mt8173-evb: failing to boot in linux-next and mainline

[Kevin Hilman]

On Thu, Apr 14, 2016 at 2:58 PM, Kevin Hilman <khilman at baylibre.com> wrote:
> On Wed, Apr 13, 2016 at 3:15 AM, Matthias Brugger
> <matthias.bgg at gmail.com> wrote:
>>
>>
>> On 12/04/16 01:12, Kevin Hilman wrote:
>>>
>>> On Mon, Mar 28, 2016 at 10:40 PM, James Liao <jamesjj.liao at mediatek.com>
>>> wrote:
>>>>
>>>> Hi Sascha,
>>>>
>>>> On Mon, 2016-03-28 at 08:15 -0700, Kevin Hilman wrote:
>>>>>
>>>>> Hi Eddie,
>>>>>
>>>>> Eddie Huang <eddie.huang at mediatek.com> writes:
>>>>>
>>>>> [...]
>>>>>
>>>>>> Thanks your testing again. I can reproduce your case in my local
>>>>>> environment using 4.6-rc1. After checking, there are two ways to avoid
>>>>>> the hang:
>>>>>> 1. set clk_ignore_unused to kernel command line
>>>>>> 2. Revert patch "cc8ed76 soc: mediatek: SCPSYS: Fix double enabling of
>>>>>> regulators"
>>>>>>
>>>>>> It seems there is a problem between turn on/off clock and power domain.
>>>>>> We will try to fix this and send patch to public once have a solution.
>>>>>
>>>>>
>>>>> Thanks for verifying.
>>>>>
>>>>> I've confirmed that reverting the patch suggested above fixes the
>>>>> problem.
>>>>>
>>>>> Since -rc1 is out, and this problem still exists in mainline, if a
>>>>> proper fix is not found very soon, I suggest reverting that patch in
>>>>> mainline.
>>>>>
>>>>> Kevin
>>>>
>>>>
>>>> According to Eddie and Kevin's test, I think some clocks
>>>> (mm/mfg/venc/venclt) may be turned off and there are drivers need these
>>>> clocks without clk_prepare_enable(). But I have no idea to find out what
>>>> driver causes this issue. So I prefer to revert it on v4.6-rc1. Do you
>>>> have comments about this issue?
>>>
>>>
>>> FYI... mt8173-evb is still failing in mainline v4.6-rc3:
>>>
>>>     https://kernelci.org/boot/all/job/mainline/kernel/v4.6-rc3/
>>>
>>> please fix and/or revert ASAP so this boot regression is not in v4.6
>>> final.
>>>
>>
>> Sorry for the late reply. I'm quite busy in my day job ATM.
>> I just send the revert James proposed as fix.
>>
>
> Thanks, I just tried your branch with arm-soc/for-next and mt8173-evb
> is booting again.  Thanks.

FYI... mt8173-evb still failing in linux-next, and not sure if it's a
new issue or not.

https://kernelci.org/boot/mt8173-evb/job/next/kernel/next-20160419/defconfig/defconfig/lab/lab-khilman/?_id=57163f9459b514ffc46e78d72