linux-kernel - RE: [PATCH 2/2] arm64: dts: imx8mm: Assign highest opp as suspend opp

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Date:   Tue, 9 Jul 2019 05:40:49 +0000
From:   Anson Huang <anson.huang@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
CC:     Leonard Crestez <leonard.crestez@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Jacky Bai <ping.bai@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "ccaione@...libre.com" <ccaione@...libre.com>,
        "angus@...ea.ca" <angus@...ea.ca>,
        "agx@...xcpu.org" <agx@...xcpu.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 2/2] arm64: dts: imx8mm: Assign highest opp as suspend opp

Hi, Viresh

> On 08-07-19, 08:54, Anson Huang wrote:
> > Each OPP has "opp-supported-hw" property as below, the first value
> > needs to be checked with speed grading fuse, and the second one needs
> > to be checked with market segment fuse, ONLY both of them passed, then
> > this OPP is supported. It calls dev_pm_opp_set_supported_hw() to tell
> > OPP framework to parse the OPP table, this is my understanding.
> >
> > opp-supported-hw = <0x8>, <0x3>;
> 
> Right, so that's what I was expecting.
> 
> One thing we can do is change the binding of OPP core a bit to allow multiple
> OPP nodes to contain the "opp-suspend" property and select the one finally
> with the highest frequency. That would be a better as a generic solution IMO.
> 
> And then a small OPP core patch will fix it.

Looks good, I will try to generate a patch for of OPP core.

Thanks,
Anson