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

[Kevin Hilman]

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.

Kevin