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

[Joonyoung Shim <jy0922.shim@samsung.com>]

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@samsung.com> 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@samsung.com> 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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>