Message-ID: <4315091f-03b1-2df6-b224-6a29d3261371@nvidia.com>
Date:   Mon, 21 Aug 2017 10:40:44 +0800
From:   Wei Ni <wni@...dia.com>
To:     Zhang Rui <rui.zhang@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>, <edubezval@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] thermal: Add Tegra BPMP thermal sensor driver



On Friday, August 11, 2017 10:57 AM, Zhang Rui wrote:
> On Mon, 2017-07-24 at 19:29 +0300, Mikko Perttunen wrote:
>> On Tegra186, the BPMP (Boot and Power Management Processor) exposes
>> an
>> interface to thermal sensors on the system-on-chip. This driver
>> implements access to the interface. It supports reading the
>> temperature, setting trip points and receiving notification of a
>> tripped trip point.
>>
>> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> 
> Wei Ni,
> 
> what do you think of this patch?

Reviewed this patch, it looked fine to me.

> 
> thanks,
> rui
>> ---
>> v2:
>> - don't allocate space for disabled zones
>> - allow compilation with COMPILE_TEST
>>
>>  drivers/thermal/Makefile             |   2 +-
>>  drivers/thermal/tegra/Kconfig        |   7 +
>>  drivers/thermal/tegra/Makefile       |   3 +-
>>  drivers/thermal/tegra/bpmp-thermal.c | 263
>> +++++++++++++++++++++++++++++++++++
>>  4 files changed, 273 insertions(+), 2 deletions(-)
>>  create mode 100644 drivers/thermal/tegra/bpmp-thermal.c
>>
>> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
>> index 094d7039981c..c03dccdba7b8 100644
>> --- a/drivers/thermal/Makefile
>> +++ b/drivers/thermal/Makefile
>> @@ -54,7 +54,7 @@ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) +=
>> intel_bxt_pmic_thermal.o
>>  obj-$(CONFIG_INTEL_PCH_THERMAL)	+= intel_pch_thermal.o
>>  obj-$(CONFIG_ST_THERMAL)	+= st/
>>  obj-$(CONFIG_QCOM_TSENS)	+= qcom/
>> -obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra/
>> +obj-y				+= tegra/
>>  obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
>>  obj-$(CONFIG_MTK_THERMAL)	+= mtk_thermal.o
>>  obj-$(CONFIG_GENERIC_ADC_THERMAL)	+= thermal-generic-adc.o
>> diff --git a/drivers/thermal/tegra/Kconfig
>> b/drivers/thermal/tegra/Kconfig
>> index cec586ec7e4b..f8740f7852e3 100644
>> --- a/drivers/thermal/tegra/Kconfig
>> +++ b/drivers/thermal/tegra/Kconfig
>> @@ -10,4 +10,11 @@ config TEGRA_SOCTHERM
>>  	  zones to manage temperatures. This option is also required
>> for the
>>  	  emergency thermal reset (thermtrip) feature to function.
>>  
>> +config TEGRA_BPMP_THERMAL
>> +	tristate "Tegra BPMP thermal sensing"
>> +	depends on TEGRA_BPMP || COMPILE_TEST
>> +	help
>> +	 Enable this option for support for sensing system
>> temperature of NVIDIA
>> +	 Tegra systems-on-chip with the BPMP coprocessor (Tegra186).
>> +
>>  endmenu
>> diff --git a/drivers/thermal/tegra/Makefile
>> b/drivers/thermal/tegra/Makefile
>> index 1ce1af2cf0f5..757abcd1feaf 100644
>> --- a/drivers/thermal/tegra/Makefile
>> +++ b/drivers/thermal/tegra/Makefile
>> @@ -1,4 +1,5 @@
>> -obj-$(CONFIG_TEGRA_SOCTHERM)	+= tegra-soctherm.o
>> +obj-$(CONFIG_TEGRA_SOCTHERM)		+= tegra-soctherm.o
>> +obj-$(CONFIG_TEGRA_BPMP_THERMAL)	+= bpmp-thermal.o
>>  
>>  tegra-soctherm-y				:= soctherm.o
>> soctherm-fuse.o
>>  tegra-soctherm-$(CONFIG_ARCH_TEGRA_124_SOC)	+= tegra124-
>> soctherm.o
>> diff --git a/drivers/thermal/tegra/bpmp-thermal.c
>> b/drivers/thermal/tegra/bpmp-thermal.c
>> new file mode 100644
>> index 000000000000..b0980dbca3b3
>> --- /dev/null
>> +++ b/drivers/thermal/tegra/bpmp-thermal.c
>> @@ -0,0 +1,263 @@
>> +/*
>> + * Copyright (c) 2015-2017, NVIDIA CORPORATION.  All rights
>> reserved.
