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

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Date:   Wed, 13 Dec 2017 14:44:46 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Kevin Hilman <khilman@...libre.com>
Cc:     Priit Laes <plaes@...es.org>, Chen-Yu Tsai <wens@...e.org>,
        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 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?
> 
> 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?

I'd rather not set that kind of constraints and fix the issue instead.

Priit, can you test with an older compiler?
You can find one here:
http://toolchains.free-electrons.com/

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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