[linux-sunxi] [PATCH v2 3/6] ARM: sun4i: Convert to CCU

[Priit Laes]

On Tue, Dec 12, 2017 at 01:24:52PM -0800, Kevin Hilman wrote:
> On Tue, Dec 12, 2017 at 9:26 AM, Priit Laes <plaes at plaes.org> wrote:
> > On Mon, Dec 11, 2017 at 02:22:30PM -0800, Kevin Hilman wrote:
> >> On Sun, Mar 26, 2017 at 10:20 AM, Priit Laes <plaes at plaes.org> wrote:
> >> > Convert sun4i-a10.dtsi to new CCU driver.
> >> >
> >> > Signed-off-by: Priit Laes <plaes at plaes.org>
> >>
> >> I finally got around to bisecting a mainline boot failure on
> >> sun4i-a10-cubieboard that's been happening for quite a while.  Based
> >> on on kernelci.org, it showed up sometime during the v4.15 merge
> >> window[1].  It bisected down to this commit (in mainline as commit
> >> 41193869f2bdb585ce09bfdd16d9482aadd560ad).
> >>
> >> When it fails, there is no output on the serial console, so I don't
> >> know exactly how it's failing, just that it no longer boots.
> >
> > We tried out latest 4.15 with various compilers and it works:
> > - gcc version 7.1.1 20170622 (Red Hat Cross 7.1.1-3) (GCC) - A10 Gemei G9 tablet
> > - gcc 7.2.0-debian - A10 Cubieboard
> 
> And you can reproduce the bug with gcc5 or gcc6?

Tried following commits on Gemei G9 (A10 tablet):
* 4.15.0-rc3-00037-gd39a01eff9af - latest master
* 4.14.0-rc1-00002-g41193869f2bd - the exact commit, causing the issue.

With the same Linaro toolchain:
(gcc version 5.3.1 20160412 (Linaro GCC 5.3-2016.05))

> 
> Very strange that a DT only patch would cause a gcc related regression
> and if it does, it should be investigated.  I don't think requiring
> gcc7 is an appropriate solution.
> 
> @Chen-Yu, @Maxime: are you guys OK with requiring gcc7 for working
> upstream boot for A10?
> 
> Kevin
> 
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