Re: omap4 ehci sporadic resume issue

[Michael Trimarchi <michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>]

Hi Roger

On 07/02/2013 04:42 PM, Roger Quadros wrote:
> On 06/28/2013 07:47 PM, Michael Trimarchi wrote:
>> Hi
>>
>> On Fri, Jun 28, 2013 at 02:46:11PM +0300, Roger Quadros wrote:
>>> On 06/28/2013 02:33 PM, Michael Trimarchi wrote:
>>>> Hi Roger
>>>>
>>>> On Thu, Jun 27, 2013 at 11:07:11PM +0300, Ruslan Bilovol wrote:
>>>>> On Thu, Jun 27, 2013 at 10:24 PM, Michael Trimarchi
>>>>> <michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org> wrote:
>>>
>>>>> Do you have locks around this software workaround?
>>>>> The patch I did against 3.4 linux kernel may be helpful for
>>>>> you in such case: http://review.omapzoom.org/28515
>>>>> Another patch extends this WA for all OMAP4 SoCs:
>>>>> http://review.omapzoom.org/31108
>>>>
>>>> I'm testing using pm_test and stop to core (5ms and not 5 seconds) (usb suspend cycle are done correctly) so
>>>> the problem could be:
>>>>
>>>> 1) SAR usb context restore. I have applied the SAR workaround but the core doesn't go in full retantion
>>>> could be it a problem?
>>>
>>> If core doesn't go in to OFF then SAR will not come into play. Are you still affected by the
>>> issue if OFF mode is disabled? If yes then it probably is not related to SAR.
>>>
>>>>
>>>> 2) idle status of ulpis pins?
>>>
>>> Yes this can be possible.
>>>
>>> When you said earlier that the problem doesn't happen when one of the ULPIs is used
>>> did you try both of them individually. e.g. case 1: port 1 only enabled,
>>> case 2: port 2 only enabled.
>>>
>>> Did it work in both the cases?
>>
>> Yes, so I don't think could be a problem of ulpi pins and why this happen
>> on both at the same time? Seems more connected to somenthing else.
>>
> 
> Right. Seems to be related to two things. OFF Mode and 2 ports being used simultaneously.
> 
> I'm not sure how to go about fixing this. How important is OFF Mode for your application.
> Can you keep it always disabled?
> 

Right now I delivery without off mode. I will try to fix in long run the usb and I think that it could be a good platform to test omap4 mainline.

Last question:
If one domain is in RET mode and not OFF mode what happen during SAR restore in OFF mode?


Michael


> cheers,
> -roger
> 
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