Re: exynos5422-odroid-xu3: MCPM: only 6 of 8 CPUs coming online

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Joonyoung,

Abhilash looks to be the father of it...
Also I have no idea why I'm appearing as a commiter of that.. as me or
anyone from Hardkernel doesn't have access to that github account or
contributed to it.
I do have a 3.17 branch here locally on my computer but its not public anywhere.

On Wed, Oct 22, 2014 at 11:36 PM, Joonyoung Shim
<jy0922.shim@xxxxxxxxxxx> wrote:
> On 10/23/2014 10:25 AM, Mauro Ribeiro wrote:
>> Joonyoung,
>>
>> This patch was provided by Samsung and if someone can explain is you
>> guys from Samsung.
>> I have no idea of the logics behind this or what it would take to fix it.
>> Keep in mind that our u-boot and kernel (downstream 3.10) is part of
>> Samsung provided BSP.
>> Would be nice if you guys could explain this.
>>
>
> Mauro,
>
> Thanks to reply, do you know author of this patch written by Samsung?
>
>
> To Kukjin,
>
> The patch[1] seems to come from S.LSI guys, could you contact about this?
>
> [1]: https://github.com/abhijeet-dev/linux-samsung/commit/553b7f40465ab4fad6c270f289cd4780942f7fae
>
>>
>>
>> On Wed, Oct 22, 2014 at 11:17 PM, Joonyoung Shim
>> <jy0922.shim@xxxxxxxxxxx> wrote:
>>> Add Cc the patch author and committer from github.
>>>
>>> On 10/23/2014 10:04 AM, Joonyoung Shim wrote:
>>>> Hi,
>>>>
>>>> On 10/17/2014 09:06 PM, Kevin Hilman wrote:
>>>>> On Wed, Oct 15, 2014 at 4:35 AM, Joonyoung Shim <jy0922.shim@xxxxxxxxxxx> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> Kevin Hilman <khilman <at> kernel.org> writes:
>>>>>>
>>>>>>>
>>>>>>> Hi hdmi_resources_init,
>>>>>>>
>>>>>>> Abhilash Kesavan <a.kesavan <at> samsung.com> writes:
>>>>>>>
>>>>>>>> I had noticed a similar issue where only 6 cores would come up during
>>>>>>>> development on 5420. This was because there was a check in our u-boot
>>>>>>>> secondary boot-up path which would put a core into WFI if a flag was
>>>>>>>> not present and hence fail to boot. I wonder if it is the same
>>>>>>>> situation in your case too.
>>>>>>>> Is the u-boot for odroid-xu3 publically available or can you check if
>>>>>> there is any such code present in your
>>>>>>> secondary bring-up path.
>>>>>>>
>>>>>>> I'm using the hardkernel u-boot[1], branch: odroidxu3-v2012.07.  I'm
>>>>>>> currently using the pre-built binaries that are in the
>>>>>>> sd_fuse/hardkernel directory of that branch, but I can rebuild u-boot if
>>>>>>> needed.
>>>>>>>
>>>>>>> I'm not very familiar with u-boot, but if f you have some pointers where
>>>>>>> to start looking in that code, that would be helpful.
>>>>>>>
>>>>>>> Kevin
>>>>>>>
>>>>>>> [1] https://github.com/hardkernel/u-boot.git
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> It seems to need magic code.
>>>>>>
>>>>>> Please refer
>>>>>> https://github.com/abhijeet-dev/linux-samsung/commit/553b7f40465ab4fad6c270f289cd4780942f7fae
>>>>>
>>>>> Thanks, Abhilash had pointed me to the same code, and it works.  But...
>>>>>
>>>>> Can someone explain this "magic", ideally in the form of a changelog
>>>>> and patch submitted upstream?
>>>>>
>>>>
>>>> I also really wonder.
>>>>
>>>> One more problem, cpu0 doesn't boot after offline and system is halted.
>>>>
>>>> # echo 0 > /sys/devices/system/cpu/cpu0/online
>>>> [   28.027852] IRQ152 no longer affine to CPU0
>>>> [   28.028087] IRQ256 no longer affine to CPU0
>>>> [   28.028344] CPU0: shutdown
>>>> #
>>>> # echo 1 > /sys/devices/system/cpu/cpu0/online
>>>>
>>>> So, it's failed script[1] to test MCPM functionalities
>>>>
>>>> Thanks.
>>>>
>>>> [1]: http://www.spinics.net/lists/arm-kernel/msg330946.html
>>>>
>>>
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>>
>
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