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

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Date:   Wed, 13 Dec 2017 17:13:58 +0000
From:   Priit Laes <plaes@...es.org>
To:     Kevin Hilman <khilman@...libre.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.xyz>,
        Russell King <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Olof Johansson <olof@...om.net>
Subject: Re: [linux-sunxi] [PATCH v2 3/6] ARM: sun4i: Convert to CCU

On Wed, Dec 13, 2017 at 05:09:33PM +0000, Priit Laes wrote:
> 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@...es.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@...es.org> wrote:
> > >> > Convert sun4i-a10.dtsi to new CCU driver.
> > >> >
> > >> > Signed-off-by: Priit Laes <plaes@...es.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))

And I also tried the same dtb and zImage from kernelci page [1] and it works with
that too...

https://storage.kernelci.org/mainline/master/v4.15-rc3/arm/sunxi_defconfig/
> 
> > 
> > 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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