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

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Message-ID: <5293CC93.6040603@ti.com>
Date:	Mon, 25 Nov 2013 16:17:55 -0600
From:	Joel Fernandes <joelf@...com>
To:	Tony Lindgren <tony@...mide.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

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.


thanks,

-Joel
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