imx6 HSIC usb2 probe hang

[andreacollamati]

Hi All,

we are porting the imx_3.14.28_1.0.0_ga kernel on a  custom board based on a imx6dl processor.

On our board we connected the USB2 HSIC port to a microchip USB3503 HSIC HUB.

We attached our device tree.

The kernel hangs during the probe of usbhc2 inside the ci_hdrc_imx_probe.

Using kgdb we found  that the exact point is the call of device_add:

ci_hdrc_imx_probe -> ci_hdrc_imx_probe -> ci_hdrc_add_device   -> platform_device_add -> device_add

Do you have any suggestions?

Best Regards

            Andrea

Original Attachment has been moved to: devicetree.dts.zip

[sagar_jariwala · Accepted solution]

Hello Andrea,

I have had the similar problem described by you. I was able to fix this issue with following changes.

Please review your changes against patch mentioned here. Re: imx6: usbhc2/3 and HSIC — ARM, OMAP, Xscale Linux Kernel

Changes in /drivers/usb/chipidea/usbmisc_imx.c are important to fix this hang issue.

It helped me resolve my hang issue. I hope it helps you as well.

Thanks,
Sagar

[andreacollamati]

Thank you very much Sagar.

It worked!

You are right the most important part is the patch inside /drivers/usb/chipidea/usbmisc_imx.c

+ if (usbdev->index == 2 || usbdev->index == 3) {

     + writel(0x00003000, usbmisc->base + usbdev->index * 4);

     + writel(0x80001842, usbmisc->base + 0x8 + usbdev->index * 4);

+ }

that enables the HSIC clock and HW and write also in reserved control bits...

Thank you again.

[CarlosCasillas]

Hi Andrea,

HSIC is supported in i.MX6 BSPs; please refer to attached i.MX6 Linux Reference Manual

Chapter 34 "ARC USB Driver" and <usb_hsic_xcvr.c> “HSIC featured phy's interface”.

Additionally, please take a look at the following thread which has related information:

HSIC under linux (imx6d)

Hope this will be useful for you.
Best regards!
/Carlos

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