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

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Message-ID: <CAGb2v669UVc8SC=-KUimhN5x7tLP_7yyDYXWCEuZ4qySrRj3Cg@mail.gmail.com>
Date:   Mon, 8 Jan 2018 17:15:09 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Kevin Hilman <khilman@...libre.com>
Cc:     Priit Laes <plaes@...es.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 <linux-clk@...r.kernel.org>,
        linux-sunxi <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 Sat, Jan 6, 2018 at 12:10 AM, Kevin Hilman <khilman@...libre.com> wrote:
> On Wed, Dec 13, 2017 at 11:46 AM, Kevin Hilman <khilman@...libre.com> wrote:
>> On Wed, Dec 13, 2017 at 9:13 AM, Priit Laes <plaes@...es.org> wrote:
>>> 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/
>>
>> Can you share a full boot-log (including all the u-boot output etc.)
>> so I can see exactly how the kernel is being loaded?    Especially the
>> u-boot version?
>>
>> As $SUBJECT patch seems to be changing clocks around, perhaps this is
>> an issue where some u-boot dependency is uncovered, and older versions
>> of u-boot don't play well with this change.
>
> Ping.
>
> This is still failing in mainline, but passing int stable <= v4.14

Just did a test with clean builds of v4.15-rc7 with sunxi_defconfig
and U-boot 2018.01-rc3 with Cubieboard_defconfig. It successfully
boots to a prompt. My previous bootloader was U-boot 2017.05 with
some local modifications.

Here is the full boot log: https://wens.tw/cb-boot-log.txt

The boot script is:

setenv bootargs console=tty0 console=ttyS0,115200n8
root=/dev/mmcblk0p1 rootwait panic=10 earlycon=uart,mmio32,0x01c28000
consoleblank=0 drm.debug=0x1e
load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} boot/zImage
load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} boot/${fdtfile}
bootz ${kernel_addr_r} - ${fdt_addr_r}

Regards
ChenYu