>> + *
>> + * Author:
>> + *	Mikko Perttunen <mperttunen@...dia.com>
>> + *	Aapo Vienamo	<avienamo@...dia.com>
>> + *
>> + * This software is licensed under the terms of the GNU General
>> Public
>> + * License version 2, as published by the Free Software Foundation,
>> and
>> + * may be copied, distributed, and modified under those terms.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/thermal.h>
>> +#include <linux/workqueue.h>
>> +
>> +#include <soc/tegra/bpmp.h>
>> +#include <soc/tegra/bpmp-abi.h>
>> +
>> +struct tegra_bpmp_thermal_zone {
>> +	struct tegra_bpmp_thermal *tegra;
>> +	struct thermal_zone_device *tzd;
>> +	struct work_struct tz_device_update_work;
>> +	unsigned int idx;
>> +};
>> +
>> +struct tegra_bpmp_thermal {
>> +	struct device *dev;
>> +	struct tegra_bpmp *bpmp;
>> +	unsigned int num_zones;
>> +	struct tegra_bpmp_thermal_zone **zones;
>> +};
>> +
>> +static int tegra_bpmp_thermal_get_temp(void *data, int *out_temp)
>> +{
>> +	struct tegra_bpmp_thermal_zone *zone = data;
>> +	struct mrq_thermal_host_to_bpmp_request req;
>> +	union mrq_thermal_bpmp_to_host_response reply;
>> +	struct tegra_bpmp_message msg;
>> +	int err;
>> +
>> +	memset(&req, 0, sizeof(req));
>> +	req.type = CMD_THERMAL_GET_TEMP;
>> +	req.get_temp.zone = zone->idx;
>> +
>> +	memset(&msg, 0, sizeof(msg));
>> +	msg.mrq = MRQ_THERMAL;
>> +	msg.tx.data = &req;
>> +	msg.tx.size = sizeof(req);
>> +	msg.rx.data = &reply;
>> +	msg.rx.size = sizeof(reply);
>> +
>> +	err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
>> +	if (err)
>> +		return err;
>> +
>> +	*out_temp = reply.get_temp.temp;
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_bpmp_thermal_set_trips(void *data, int low, int
>> high)
>> +{
>> +	struct tegra_bpmp_thermal_zone *zone = data;
>> +	struct mrq_thermal_host_to_bpmp_request req;
>> +	struct tegra_bpmp_message msg;
>> +
>> +	memset(&req, 0, sizeof(req));
>> +	req.type = CMD_THERMAL_SET_TRIP;
>> +	req.set_trip.zone = zone->idx;
>> +	req.set_trip.enabled = true;
>> +	req.set_trip.low = low;
>> +	req.set_trip.high = high;
>> +
>> +	memset(&msg, 0, sizeof(msg));
>> +	msg.mrq = MRQ_THERMAL;
>> +	msg.tx.data = &req;
>> +	msg.tx.size = sizeof(req);
>> +
>> +	return tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
>> +}
>> +
>> +static void tz_device_update_work_fn(struct work_struct *work)
>> +{
>> +	struct tegra_bpmp_thermal_zone *zone;
>> +
>> +	zone = container_of(work, struct tegra_bpmp_thermal_zone,
>> +			    tz_device_update_work);
>> +
>> +	thermal_zone_device_update(zone->tzd,
>> THERMAL_TRIP_VIOLATED);
>> +}
>> +
>> +static void bpmp_mrq_thermal(unsigned int mrq, struct
>> tegra_bpmp_channel *ch,
>> +			     void *data)
>> +{
>> +	struct mrq_thermal_bpmp_to_host_request *req;
>> +	struct tegra_bpmp_thermal *tegra = data;
>> +	int i;
>> +
>> +	req = (struct mrq_thermal_bpmp_to_host_request *)ch->ib-
>>> data;
>> +
>> +	if (req->type != CMD_THERMAL_HOST_TRIP_REACHED) {
>> +		dev_err(tegra->dev, "%s: invalid request type:
>> %d\n",
>> +			__func__, req->type);
>> +		tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
>> +		return;
>> +	}
>> +
>> +	for (i = 0; i < tegra->num_zones; ++i) {
>> +		if (tegra->zones[i]->idx != req-
>>> host_trip_reached.zone)
>> +			continue;
>> +
>> +		schedule_work(&tegra->zones[i]-
>>> tz_device_update_work);
>> +		tegra_bpmp_mrq_return(ch, 0, NULL, 0);
>> +		return;
>> +	}
>> +
>> +	dev_err(tegra->dev, "%s: invalid thermal zone: %d\n",
>> __func__,
>> +		req->host_trip_reached.zone);
>> +	tegra_bpmp_mrq_return(ch, -EINVAL, NULL, 0);
>> +}
>> +
>> +static int tegra_bpmp_thermal_get_num_zones(struct tegra_bpmp *bpmp,
>> +					    int *num_zones)
>> +{
>> +	struct mrq_thermal_host_to_bpmp_request req;
