linux-kernel - Re: [PATCH v6 4/6] soc: qcom: Extend RPMh power controller driver to register warming devices.

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Message-ID: <CAPDyKFpYkF8d8Pv3zg7rw4pC6gC_H7auywziEYDi4mfue1OEJQ@mail.gmail.com>
Date:   Tue, 16 Jun 2020 11:21:34 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, Rob Herring <robh@...nel.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 4/6] soc: qcom: Extend RPMh power controller driver to
 register warming devices.

On Thu, 4 Jun 2020 at 03:53, Thara Gopinath <thara.gopinath@...aro.org> wrote:
>
> RPMh power control hosts power domains that can be used as
> thermal warming devices. Register these power domains
> with the generic power domain warming device thermal framework.
>
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe


> ---
>
> v3->v4:
>         - Introduce a boolean value is_warming_dev in rpmhpd structure to
>           indicate if a generic power domain can be used as a warming
>           device or not.With this change, device tree no longer has to
>           specify which power domain inside the rpmh power domain provider
>           is a warming device.
>         - Move registering of warming devices into a late initcall to
>           ensure that warming devices are registered after thermal
>           framework is initialized.
>
> v5->v6:
>         - Moved back registering of warming devices into probe since
>           Bjorn pointed out that now the driver can be initialized as
>           as a module, late_initcall will not work. Thermal framework
>           takes care of binding a cooling device to a thermal zone even
>           if the cooling device is registered before the thermal framework
>           is initialized.
>
>  drivers/soc/qcom/rpmhpd.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
> index a9c597143525..29e1eb4d11af 100644
> --- a/drivers/soc/qcom/rpmhpd.c
> +++ b/drivers/soc/qcom/rpmhpd.c
> @@ -12,6 +12,7 @@
>  #include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_opp.h>
> +#include <linux/pd_warming.h>
>  #include <soc/qcom/cmd-db.h>
>  #include <soc/qcom/rpmh.h>
>  #include <dt-bindings/power/qcom-rpmpd.h>
> @@ -49,6 +50,7 @@ struct rpmhpd {
>         bool            enabled;
>         const char      *res_name;
>         u32             addr;
> +       bool            is_warming_dev;
>  };
>
>  struct rpmhpd_desc {
> @@ -90,6 +92,7 @@ static struct rpmhpd sdm845_mx = {
>         .pd = { .name = "mx", },
>         .peer = &sdm845_mx_ao,
>         .res_name = "mx.lvl",
> +       .is_warming_dev = true,
>  };
>
>  static struct rpmhpd sdm845_mx_ao = {
> @@ -472,7 +475,19 @@ static int rpmhpd_probe(struct platform_device *pdev)
>                                                &rpmhpds[i]->pd);
>         }
>
> -       return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
> +       ret = of_genpd_add_provider_onecell(pdev->dev.of_node, data);
> +
> +       if (ret)
> +               return ret;
> +
> +       if (!of_find_property(dev->of_node, "#cooling-cells", NULL))
> +               return 0;
> +
> +       for (i = 0; i < num_pds; i++)
> +               if (rpmhpds[i]->is_warming_dev)
> +                       of_pd_warming_register(rpmhpds[i]->dev, i);
> +
> +       return 0;
>  }
>
>  static struct platform_driver rpmhpd_driver = {
> --
> 2.20.1
>