From: Nishanth Menon <nm@ti.com>
To: "Gopinath, Thara" <thara@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"Gulati, Shweta" <shweta.gulati@ti.com>
Subject: Re: [PATCH] OMAP3: PM: Fix for Silicon bug on Context Restore on OMAP3430
Date: Tue, 6 Oct 2009 06:50:28 -0500 [thread overview]
Message-ID: <4ACB2F04.2090608@ti.com> (raw)
In-Reply-To: <5A47E75E594F054BAF48C5E4FC4B92AB030A3321EF@dbde02.ent.ti.com>
Gopinath, Thara had written, on 10/06/2009 01:59 AM, the following:
> The problem here is not with the restore. If MPU reads the PADCONF_SAVEDONE bit very close
> to the end of context save sequence for the pad conf registers, the last context is not
> saved to the scratchpad memory. This is a h/w bug. The workaround proposed is to delay the
> MPU access of SAVEDONE bit until the last context has been saved. 300 us delay is the current
> safe delay proposed by TI. I believe investigations are going on to whether this delay can be
> optimized. Also only the last context (ETK_D14) has the risk of not getting saved.
So, if I were to save specifically the ETK14 and restore it explicitly,
I could in theory work around this issue.
>
> We could add a defconfig option for this workaround and enable it on need basis till TI
> comes out with proper optimized workaround sequence.
we could probably hope to see a final patch then I believe?
Regards,
Nishanth Menon
next prev parent reply other threads:[~2009-10-06 11:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1254741761-31546-1-git-send-email-y>
2009-10-05 11:51 ` [PATCH] OMAP3: PM: Fix for Silicon bug on Context Restore on OMAP3430 Shilimkar, Santosh
2009-10-05 17:04 ` Kevin Hilman
2009-10-05 17:27 ` Nishanth Menon
2009-10-06 6:59 ` Gopinath, Thara
2009-10-06 11:50 ` Nishanth Menon [this message]
2009-10-06 13:17 ` Kevin Hilman
2009-10-06 13:31 ` Gopinath, Thara
2009-10-06 14:20 ` Kevin Hilman
2009-10-06 14:35 ` Gopinath, Thara
2009-10-06 14:49 ` Kevin Hilman
2009-10-06 14:54 ` Gopinath, Thara
2009-10-06 15:05 ` Kevin Hilman
2009-10-06 15:17 ` Nishanth Menon
2009-10-06 15:23 ` Gopinath, Thara
2009-10-06 15:25 ` Nishanth Menon
2009-10-05 11:22 y
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