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

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Date:   Wed, 3 May 2017 16:32:06 +0200
From:   Marek Vasut <marex@...x.de>
To:     Shawn Guo <shawnguo@...nel.org>
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 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/

> 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.
> 
>> But I'm going to wait for a while to get Peter's comment discussed,
>> before I actually apply Leonard's patch.
>>
>> Shawn
>>
> 
> 


-- 
Best regards,
Marek Vasut