linux-kernel - Re: [PATCH 1/1] mfd: omap-usb-host: Fix USB device detection problems on OMAP4 Panda

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Date:	Mon, 02 Dec 2013 13:01:51 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Roger Quadros <rogerq@...com>
CC:	Michael Trimarchi <michael@...rulasolutions.com>,
	Felipe Balbi <balbi@...com>, lee.jones@...aro.org,
	sameo@...ux.intel.com, tomi.valkeinen@...com,
	Stefan Roese <sr@...x.de>, ljkenny.mailinglists@...il.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mfd: omap-usb-host: Fix USB device detection problems
 on OMAP4 Panda

- stable@...r.kernel.org since they probably don't care about this
  unless the patch is merged.

On 12/02/2013 10:41 AM, Roger Quadros wrote:
> Michael,
> 
> On 11/29/2013 05:32 PM, Michael Trimarchi wrote:
>> Hi Roger
>>
>> On Fri, Nov 29, 2013 at 2:01 PM, Roger Quadros <rogerq@...com> wrote:
>>> With u-boot 2013.10, USB devices are sometimes not detected
>>> on OMAP4 Panda. To make us independent of what bootloader does
>>> with the USB Host module, we must RESET it to get it to a known
>>> good state. This patch Soft RESETs the USB Host module.
>>>
>>
>> Do you think that we need something similar of usb musb?
>> I have seen the OTG_SYSCONFIG is touched in uboot and
>> only readed in omap2430.c.
> 
> I'm not sure about musb. Maybe Sebastian/Felipe have better idea.
> In general I believe that all modules must be reset by the kernel.
> 

based on the code at the bottom it touches the first few register(s)
sysconfig. Isn't hwmod actually doing this idle stuff and resting the
device during boot?

> cheers,
> -roger
>>

Sebastian
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