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

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Message-ID: <874ma6i5zi.fsf@linux.intel.com>
Date:	Tue, 10 May 2016 13:04:33 +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 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 :-)

-- 
balbi

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