linux-kernel - Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override

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Date:   Wed, 3 May 2017 22:41:01 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     Leonard Crestez <leonard.crestez@....com>,
        Fabio Estevam <festevam@...il.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Peter Chen <Peter.Chen@....com>,
        Anson Huang <Anson.Huang@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Christoph Fritz <chf.fritz@...glemail.com>
Subject: Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override

On Wed, May 03, 2017 at 04:32:06PM +0200, Marek Vasut wrote:
> On 05/03/2017 04:26 PM, Marek Vasut wrote:
> > On 05/03/2017 03:57 PM, Shawn Guo wrote:
> >> On Tue, Apr 25, 2017 at 07:28:06PM +0200, Marek Vasut wrote:
> >>> On 04/25/2017 07:23 PM, Leonard Crestez wrote:
> >>>> Anyway, that version also sets the supply for reg_arm and reg_soc. It
> >>>> is not necessary for fixing the crash I'm seeing but is good because it
> >>>> will result in the minimum voltage on VDD_ARM_SOC_IN rather than a fix
> >>>> 1375mv. I tested Marek's patch and it works fine on my rev B board
> >>>> (which otherwise fails to boot upstream).
> >>>
> >>> Oh that's nice , thanks ! I don't have SDB and I hacked it up after a
> >>> brief discussion with Fabio without even compile-testing it, thus RFC.
> >>> Glad to hear it works and thanks for testing it ! Can you add a formal
> >>> Tested-by please ?
> >>
> >> Hi Marek,
> > 
> > Hi Shawn,
> > 
> >> Thanks for your patch.  But I prefer Leonard's version because: 1) it
> >> has a better commit log; 2) it sticks to one-patch-does-one-thing
> >> policy.
> > 
> > Well I'd prefer this patch because
> > 1) It has T-B
> 
> Correction, two TBs [1]
> 
> [1] https://patchwork.kernel.org/patch/9698749/

That doesn't mean Leonard's patch hasn't been tested by anyone.

> > 2) It actually fixes a problem with the voltage rails such that the DVFS
> >    works without leaving the system in unstable or dead state. You do
> >    need the second part of my patch if you drop the OPP hackery, without
> >    it the power framework cannot correctly configure the core voltages,
> >    so the patch from Leonard makes things worse.

If that's true, I will change my mind.

Shawn