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

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Date:   Tue, 23 Aug 2016 10:17:39 -0500
From:   Bin Liu <b-liu@...com>
To:     Ayaka <ayaka@...lik.info>
CC:     <linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: musb: am3358: having problem with high-speed on usb1 at
 peripheral

Hi,

On Tue, Aug 23, 2016 at 09:57:17AM +0800, Ayaka wrote:
> 
> 
> 從我的 iPad 傳送
> 
> > Bin Liu <b-liu@...com> 於 2016年8月19日 上午12:08 寫道：
> > 
> > Hi,
> > 
> >> 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.
> >>  I have force usb1 in peripheral mode in dts as it only have USB_DP,
> >> USB_DM and USBDRV connected. I start up a ether gadget using the configfs,
> > 
> > Do you mean USB1_DRVVBUS pin? If so, you have wrong hw design. For
> > peripheral mode, you should float this pin, but connect USB1_VBUS pin
> > instead.
> > 
> Thank you very much. After hardware modification, it could work on hi-speed mode now.
> But I wonder it have effect? As the vbus is not used to transmit data in USB?

>From am3358 perspective, USB1_VBUS is an input pin, which is one of the
conditions for musb role switching. More detail is in the am335x TRM.

Regards,
-Bin.

> > Regards,
> > -Bin.
> > 
> >> But I found it would always work on the USB 2.0 full speed mode,
> >> even the testmode can't force it in high speed mode or it won't appear
> >> at host side. If I want it work at high speed mode, what should I do?
> >>  I also meet the DMA problem, I have to apply the "ARM: dts: am33xx: 
> >> fix DMA support for the second USB interface", but does patches really
> >> work? Although it make the error message disapear, but the mail list
> >> said the just make the usb back to PIO mode.
> >> 
> >> -- 
> >> 2.7.4
> >> 
> >> --
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>