From patchwork Wed Nov 17 10:34:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Oleksij Rempel X-Patchwork-Id: 12624345 X-Patchwork-Delegate: daniel.lezcano@linaro.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15DF7C433F5 for ; Wed, 17 Nov 2021 10:34:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E31C863212 for ; Wed, 17 Nov 2021 10:34:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234840AbhKQKhp (ORCPT ); Wed, 17 Nov 2021 05:37:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236444AbhKQKho (ORCPT ); Wed, 17 Nov 2021 05:37:44 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F21F0C061570 for ; Wed, 17 Nov 2021 02:34:45 -0800 (PST) Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mnIGy-0000KM-1Y; Wed, 17 Nov 2021 11:34:36 +0100 Received: from ore by dude.hi.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1mnIGs-000LR3-3P; Wed, 17 Nov 2021 11:34:30 +0100 From: Oleksij Rempel To: Shawn Guo , Sascha Hauer Cc: Oleksij Rempel , Amit Kucheria , Andrzej Pietrasiewicz , Daniel Lezcano , Fabio Estevam , NXP Linux Team , Pengutronix Kernel Team , Zhang Rui , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, David Jander , Petr Benes , =?utf-8?b?TWljaGFsIFZva8OhxI0=?= Subject: [PATCH v3] thermal: imx: implement runtime PM support Date: Wed, 17 Nov 2021 11:34:26 +0100 Message-Id: <20211117103426.81813-1-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-pm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Starting with commit d92ed2c9d3ff ("thermal: imx: Use driver's local data to decide whether to run a measurement") this driver stared using irq_enabled flag to make decision to power on/off the thermal core. This triggered a regression, where after reaching critical temperature, alarm IRQ handler set irq_enabled to false, disabled thermal core and was not able read temperature and disable cooling sequence. In case the cooling device is "CPU/GPU freq", the system will run with reduce performance until next reboot. To solve this issue, we need to move all parts implementing hand made runtime power management and let it handle actual runtime PM framework. Fixes: d92ed2c9d3ff ("thermal: imx: Use driver's local data to decide whether to run a measurement") Signed-off-by: Oleksij Rempel Signed-off-by: Oleksij Rempel Tested-by: Petr Beneš --- drivers/thermal/imx_thermal.c | 145 +++++++++++++++++++++------------- 1 file changed, 91 insertions(+), 54 deletions(-) diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c index 2c7473d86a59..16663373b682 100644 --- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -15,6 +15,7 @@ #include #include #include +#include #define REG_SET 0x4 #define REG_CLR 0x8 @@ -194,6 +195,7 @@ static struct thermal_soc_data thermal_imx7d_data = { }; struct imx_thermal_data { + struct device *dev; struct cpufreq_policy *policy; struct thermal_zone_device *tz; struct thermal_cooling_device *cdev; @@ -252,44 +254,15 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp) const struct thermal_soc_data *soc_data = data->socdata; struct regmap *map = data->tempmon; unsigned int n_meas; - bool wait, run_measurement; u32 val; + int ret; - run_measurement = !data->irq_enabled; - if (!run_measurement) { - /* Check if a measurement is currently in progress */ - regmap_read(map, soc_data->temp_data, &val); - wait = !(val & soc_data->temp_valid_mask); - } else { - /* - * Every time we measure the temperature, we will power on the - * temperature sensor, enable measurements, take a reading, - * disable measurements, power off the temperature sensor. - */ - regmap_write(map, soc_data->sensor_ctrl + REG_CLR, - soc_data->power_down_mask); - regmap_write(map, soc_data->sensor_ctrl + REG_SET, - soc_data->measure_temp_mask); - - wait = true; - } - - /* - * According to the temp sensor designers, it may require up to ~17us - * to complete a measurement. - */ - if (wait) - usleep_range(20, 50); + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; regmap_read(map, soc_data->temp_data, &val); - if (run_measurement) { - regmap_write(map, soc_data->sensor_ctrl + REG_CLR, - soc_data->measure_temp_mask); - regmap_write(map, soc_data->sensor_ctrl + REG_SET, - soc_data->power_down_mask); - } - if ((val & soc_data->temp_valid_mask) == 0) { dev_dbg(&tz->device, "temp measurement never finished\n"); return -EAGAIN; @@ -328,6 +301,8 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp) enable_irq(data->irq); } + pm_runtime_put(data->dev); + return 0; } @@ -335,24 +310,16 @@ static int imx_change_mode(struct thermal_zone_device *tz, enum thermal_device_mode mode) { struct imx_thermal_data *data = tz->devdata; - struct regmap *map = data->tempmon; - const struct thermal_soc_data *soc_data = data->socdata; if (mode == THERMAL_DEVICE_ENABLED) { - regmap_write(map, soc_data->sensor_ctrl + REG_CLR, - soc_data->power_down_mask); - regmap_write(map, soc_data->sensor_ctrl + REG_SET, - soc_data->measure_temp_mask); + pm_runtime_get(data->dev); if (!data->irq_enabled) { data->irq_enabled = true; enable_irq(data->irq); } } else { - regmap_write(map, soc_data->sensor_ctrl + REG_CLR, - soc_data->measure_temp_mask); - regmap_write(map, soc_data->sensor_ctrl + REG_SET, - soc_data->power_down_mask); + pm_runtime_put(data->dev); if (data->irq_enabled) { disable_irq(data->irq); @@ -393,6 +360,11 @@ static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, int temp) { struct imx_thermal_data *data = tz->devdata; + int ret; + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + return ret; /* do not allow changing critical threshold */ if (trip == IMX_TRIP_CRITICAL) @@ -406,6 +378,8 @@ static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, imx_set_alarm_temp(data, temp); + pm_runtime_put(data->dev); + return 0; } @@ -681,6 +655,8 @@ static int imx_thermal_probe(struct platform_device *pdev) if (!data) return -ENOMEM; + data->dev = &pdev->dev; + map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); if (IS_ERR(map)) { ret = PTR_ERR(map); @@ -800,6 +776,16 @@ static int imx_thermal_probe(struct platform_device *pdev) data->socdata->power_down_mask); regmap_write(map, data->socdata->sensor_ctrl + REG_SET, data->socdata->measure_temp_mask); + /* After power up, we need a delay before first access can be done. */ + usleep_range(20, 50); + + /* the core was configured and enabled just before */ + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(data->dev); + + ret = pm_runtime_resume_and_get(data->dev); + if (ret < 0) + goto disable_runtime_pm; data->irq_enabled = true; ret = thermal_zone_device_enable(data->tz); @@ -814,10 +800,15 @@ static int imx_thermal_probe(struct platform_device *pdev) goto thermal_zone_unregister; } + pm_runtime_put(data->dev); + return 0; thermal_zone_unregister: thermal_zone_device_unregister(data->tz); +disable_runtime_pm: + pm_runtime_put_noidle(data->dev); + pm_runtime_disable(data->dev); clk_disable: clk_disable_unprepare(data->thermal_clk); legacy_cleanup: @@ -829,13 +820,9 @@ static int imx_thermal_probe(struct platform_device *pdev) static int imx_thermal_remove(struct platform_device *pdev) { struct imx_thermal_data *data = platform_get_drvdata(pdev); - struct regmap *map = data->tempmon; - /* Disable measurements */ - regmap_write(map, data->socdata->sensor_ctrl + REG_SET, - data->socdata->power_down_mask); - if (!IS_ERR(data->thermal_clk)) - clk_disable_unprepare(data->thermal_clk); + pm_runtime_put_noidle(data->dev); + pm_runtime_disable(data->dev); thermal_zone_device_unregister(data->tz); imx_thermal_unregister_legacy_cooling(data); @@ -858,29 +845,79 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev) ret = thermal_zone_device_disable(data->tz); if (ret) return ret; + + return pm_runtime_force_suspend(data->dev); +} + +static int __maybe_unused imx_thermal_resume(struct device *dev) +{ + struct imx_thermal_data *data = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_force_resume(data->dev); + if (ret) + return ret; + /* Enabled thermal sensor after resume */ + return thermal_zone_device_enable(data->tz); +} + +static int __maybe_unused imx_thermal_runtime_suspend(struct device *dev) +{ + struct imx_thermal_data *data = dev_get_drvdata(dev); + const struct thermal_soc_data *socdata = data->socdata; + struct regmap *map = data->tempmon; + int ret; + + ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, + socdata->measure_temp_mask); + if (ret) + return ret; + + ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, + socdata->power_down_mask); + if (ret) + return ret; + clk_disable_unprepare(data->thermal_clk); return 0; } -static int __maybe_unused imx_thermal_resume(struct device *dev) +static int __maybe_unused imx_thermal_runtime_resume(struct device *dev) { struct imx_thermal_data *data = dev_get_drvdata(dev); + const struct thermal_soc_data *socdata = data->socdata; + struct regmap *map = data->tempmon; int ret; ret = clk_prepare_enable(data->thermal_clk); if (ret) return ret; - /* Enabled thermal sensor after resume */ - ret = thermal_zone_device_enable(data->tz); + + ret = regmap_write(map, socdata->sensor_ctrl + REG_CLR, + socdata->power_down_mask); + if (ret) + return ret; + + ret = regmap_write(map, socdata->sensor_ctrl + REG_SET, + socdata->measure_temp_mask); if (ret) return ret; + /* + * According to the temp sensor designers, it may require up to ~17us + * to complete a measurement. + */ + usleep_range(20, 50); + return 0; } -static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, - imx_thermal_suspend, imx_thermal_resume); +static const struct dev_pm_ops imx_thermal_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(imx_thermal_suspend, imx_thermal_resume) + SET_RUNTIME_PM_OPS(imx_thermal_runtime_suspend, + imx_thermal_runtime_resume, NULL) +}; static struct platform_driver imx_thermal = { .driver = {