How to get MX6 USB host 2 working?

[yan2]

Hi All,

I am looking for any help with USB host 2 of the i.MX6DL.

While USB host 1 and USB OTG both work fine, it seems that USB hosts 2 and 3 are not supported by mainline linux kernel (4.9.20 or newer). Here's what I get:

[    1.913802] imx_usb: probe of 2184400.usb failed with error -22

I've found several threads with patches that could help, but most of them are very old (pre device tree).

One problem are the missing accesses to the non core usb registers, so I've tried to add them in usbmisc_imx6q_init of usbmisc_imx.c.

But as long as probing fails I don't get there.

Any idea where I can find information beyond what is easy to find?

Thanks,

Michael

[yan2]

Hi Igor,

USB driver files in

linux-imx.git - i.MX Linux Kernel 

are different from those in current BSP!

I'll give it a try.

Thanks,
Michael

[yan2]

Hi Igor,

Thanks for your response.

The thread

imx6: usbhc2/3 and HSIC 

is the one I've tried to reproduce as far as possible. But it is for 3.10, and if you follow it, they didn't succeed...

I've checked NXP's current BSP (4.9.11) also, but it seems to me that USB host 2 and 3 are not supported there too. At least I can't find the accesses to the non core usb registers, and without the activation of the clocks host 2 and 3 won't work.

Any other idea?

Best Regards,

Michael

[igorpadykov · Accepted solution]

Hi Michael

one can follow usb device tree documentation

imx_4.9.11_1.0.0_ga/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt

linux-imx.git - i.MX Linux Kernel 

usbh2 example in linux/arch/arm/boot/dts/imx6q-arm2-hsic.dts

linux-imx.git - i.MX Linux Kernel 

and debug it in drivers/usb/chipidea/ci_hdrc_imx.c

Best regards
igor

[igorpadykov]

Hi Michael

one can look on

imx6: usbhc2/3 and HSIC 

and NXP BSPs described on

https://www.nxp.com/support/developer-resources/run-time-software/i.mx-developer-resources/i.mx-6ser...

Best regards
igor
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