linux-kernel - Re: OMAP3 DSP MMU fault + off mode issue

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Message-ID: <87mxrjgjre.fsf@deeprootsystems.com>
Date:	Wed, 15 Sep 2010 07:32:21 -0700
From:	Kevin Hilman <khilman@...prootsystems.com>
To:	venki kaps <venkiece2005@...il.com>
Cc:	omar.ramirez@...com, h-kanigeri2@...com, ameya.palande@...ia.com,
	fernando.lugo@...com, x0hebbar@...com, ernesto@...com,
	felipe.contreras@...il.com, s-anna@...com, grgupta@...com,
	ivan.gomez@...com, ext-andriy.shevchenko@...ia.com,
	x0095078@...com, deepak.chitriki@...com, nm@...com,
	ext-phil.2.carmody@...ia.com, ohad@...ery.com,
	devel@...uxdriverproject.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: OMAP3 DSP MMU fault + off mode issue

venki kaps <venkiece2005@...il.com> writes:

> On Tue, Sep 14, 2010 at 8:54 PM, venki kaps <venkiece2005@...il.com> wrote:
>> On Tue, Sep 14, 2010 at 1:28 AM, venki kaps <venkiece2005@...il.com> wrote:
>>> Dear all,
>>>
>>> I have been facing an issue with OMAP3 PM with DSP MMU Fault (Kernel 2.6.32).
>>>
>>> The issue is describing as below mentioned way,
>>>        1). The Device is getting DSP MMU Fault when playing MP4 video clip.
>>>
>>> The system is not hitting off mode in the below scenario,
>>>        2). System boot ->play mp4 clip ->DSP MMU Fault -> allow off
>>> mode -----------> Never hits off mode
>>>
>>> But surprisingly the system is hitting off mode in the below scenario,
>>>       3). System boot ->allow off mode ->play mp4 clip ->DSP MMU
>>> Fault -> allow off mode -----------> perfectly works
>>>
>>>
>>>  - Could you please describe the root cause about the above issues 1 & 2?
>>>  - How could solve the above issues?
>>
>> I have found the issue with UART3.
>> In System configuration register (SYSC),-
>>             IDLEMODE  - Smart idle -------> working scenario  ------>
>> system hits off mode.
>>             IDLEMODE  - No idle -------> Non working scenario
>> ------> system never hits off mode.
>>
>> Could you please explain why UART3 is not able to hit smart idle after
>> DSP MMU fault ( System boot ->play mp4 clip ->DSP MMU Fault -> allow
>> off -----------> Never hits off mode).,
>
> My problem is resolved.GPtimer7 was not reset during the MMU FAULT
> occurrence before the first power cycle.
> So this pending interrupt is preventing the system sleep entry.
> Now it works fine after resetting Gptimer7 in pm suspend path.

Sounds like a patch is needed for DSPBridge who manages that timer.

Kevin
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