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

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Date:   Tue, 12 Dec 2017 13:24:52 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Priit Laes <plaes@...es.org>, Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     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 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?

Kevin