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Date:   Tue, 4 Apr 2017 07:18:01 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     John Stultz <john.stultz@...aro.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
CC:     John Youn <John.Youn@...opsys.com>,
        lkml <linux-kernel@...r.kernel.org>,
        YongQin Liu <yongqin.liu@...aro.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: dwc2_hc_chhltd_intr_dma - ChHltd set errors?

Hi,

On 4/4/2017 7:04 AM, John Stultz wrote:
> On Mon, Apr 3, 2017 at 5:54 AM, Minas Harutyunyan
> <Minas.Harutyunyan@...opsys.com> wrote:
>> On 4/3/2017 9:23 AM, John Youn wrote:
>>> On 03/31/2017 04:04 PM, John Stultz wrote:
>>>> On Thu, Mar 2, 2017 at 12:00 PM, John Stultz <john.stultz@...aro.org> wrote:
>>>>> Hey John,
>>>>>   We've noticed that when using usb ethernet adapters on HiKey, we
>>>>> occasionally see errors like:
>>>>>
>>>>> dwc2 f72c0000.usb: dwc2_hc_chhltd_intr_dma: Channel 0 - ChHltd set,
>>>>> but reason is unknown
>>>>> dwc2 f72c0000.usb: hcint 0x00000002, intsts 0x06200029
>>>>>
>>>>> dwc2 f72c0000.usb: dwc2_hc_chhltd_intr_dma: Channel 11 - ChHltd set,
>>>>> but reason is unknown
>>>>> dwc2 f72c0000.usb: hcint 0x00000002, intsts 0x04200029
>>>>>
>>>>> Sometimes followed up by a usb error in the driver, something like:
>>>>> asix 1-1.2:1.0 eth0: asix_rx_fixup() Bad Header Length 0x36000807, offset 68
>>>>>
>>>>> Curious if you've seen any reports like this?
>>
>> The core version is less than 2.71a, am I right?
>
> So it looks like its reporting 0x4f54300a for hsotg->regs + GSNPSID
> which looks like DWC2_CORE_REV_3_00a
>
>> Please send full debug log to do more investigation.
>
> Full dmesg, or is there special debugging you want me to enable?

Full dmesg around issue.
>
>> Also send us regdump after connecting ethernet adapter.
>
> Sorry, can you clarify how to generate this?

cat regdump. To locate dwc2 regdump file: cd /; find -name regdump

>
> thanks
> -john
>

Thanks,
Minas

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