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

[Henry Chen <henryc.chen@mediatek.com>]

On Thu, 2019-01-03 at 09:48 +0800, Nicolas Boichat wrote:
> On Wed, Jan 2, 2019 at 10:01 PM Henry Chen <henryc.chen@mediatek.com> wrote:
> >
> > Support power domain performance state, add header file for scp event.
> >
> > Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-scpsys.c | 60 +++++++++++++++++++++++++++++++++++++++
> >  drivers/soc/mediatek/mtk-scpsys.h | 22 ++++++++++++++
> >  2 files changed, 82 insertions(+)
> >  create mode 100644 drivers/soc/mediatek/mtk-scpsys.h
> >
> > diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> > index 58d84fe..90102ae 100644
> > --- a/drivers/soc/mediatek/mtk-scpsys.c
> > +++ b/drivers/soc/mediatek/mtk-scpsys.c
> > @@ -11,7 +11,9 @@
> >  #include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/pm_domain.h>
> > +#include <linux/pm_opp.h>
> >  #include <linux/regulator/consumer.h>
> > +#include <linux/slab.h>
> >  #include <linux/soc/mediatek/infracfg.h>
> >  #include <linux/soc/mediatek/scpsys-ext.h>
> >
> > @@ -22,6 +24,7 @@
> >  #include <dt-bindings/power/mt7623a-power.h>
> >  #include <dt-bindings/power/mt8173-power.h>
> >  #include <dt-bindings/power/mt8183-power.h>
> > +#include "mtk-scpsys.h"
> >
> >  #define MTK_POLL_DELAY_US   10
> >  #define MTK_POLL_TIMEOUT    (jiffies_to_usecs(HZ))
> > @@ -187,6 +190,18 @@ struct scp_soc_data {
> >         bool bus_prot_reg_update;
> >  };
> >
> > +BLOCKING_NOTIFIER_HEAD(scpsys_notifier_list);
> > +
> > +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);
> > +}
> > +
> >  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);
> 
> nit: This (just) fits in 80 chars.
Try again and get 81 chars :)
> 
> > +       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;
> > +               }
> > +       }
> 
> Do we need a sanity check here, if i == pd_data->num_domains?
Oops. It needed, thanks for remind.
> 
> > +
> > +       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);
> > +
> > +       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,
> > @@ -659,6 +716,9 @@ static struct scp *init_scp(struct platform_device *pdev,
> >                 genpd->power_on = scpsys_power_on;
> >                 if (MTK_SCPD_CAPS(scpd, MTK_SCPD_ACTIVE_WAKEUP))
> >                         genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
> > +
> > +               genpd->set_performance_state = mtk_pd_set_performance;
> > +               genpd->opp_to_performance_state = mtk_pd_get_performance;
> >         }
> >
> >         return scp;
> > diff --git a/drivers/soc/mediatek/mtk-scpsys.h b/drivers/soc/mediatek/mtk-scpsys.h
> > new file mode 100644
> > index 0000000..c1e8325
> > --- /dev/null
> > +++ b/drivers/soc/mediatek/mtk-scpsys.h
> > @@ -0,0 +1,22 @@
> > +/* SPDX-License-Identifier: GPL-2.0
> > + *
> > + * Copyright (c) 2018 MediaTek Inc.
> > + */
> > +
> > +#ifndef __MTK_SCPSYS_H__
> > +#define __MTK_SCPSYS_H__
> > +
> > +struct scp_event_data {
> > +       int event_type;
> > +       int domain_id;
> > +       struct generic_pm_domain *genpd;
> > +};
> > +
> > +enum scp_event_type {
> > +       MTK_SCPSYS_PSTATE,
> > +};
> > +
> > +int register_scpsys_notifier(struct notifier_block *nb);
> > +int unregister_scpsys_notifier(struct notifier_block *nb);
> > +
> > +#endif /* __MTK_SCPSYS_H__ */
> > --
> > 1.9.1
> >