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

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Date:   Wed, 28 Aug 2019 17:03:43 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Anson Huang <anson.huang@....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

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.

thanks,
rui
> Thanks,
> Anson 
> 
> > 
> > BTW, who is maintaining qoriq driver from NXP? If Anson is
> > maintaining and
> > developing this driver, it's better to update this in the driver or
> > the
> > MAINTAINER file, I will take the driver specific patches as long as
> > we have
> > ACK/Reviewed-By from the driver maintainer.
> > 
> > thanks,
> > rui
> > 
> > > 
> > > --
> > > Regards,
> > > Leonard
> 
>