linux-kernel - Re: [RFC RESEND PATCH 3/7] soc: mediatek: add support for the performance state

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Message-ID: <1546859194.6818.129.camel@mtksdaap41>
Date:   Mon, 7 Jan 2019 19:06:34 +0800
From:   Henry Chen <henryc.chen@...iatek.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Fan Chen <fan.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Kees Cook <keescook@...omium.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RFC RESEND PATCH 3/7] soc: mediatek: add support for the
 performance state

On Thu, 2019-01-03 at 14:57 -0800, Stephen Boyd wrote:
> Quoting Henry Chen (2019-01-02 06:09:54)
> > @@ -187,6 +190,18 @@ struct scp_soc_data {
> >         bool bus_prot_reg_update;
> >  };
> >  
> > +BLOCKING_NOTIFIER_HEAD(scpsys_notifier_list);
> 
> static?
OK
> 
> > +
> > +int register_scpsys_notifier(struct notifier_block *nb)
> > +{
> > +       return blocking_notifier_chain_register(&scpsys_notifier_list, nb);
> > +}
> > +
> > +int unregister_scpsys_notifier(struct notifier_block *nb)
> > +{
> > +       return blocking_notifier_chain_unregister(&scpsys_notifier_list, nb);
> > +}
> 
> What is the notifier for?
It used to notifier the DVFSRC driver that performance stat was changed.
> 
> > +
> >  static int scpsys_domain_is_on(struct scp_domain *scpd)
> >  {
> >         struct scp *scp = scpd->scp;
> > @@ -536,6 +551,48 @@ static void init_clks(struct platform_device *pdev, struct clk **clk)
> >                 clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
> >  }
> >  
> > +static int mtk_pd_set_performance(struct generic_pm_domain *genpd,
> > +                                 unsigned int state)
> > +{
> > +       int i;
> > +       struct scp_domain *scpd =
> > +               container_of(genpd, struct scp_domain, genpd);
> > +       struct scp_event_data scpe;
> > +       struct scp *scp = scpd->scp;
> > +       struct genpd_onecell_data *pd_data = &scp->pd_data;
> > +
> > +       for (i = 0; i < pd_data->num_domains; i++) {
> > +               if (genpd == pd_data->domains[i]) {
> > +                       dev_dbg(scp->dev, "%d. %s = %d\n",
> > +                               i, genpd->name, state);
> > +                       break;
> > +               }
> > +       }
> > +
> > +       scpe.event_type = MTK_SCPSYS_PSTATE;
> > +       scpe.genpd = genpd;
> > +       scpe.domain_id = i;
> > +       blocking_notifier_call_chain(&scpsys_notifier_list, state, &scpe);
> > +
> > +       return 0;
> > +}
> > +
> > +static unsigned int mtk_pd_get_performance(struct generic_pm_domain *genpd,
> > +                                          struct dev_pm_opp *opp)
> > +{
> > +       struct device_node *np;
> > +       unsigned int state;
> > +
> > +       np = dev_pm_opp_get_of_node(opp);
> > +
> > +       if (of_property_read_u32(np, "mtk,level", &state))
> > +               return 0;
> > +
> > +       of_node_put(np);
> 
> The generic API that Rajendra is adding I guess will become even more
> generic by assuming some sort of property like 'opp-level' or
> 'performance-state' that is just some raw number.
ok, I will follow the new property from Rajendra.

> > +
> > +       return state;
> > +}
> > +
> >  static struct scp *init_scp(struct platform_device *pdev,
> >                         const struct scp_domain_data *scp_domain_data, int num,
> >                         const struct scp_ctrl_reg *scp_ctrl_reg,