linux-kernel - Re: [PATCH 2/3] thermal/drivers/intel: Use generic trip points for processor_thermal_device

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Message-ID: <e7ab0321e8c655836960295987f69c18d940ae52.camel@linux.intel.com>
Date:   Wed, 18 Jan 2023 11:09:51 -0800
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rui.zhang@...el.com, Amit Kucheria <amitk@...nel.org>,
        Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>,
        Shang XiaoJing <shangxiaojing@...wei.com>
Subject: Re: [PATCH 2/3] thermal/drivers/intel: Use generic trip points for
 processor_thermal_device_pci

On Wed, 2023-01-18 at 19:16 +0100, Daniel Lezcano wrote:
> The thermal framework gives the possibility to register the trip
> points with the thermal zone. When that is done, no get_trip_* ops
> are
> needed and they can be removed.
> 
> Convert ops content logic into generic trip points and register them
> with the
> thermal zone.
> 
In this scheme is the assumption is that trip point temperature never
changes? If firmware updated the trip temperature, what needs to be
done?

Thanks,
Srinivas


> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  .../processor_thermal_device_pci.c            | 53 ++++++++---------
> --
>  1 file changed, 22 insertions(+), 31 deletions(-)
> 
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.
> c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.
> c
> index bf1b1cdfade4..c7d50862bf56 100644
> ---
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.
> c
> +++
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.
> c
> @@ -144,34 +144,6 @@ static int sys_get_curr_temp(struct
> thermal_zone_device *tzd, int *temp)
>         return 0;
>  }
>  
> -static int sys_get_trip_temp(struct thermal_zone_device *tzd,
> -                            int trip, int *temp)
> -{
> -       struct proc_thermal_pci *pci_info = tzd->devdata;
> -       u32 _temp;
> -
> -       proc_thermal_mmio_read(pci_info, PROC_THERMAL_MMIO_THRES_0,
> &_temp);
> -       if (!_temp) {
> -               *temp = THERMAL_TEMP_INVALID;
> -       } else {
> -               int tjmax;
> -
> -               proc_thermal_mmio_read(pci_info,
> PROC_THERMAL_MMIO_TJMAX, &tjmax);
> -               _temp = tjmax - _temp;
> -               *temp = (unsigned long)_temp * 1000;
> -       }
> -
> -       return 0;
> -}
> -
> -static int sys_get_trip_type(struct thermal_zone_device *tzd, int
> trip,
> -                             enum thermal_trip_type *type)
> -{
> -       *type = THERMAL_TRIP_PASSIVE;
> -
> -       return 0;
> -}
> -
>  static int sys_set_trip_temp(struct thermal_zone_device *tzd, int
> trip, int temp)
>  {
>         struct proc_thermal_pci *pci_info = tzd->devdata;
> @@ -200,10 +172,26 @@ static int sys_set_trip_temp(struct
> thermal_zone_device *tzd, int trip, int temp
>         return 0;
>  }
>  
> +static int get_trip_temp(struct proc_thermal_pci *pci_info)
> +{
> +       int temp, tjmax;
> +
> +       proc_thermal_mmio_read(pci_info, PROC_THERMAL_MMIO_THRES_0,
> &temp);
> +       if (!temp)
> +               return THERMAL_TEMP_INVALID;
> +
> +       proc_thermal_mmio_read(pci_info, PROC_THERMAL_MMIO_TJMAX,
> &tjmax);
> +       temp = (tjmax - temp) * 1000;
> +
> +       return temp;
> +}
> +
> +static struct thermal_trip psv_trip = {
> +       .type = THERMAL_TRIP_PASSIVE,
> +};
> +
>  static struct thermal_zone_device_ops tzone_ops = {
>         .get_temp = sys_get_curr_temp,
> -       .get_trip_temp = sys_get_trip_temp,
> -       .get_trip_type = sys_get_trip_type,
>         .set_trip_temp  = sys_set_trip_temp,
>  };
>  
> @@ -251,7 +239,10 @@ static int proc_thermal_pci_probe(struct pci_dev
> *pdev, const struct pci_device_
>         if (ret)
>                 goto err_ret_thermal;
>  
> -       pci_info->tzone = thermal_zone_device_register("TCPU_PCI", 1,
> 1, pci_info,
> +       psv_trip.temperature = get_trip_temp(pci_info);
> +       
> +       pci_info->tzone =
> thermal_zone_device_register_with_trips("TCPU_PCI", &psv_trip,
> +                                                       1, 1,
> pci_info,
>                                                         &tzone_ops,
>                                                         &tzone_params
> , 0, 0);
>         if (IS_ERR(pci_info->tzone)) {