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[71.255.246.27]) by smtp.googlemail.com with ESMTPSA id g45sm3400713qtc.9.2019.09.10.10.14.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 10 Sep 2019 10:14:42 -0700 (PDT) From: Thara Gopinath To: edubezval@gmail.com, rui.zhang@intel.com, ulf.hansson@linaro.org, daniel.lezcano@linaro.org, bjorn.andersson@linaro.org, robh+dt@kernel.org, agross@kernel.org Cc: amit.kucheria@verdurent.com, mark.rutland@arm.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/5] thermal: Add generic power domain warming device driver. Date: Tue, 10 Sep 2019 13:14:35 -0400 Message-Id: <1568135676-9328-5-git-send-email-thara.gopinath@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1568135676-9328-1-git-send-email-thara.gopinath@linaro.org> References: <1568135676-9328-1-git-send-email-thara.gopinath@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Resources modeled as power domains in linux kenrel can be used to warm the SoC(eg. mx power domain on sdm845). To support this feature, introduce a generic power domain warming device driver that can be plugged into the thermal framework (The thermal framework itself requires further modifiction to support a warming device in place of a cooling device. Those extensions are not introduced in this patch series). Signed-off-by: Thara Gopinath --- v1->v2: - Make power domain based warming device driver a generic driver in the thermal framework. v1 implemented this as a Qualcomm specific driver. - Rename certain variables as per review suggestions on the mailing list. drivers/thermal/Kconfig | 11 +++ drivers/thermal/Makefile | 2 + drivers/thermal/pwr_domain_warming.c | 174 +++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/thermal/pwr_domain_warming.c -- 2.1.4 diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 9966364..eeb6018 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -187,6 +187,17 @@ config DEVFREQ_THERMAL If you want this support, you should say Y here. +config PWR_DOMAIN_WARMING_THERMAL + bool "Power Domain based warming device" + depends on PM_GENERIC_DOMAINS + depends on PM_GENERIC_DOMAINS_OF + help + This implements the generic power domain based warming + mechanism through increasing the performance state of + a power domain. + + If you want this support, you should say Y here. + config THERMAL_EMULATION bool "Thermal emulation mode support" help diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 74a37c7..382c64a 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -27,6 +27,8 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o # devfreq cooling thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o +thermal_sys-$(CONFIG_PWR_DOMAIN_WARMING_THERMAL) += pwr_domain_warming.o + # platform thermal drivers obj-y += broadcom/ obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o diff --git a/drivers/thermal/pwr_domain_warming.c b/drivers/thermal/pwr_domain_warming.c new file mode 100644 index 0000000..3dd792b --- /dev/null +++ b/drivers/thermal/pwr_domain_warming.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019, Linaro Ltd + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct pd_warming_device { + struct thermal_cooling_device *cdev; + struct device *dev; + int max_state; + int cur_state; + bool runtime_resumed; +}; + +static const struct of_device_id pd_wdev_match_table[] = { + { .compatible = "thermal-power-domain-wdev", .data = NULL }, + { } +}; +MODULE_DEVICE_TABLE(of, pd_wdev_match_table); + +static int pd_wdev_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + + *state = pd_wdev->max_state; + return 0; +} + +static int pd_wdev_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + + *state = dev_pm_genpd_get_performance_state(pd_wdev->dev); + + return 0; +} + +static int pd_wdev_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct pd_warming_device *pd_wdev = cdev->devdata; + struct device *dev = pd_wdev->dev; + int ret; + + ret = dev_pm_genpd_set_performance_state(dev, state); + + if (ret) + return ret; + + if (state && !pd_wdev->runtime_resumed) { + ret = pm_runtime_get_sync(dev); + pd_wdev->runtime_resumed = true; + } else if (!state && pd_wdev->runtime_resumed) { + ret = pm_runtime_put(dev); + pd_wdev->runtime_resumed = false; + } + + return ret; +} + +static struct thermal_cooling_device_ops pd_warming_device_ops = { + .get_max_state = pd_wdev_get_max_state, + .get_cur_state = pd_wdev_get_cur_state, + .set_cur_state = pd_wdev_set_cur_state, +}; + +static int pd_wdev_create(struct device *dev, const char *name) +{ + struct pd_warming_device *pd_wdev; + int state_count; + + pd_wdev = devm_kzalloc(dev, sizeof(*pd_wdev), GFP_KERNEL); + if (!pd_wdev) + return -ENOMEM; + + state_count = dev_pm_genpd_performance_state_count(dev); + if (state_count < 0) + return state_count; + + pd_wdev->dev = dev; + pd_wdev->max_state = state_count - 1; + pd_wdev->runtime_resumed = false; + + pm_runtime_enable(dev); + + pd_wdev->cdev = thermal_of_cooling_device_register + (dev->of_node, name, + pd_wdev, + &pd_warming_device_ops); + if (IS_ERR(pd_wdev->cdev)) { + dev_err(dev, "unable to register %s cooling device\n", name); + pm_runtime_disable(dev); + + return PTR_ERR(pd_wdev->cdev); + } + + return 0; +} + +static int pd_wdev_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev, *pd_dev; + const char *pd_name; + int id, count, ret = 0; + + count = of_count_phandle_with_args(dev->of_node, "power-domains", + "#power-domain-cells"); + + if (count > 1) { + for (id = 0; id < count; id++) { + ret = of_property_read_string_index + (dev->of_node, "power-domain-names", + id, &pd_name); + if (ret) { + dev_err(dev, "Error reading the power domain name %d\n", ret); + continue; + } + + pd_dev = dev_pm_domain_attach_by_id(dev, id); + if (IS_ERR(pd_dev)) { + dev_err(dev, "Error attaching power domain %s %ld\n", pd_name, PTR_ERR(pd_dev)); + continue; + } + + ret = pd_wdev_create(pd_dev, pd_name); + if (ret) { + dev_err(dev, "Error building cooling device %s %d\n", pd_name, ret); + dev_pm_domain_detach(pd_dev, false); + continue; + } + } + } else if (count == 1) { + ret = of_property_read_string_index(dev->of_node, + "power-domain-names", + 0, &pd_name); + if (ret) { + dev_err(dev, "Error reading the power domain name %d\n", ret); + goto exit; + } + + ret = pd_wdev_create(dev, pd_name); + if (ret) { + dev_err(dev, "Error building cooling device %s %d\n", pd_name, ret); + goto exit; + } + } else { + ret = -EINVAL; + } + +exit: + return ret; +} + +static struct platform_driver pd_wdev_driver = { + .driver = { + .name = "qcom-rpmhpd-cdev", + .of_match_table = pd_wdev_match_table, + }, + .probe = pd_wdev_probe, +}; +module_platform_driver(pd_wdev_driver); + +MODULE_DESCRIPTION("Qualcomm RPMHPD cooling device driver"); +MODULE_LICENSE("GPL v2");