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Date: Fri, 4 Jan 2019 15:21:09 +0800
From: Nicolas Boichat <drinkcat@...omium.org>
To: Henry Chen <henryc.chen@...iatek.com>
Cc: Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Ulf Hansson <ulf.hansson@...aro.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 Mailing List <linux-arm-kernel@...ts.infradead.org>,
linux-mediatek@...ts.infradead.org,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/7] soc: mediatek: add support for the performance state
On Thu, Jan 3, 2019 at 10:16 PM Henry Chen <henryc.chen@...iatek.com> wrote:
>
> 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@...iatek.com> wrote:
> > >
> > > Support power domain performance state, add header file for scp event.
> > >
> > > Signed-off-by: Henry Chen <henryc.chen@...iatek.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 :)
Really not a big deal, but I did check and I think it fits ,-)
struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
01234567890123456789012345678901234567890123456789012345678901234567890123456789
> >
> > > + 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
> > >
>
>
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