>> +	union mrq_thermal_bpmp_to_host_response reply;
>> +	struct tegra_bpmp_message msg;
>> +	int err;
>> +
>> +	memset(&req, 0, sizeof(req));
>> +	req.type = CMD_THERMAL_GET_NUM_ZONES;
>> +
>> +	memset(&msg, 0, sizeof(msg));
>> +	msg.mrq = MRQ_THERMAL;
>> +	msg.tx.data = &req;
>> +	msg.tx.size = sizeof(req);
>> +	msg.rx.data = &reply;
>> +	msg.rx.size = sizeof(reply);
>> +
>> +	err = tegra_bpmp_transfer(bpmp, &msg);
>> +	if (err)
>> +		return err;
>> +
>> +	*num_zones = reply.get_num_zones.num;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct thermal_zone_of_device_ops
>> tegra_bpmp_of_thermal_ops = {
>> +	.get_temp = tegra_bpmp_thermal_get_temp,
>> +	.set_trips = tegra_bpmp_thermal_set_trips,
>> +};
>> +
>> +static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
>> +{
>> +	struct tegra_bpmp *bpmp = dev_get_drvdata(pdev->dev.parent);
>> +	struct tegra_bpmp_thermal *tegra;
>> +	struct thermal_zone_device *tzd;
>> +	unsigned int i, max_num_zones;
>> +	int err;
>> +
>> +	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra),
>> GFP_KERNEL);
>> +	if (!tegra)
>> +		return -ENOMEM;
>> +
>> +	tegra->dev = &pdev->dev;
>> +	tegra->bpmp = bpmp;
>> +
>> +	err = tegra_bpmp_thermal_get_num_zones(bpmp,
>> &max_num_zones);
>> +	if (err) {
>> +		dev_err(&pdev->dev, "failed to get the number of
>> zones: %d\n",
>> +			err);
>> +		return err;
>> +	}
>> +
>> +	tegra->zones = devm_kcalloc(&pdev->dev, max_num_zones,
>> +				    sizeof(*tegra->zones),
>> GFP_KERNEL);
>> +	if (!tegra->zones)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < max_num_zones; ++i) {
>> +		struct tegra_bpmp_thermal_zone *zone;
>> +		int temp;
>> +
>> +		zone = devm_kzalloc(&pdev->dev, sizeof(*zone),
>> GFP_KERNEL);
>> +		if (!zone)
>> +			return -ENOMEM;
>> +
>> +		zone->idx = i;
>> +		zone->tegra = tegra;
>> +
>> +		err = tegra_bpmp_thermal_get_temp(zone, &temp);
>> +		if (err < 0) {
>> +			devm_kfree(&pdev->dev, zone);
>> +			continue;
>> +		}
>> +
>> +		tzd = devm_thermal_zone_of_sensor_register(
>> +			&pdev->dev, i, zone,
>> &tegra_bpmp_of_thermal_ops);
>> +		if (IS_ERR(tzd)) {
>> +			if (PTR_ERR(tzd) == -EPROBE_DEFER)
>> +				return -EPROBE_DEFER;
>> +			devm_kfree(&pdev->dev, zone);
>> +			continue;
>> +		}
>> +
>> +		zone->tzd = tzd;
>> +		INIT_WORK(&zone->tz_device_update_work,
>> +			  tz_device_update_work_fn);
>> +
>> +		tegra->zones[tegra->num_zones++] = zone;
>> +	}
>> +
>> +	err = tegra_bpmp_request_mrq(bpmp, MRQ_THERMAL,
>> bpmp_mrq_thermal,
>> +				     tegra);
>> +	if (err) {
>> +		dev_err(&pdev->dev, "failed to register mrq handler:
>> %d\n",
>> +			err);
>> +		return err;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, tegra);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_bpmp_thermal_remove(struct platform_device *pdev)
>> +{
>> +	struct tegra_bpmp_thermal *tegra =
>> platform_get_drvdata(pdev);
>> +
>> +	tegra_bpmp_free_mrq(tegra->bpmp, MRQ_THERMAL, tegra);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id tegra_bpmp_thermal_of_match[] = {
>> +	{ .compatible = "nvidia,tegra186-bpmp-thermal" },
>> +	{ },
>> +};
>> +MODULE_DEVICE_TABLE(of, tegra_bpmp_thermal_of_match);
>> +
>> +static struct platform_driver tegra_bpmp_thermal_driver = {
>> +	.probe = tegra_bpmp_thermal_probe,
>> +	.remove = tegra_bpmp_thermal_remove,
>> +	.driver = {
>> +		.name = "tegra-bpmp-thermal",
>> +		.of_match_table = tegra_bpmp_thermal_of_match,
>> +	},
>> +};
>> +module_platform_driver(tegra_bpmp_thermal_driver);
>> +
>> +MODULE_AUTHOR("Mikko Perttunen <mperttunen@...dia.com>");
>> +MODULE_DESCRIPTION("NVIDIA Tegra BPMP thermal sensor driver");
>> +MODULE_LICENSE("GPL v2");
> 
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