imx6 HSIC usb2 probe hang

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imx6 HSIC usb2 probe hang

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Contributor II

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

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1 Solution
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Contributor I

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

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3 Replies
17 Views
Contributor I

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

View solution in original post

16 Views
Contributor II

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.

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NXP Employee
NXP Employee

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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