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

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Message-ID: <CAGa+x863_MQ22h+U=KtK++3aG2F_X4x57Xtfe16GYXKNiaWX4A@mail.gmail.com>
Date:	Tue, 14 Jan 2014 13:26:09 -0800
From:	Kevin Hilman <khilman@...aro.org>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v2] ARM: OMAP4460: cpuidle: Extend PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD
 on cpuidle

On Fri, Nov 15, 2013 at 8:12 AM, Santosh Shilimkar
<santosh.shilimkar@...com> wrote:
> On Friday 15 November 2013 11:11 AM, Tony Lindgren wrote:
>> * Taras Kondratiuk <taras.kondratiuk@...aro.org> [131115 08:03]:
>>> 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?
>>
>> Oops, sorry looks like I removed it already as I rebuilt the tree
>> and started a new set of randconfig build tests.
>>
>>>> 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.
>>
>> Yes something like that probably. Sounds like that should be then
>> patches before this fix.
>>
>>> Btw, do we need omap_enter_idle_coupled() in UP?
>>
>> That should be checked, am43xx may need it.
>>
> Nope. omap_enter_idle_coupled() is needed only for SMP
> systems. UP don't need couple idle functionality as
> such.

So what's the status of this fix and dependencies?

Both linux-next[1] and arm-soc/for-next[2] are failing boot tests on
omap4460/panda-es because multi_v7_defconfig now has CPUidle enabled
by default.

Kevin

[1] http://lists.linaro.org/pipermail/kernel-build-reports/2014-January/001891.html
[2] http://lists.linaro.org/pipermail/kernel-build-reports/2014-January/001898.html
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