linux-kernel - Re: [PATCH v7 3/5] usb: dwc3: omap: Don't set POWERPRESENT

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Date:	Tue, 10 May 2016 13:33:51 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Roger Quadros <rogerq@...com>
Cc:	tony@...mide.com, Joao.Pinto@...opsys.com,
	sergei.shtylyov@...entembedded.com, peter.chen@...escale.com,
	jun.li@...escale.com, grygorii.strashko@...com,
	yoshihiro.shimoda.uh@...esas.com, nsekhar@...com, b-liu@...com,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 3/5] usb: dwc3: omap: Don't set POWERPRESENT


Hi,

Roger Quadros <rogerq@...com> writes:
> On 10/05/16 13:04, Felipe Balbi wrote:
>> 
>> Hi,
>> 
>> Roger Quadros <rogerq@...com> writes:
>>> On 10/05/16 12:54, Felipe Balbi wrote:
>>>>
>>>> Hi,
>>>>
>>>> Roger Quadros <rogerq@...com> writes:
>>>>> TRM [1] recommends that POWERPRESENT bit must not be
>>>>> set and left at it's default value of 0.
>>>>>
>>>>> [1] OMAP542x TRM - http://www.ti.com/lit/pdf/swpu249
>>>>> Section 23.11.4.5.1 Mailbox VBUS/ID Management
>>>>>
>>>>> "Because PIPE powerpresent has a different meaning in host and in device mode,
>>>>> and because of the redundancy with the UTMI signals, the controller ORes
>>>>> together the appropriate PIPE and UTMI inputs to create its internal
>>>>> VBUS status. For that reason, it is recommended to leave field
>>>>> USBOTGSS_UTMI_OTG_STATUS[9] POWERPRESENT at its default value (=0), and only to
>>>>> fill in the USB2 VBUS status fields in the same register."
>>>>>
>>>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>>>
>>>> to make sure we avoid regressions, do you mind sharing on which
>>>> platforms you tested this patch ?
>>>>
>>> I tested this on omap5-uevm and dra7-evm.
>>> My am437x board stopped working so couldn't test on that one.
>> 
>> would you have a colleague or perhaps an automated test-farm which could
>> run the test for you ? :-)
>> 
>> I can take the patch, no problem, but if there are any regressions don't
>> blame me :-)
>> 
> Don't worry, blame is on the TRM then :).

alright then, so seems like v8 will be queued. Just remember we're
pretty close to opening the merge window and I have already sent a pull
request to Greg. On the bright side, your patches will sit in linux-next
for quite some time :-) (well, until -rc1 is tagged)

-- 
balbi

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