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

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Date:	Tue, 14 Sep 2010 20:54:22 +0530
From:	venki kaps <venkiece2005@...il.com>
To:	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

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).,

Thanks in advance.

> Best Regards,
> Venkii
>
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