linux-kernel - Re: [PATCH 1/2] OPP: Use _set_opp

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Date:   Wed, 25 Oct 2023 20:54:31 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Stephan Gerhold <stephan.gerhold@...nkonzept.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] OPP: Use _set_opp_level() for single genpd case

On 25-10-23, 15:47, Stephan Gerhold wrote:
> FWIW I'm hitting this WARNing when trying to set up the parent domain
> setup for CPR->RPMPD(MX) on MSM8916 that I discussed with Uffe recently
> [1]. I know, me and all my weird OPP setups. :'D
> 
> Basically, I have cpufreq voting for performance states of the CPR genpd
> (via required-opps). CPR is supposed to have <&rpmpd MSM8916_VDDMX_AO>
> as parent genpd and translates to the parent performance state using the
> "required-opps" in the *CPR* OPP table:
> 
> 	cpr: power-controller@...8000 {
> 		compatible = "qcom,msm8916-cpr", "qcom,cpr";
> 		reg = <0x0b018000 0x1000>;
> 		/* ... */
> 		#power-domain-cells = <0>;
> 		operating-points-v2 = <&cpr_opp_table>;
> 		/* Supposed to be parent domain, not consumer */
> 		power-domains = <&rpmpd MSM8916_VDDMX_AO>;
> 
> 		cpr_opp_table: opp-table {
> 			compatible = "operating-points-v2-qcom-level";
> 
> 			cpr_opp1: opp1 {
> 				opp-level = <1>;
> 				qcom,opp-fuse-level = <1>;
> 				required-opps = <&rpmpd_opp_svs_soc>;
> 			};
> 			cpr_opp2: opp2 {
> 				opp-level = <2>;
> 				qcom,opp-fuse-level = <2>;
> 				required-opps = <&rpmpd_opp_nom>;
> 			};
> 			cpr_opp3: opp3 {
> 				opp-level = <3>;
> 				qcom,opp-fuse-level = <3>;
> 				required-opps = <&rpmpd_opp_super_turbo>;
> 			};
> 		};
> 	};

I have forgotten a bit about this usecase. How exactly does the
configurations work currently for this ? I mean genpd core must be
setting the vote finally for only one of them or something else ?

-- 
viresh