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

[Eddie Huang]

Hi Kevin,

On Tue, 2016-04-19 at 15:57 -0700, Kevin Hilman wrote:
> 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

Old issue. It seems [1] still not in linux-next. After apply, my
mt8173-evb boot to shell successfully.

[1]
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-April/421735.html

Eddie