linux-kernel - Re: musb: am3358: having problem with high-speed on usb1 at peripheral

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Message-ID: <87k2fh8693.fsf@linux.intel.com>
Date:	Tue, 16 Aug 2016 11:31:20 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Ayaka <ayaka@...lik.info>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, b-liu@...com
Subject: Re: musb: am3358: having problem with high-speed on usb1 at peripheral


Hi,

Ayaka <ayaka@...lik.info> writes:
>> ayaka <ayaka@...lik.info> writes:
>>>> On 08/13/2016 01:44 AM, Greg KH wrote:
>>>>> On Sat, Aug 13, 2016 at 12:38:46AM +0800, ayaka wrote:
>>>>> 
>>>>>> On 08/12/2016 03:40 PM, Greg KH wrote:
>>>>>>> On Fri, Aug 12, 2016 at 10:23:15AM +0800, ayaka wrote:
>>>>>>> Hello all:
>>>>>>>    I recently add a support for customize am3358 board using the branch
>>>>>>> processor-sdk-linux-03.00.00 from Ti git. But I meet a problem with musb
>>>>>>> at the peripheral mode.
>>>>>> Then you are going to have to get support from TI for this, nothing we
>>>>>> can do here about random vendor kernel trees, sorry.
>>>>>> 
>>>>>> If you can use the 4.7 tree, or better yet, the 4.8-rc tree, then we
>>>>> I have tried the 4.8-rc1, I meet the same problem.
>>>> What problem is that exactly?
>>> Sorry, the USB1 can't work at high speed gadget mode and have DMA problem.
>>> musb-hdrc musb-hdrc.0.auto: Failed to request rx1.
>>> musb-hdrc musb-hdrc.0.auto: musb_init_controller failed with status -517
>> 
>> -517 is EPROBE_DEFER. Most likely DMA hasn't probed and MUSB is
>> deferring to try later. This does _NOT_ MUSB can't work with
>> DMA. Perhaps you didn't enable support for MUSB's DMA engine.
>> 
> I have set the status of cppi41dma to okay in dts. And CONFIG_USB_TI_CPPI41_DMA,
> CONFIG_TI_CPPI41 and CONFIG_TI_EDMA are enabled with build into kernel.
>
> Anything else I should do?

no, that should do it. Since musb returned -EPROBE_DEFER, it will retry
probing later. Check if musb probed fine. The easiest way is to check if
you have anything in /sys/class/udc/

-- 
balbi

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