for this you need to load them as a composite driver, you can do this through configfs or hardcoded on the legacy drivers.

Regards,

-Marco

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

sandeep_yenugul — Sun, 09 Dec 2018 14:43:01 GMT

Hi,

How did you solved this issue of udc not available.