linux-kernel - Re: [PATCH 6/7] ARM: OMAP: Disable POSTED mode for errata i103 and i767

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Date:	Tue, 26 Nov 2013 14:05:43 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Joel Fernandes <joelf@...com>
Cc:	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>
Subject: Re: [PATCH 6/7] ARM: OMAP: Disable POSTED mode for errata i103 and
 i767

* Joel Fernandes <joelf@...com> [131125 14:18]:
> On 11/25/2013 04:14 PM, Tony Lindgren wrote:
> > * Joel Fernandes <joelf@...com> [131125 13:46]:
> >> Enabling of Posted mode is seen to cause problems on dmtimer modules on AM33xx
> >> (much like other OMAPs).  Reference discussions on forums [1] [2]. Earlier
> >> patch solving this on other OMAPs [3].
> >>
> >> For OMAP SoCs with this errata, the fix has been to not enable Posted mode.
> >> However, on some SoCs (atleast AM33xx) which carry this errata, Posted mode
> >> is enabled on reset. So we not only need to ignore enabling of the POSTED bit
> >> when the timer is requested, but also disable Posted mode if errata is present.
> > 
> > This could explain some occasional lost timers I saw a while back when
> > testing things.. We most likely should merge for the -rc series with cc stable.
> 
> Sure, I agree.
> 
> > 
> > Does this depend on the other patches in this series?
> > 
> 
> No it doesn't depend.

OK thanks applying into omap-for-v3.13/fixes-take4.

Tony
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