linux-kernel - Re: [PATCH v2] ARM: OMAP4460: cpuidle: Extend PM_OMAP4_ROM_SMP_BOOT_ERRATUM

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Message-ID: <52864585.6030206@linaro.org>
Date:	Fri, 15 Nov 2013 18:02:13 +0200
From:	Taras Kondratiuk <taras.kondratiuk@...aro.org>
To:	Tony Lindgren <tony@...mide.com>,
	Grygorii Strashko <grygorii.strashko@...com>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	open list <linux-kernel@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] ARM: OMAP4460: cpuidle: Extend PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD
 on cpuidle

On 11/15/2013 05:36 PM, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [131114 10:36]:
>> * Grygorii Strashko <grygorii.strashko@...com> [131022 12:09]:
>>> The same workaround as ff999b8a0983ee15668394ed49e38d3568fc6859
>>> "ARM: OMAP4460: Workaround for ROM bug because of CA9 r2pX GIC ..."
>>> need to be applied not only when system is booting, but when MPUSS hits
>>> OSWR state through CPUIdle too. Without this WA the same issue is
>>> reproduced now on boards PandaES and Tablet/Blaze with SOM OMAP4460
>>> when CONFIG_CPU_IDLE is enabled.
>>> After MPUSS has enterred OSWR and waken up:
>>> - GIC distributor became disabled forever
>>> - scheduling is not performed any more
>>>
>>> Cc: Kevin Hilman <khilman@...aro.org>
>>> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>>> Reported-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>
>>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>>
>> Applying into omap-for-v3.13/fixes thanks.
> 
> Hmm looks like this breaks the build with randconfigs at least
> with the attached .config, so dropping for now.

Hi Tony
Have you forgot to attach .config?

> arch/arm/mach-omap2/built-in.o: In function `omap_enter_idle_coupled':
> :(.text+0xb48c): undefined reference to `pm44xx_errata'

I assume that .config doesn't have CONFIG_SMP enabled while
pm44xx_errata is defined in omap-smp.c.
I think it should be a separate patch to move pm44xx_errata somewhere
else, so this patch will remain the same.

Btw, do we need omap_enter_idle_coupled() in UP?

-- 
Taras Kondratiuk
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