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

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Message-ID: <680379fb-52ac-a717-0657-dd60911f8276@soulik.info>
Date:	Tue, 16 Aug 2016 22:05:00 +0800
From:	ayaka <ayaka@...lik.info>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
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



On 08/16/2016 04:31 PM, Felipe Balbi wrote:
> 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/
Yes, it has musb-hdrc.0.auto. But it doesn't mean that it fallback PIO mode?
Actually I don't care whether it use PIO or DMA, I just can't bear it 
work in USB 2.0 Full Speed mode, too slow.
>