linux-kernel - RE: [PATCH V3 1/5] thermal: qoriq: Add clock operations

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Date:   Wed, 28 Aug 2019 09:10:41 +0000
From:   Anson Huang <anson.huang@....com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Leonard Crestez <leonard.crestez@....com>,
        Shawn Guo <shawnguo@...nel.org>
CC:     Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>
Subject: RE: [PATCH V3 1/5] thermal: qoriq: Add clock operations

Hi, Rui

> On Wed, 2019-08-28 at 08:51 +0000, Anson Huang wrote:
> > Hi, Rui
> >
> > > On Tue, 2019-08-27 at 12:41 +0000, Leonard Crestez wrote:
> > > > On 27.08.2019 04:51, Anson Huang wrote:
> > > > > > In an earlier series the CLK_IS_CRITICAL flags was removed
> > > > > > from the TMU clock so if the thermal driver doesn't explicitly
> > > > > > enable it the system will hang on probe. This is what happens
> > > > > > in linux-next right now!
> > > > >
> > > > > The thermal driver should be built with module, so default
> > > > > kernel should can boot up, do you modify the thermal driver as
> > > > > built- in?
> > > > >
> > > > > > Unless this patches is merged soon we'll end up with a 5.4-
> > > > > > rc1
> > > > > > that doesn't boot on imx8mq. An easy fix would be to
> > > > > > drop/revert commit
> > > > > > 951c1aef9691 ("clk: imx8mq: Remove CLK_IS_CRITICAL flag for
> > > > > > IMX8MQ_CLK_TMU_ROOT") until the thermal patches are accepted.
> > > > >
> > > > > If the thermal driver is built as module, I think no need to
> > > > > revert the commit, but if by default thermal driver is built-in
> > > > > or mod probed, then yes, it should NOT break kernel boot up.
> > > >
> > > > The qoriq_thermal driver is built as a module in defconfig and
> > > > when modules are properly installed in rootfs they will be
> > > > automatically be probed on boot and cause a hang.
> > > >
> > > > I usually run nfsroot with modules:
> > > >
> > > >      make modules_install INSTALL_MOD_PATH=/srv/nfs/imx8-root
> > >
> > > so we need this patch shipped in the beginning of the merge window,
> > > right?
> > > if there is hard dependency between patches, it's better to send
> > > them in one series, and get shipped via either tree.
> >
> > There is no hard dependency in this patch series. Previous for the TMU
> > clock disabled patch, since thermal driver is built as module so I did
> > NOT found the issue. The patch series is the correct fix.
> >
> Got it.
> the clock patch is also queued for 5.4-rc1, right?
> I will apply this series and try to push it as early as possible during the merge
> window.

The clock patch is as below in Linux-next tree, while I did NOT see it in v5.3-rc6,
so it should be queued for 5.4-rc1, right?
Thanks for taking the patch series!


commit 951c1aef9691491ddf4dd5aab76f2665d56bd5d3
Author: Anson Huang <Anson.Huang@....com>
Date:   Fri Jul 5 12:56:11 2019 +0800

    clk: imx8mq: Remove CLK_IS_CRITICAL flag for IMX8MQ_CLK_TMU_ROOT

    IMX8MQ_CLK_TMU_ROOT is ONLY used for thermal module, the driver
    should manage this clock, so no need to have CLK_IS_CRITICAL flag
    set.

    Signed-off-by: Anson Huang <Anson.Huang@....com>
    Reviewed-by: Abel Vesa <abel.vesa@....com>
    Acked-by: Stephen Boyd <sboyd@...nel.org>
    Signed-off-by: Shawn Guo <shawnguo@...nel.org>

drivers/clk/imx/clk-imx8mq.c


Thanks,
Anson