[PATCH 1/2] ARM: EXYNOS: Support Suspend-to-RAM on EXYNOS5420

[sunil joshi]

Hi Abhilash,

On Fri, Dec 20, 2013 at 5:08 PM, Abhilash Kesavan
<kesavan.abhilash at gmail.com> wrote:
> Hi Sunil,
>
> On Fri, Dec 20, 2013 at 3:56 PM, sunil joshi <sjoshi.open at gmail.com> wrote:
>> Hi Abhilash,
>> I saw another patch in chrome tree ..by Andrew Bresticker
>> which may be relevant here ..
>>
>> Just wondering if you missed adding this ? or this is not needed ?
>> You did not face any issue in getting core to suspend ?
>
> This has not been added for Exynos5250 in mainline yet. We did notice
> that the system would fail to suspend on the rare occasion (~1% of the
> time on exynos5250) when we repeatedly suspended and resumed the
> system.
>
> I have not run s2r stress tests, but have had no issues suspending the
> system in my limited testing. We can probably let this be for now as
> the system would resume fine even on a failed suspend. I will do some
> stress testing and then post if needed.
>>

Ok. Sure .. Thanks for details !

>> ------------------------------------------------------------------------------------------
>> commit 95402d816b9f1a05ce633f7ff64b4c939c142482
>> Author: Andrew Bresticker <abrestic at chromium.org>
>> Date:   Mon Jul 15 13:14:36 2013 -0700
>>
>>     arm: exynos: disable all interrupts on Exynos5420 before suspend
>>
>>     Disable all interrupts from the GIC before entering suspend on
>>     Exynos5420 as is done on Exynos5250.  If interrupts are enabled, we
>>     may receive an interrupt after entering WFI but before the PMU has
>>     suspended the system, causing suspend to fail.
>>
>>     BUG=chrome-os-partner:20523
>>     TEST=Run suspend_stress_test on Pit and observe that entering suspend
>>     no longer occasionally fails with the "Failed to suspend the system"
>>     error in exynos_cpu_suspend().
>>
>>     Change-Id: Ia2d963191f4e5485beb295b28f128f2ce256f987
>>     Signed-off-by: Andrew Bresticker <abrestic at chromium.org>
>>     Reviewed-on: https://gerrit.chromium.org/gerrit/61948
>>     Reviewed-by: Simon Glass <sjg at chromium.org>
>>
>
> Regards,
> Abhilash
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