Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1032768AbdIZXz4 (ORCPT ); Tue, 26 Sep 2017 19:55:56 -0400 Received: from mail-wm0-f42.google.com ([74.125.82.42]:50326 "EHLO mail-wm0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966844AbdIZXzy (ORCPT ); Tue, 26 Sep 2017 19:55:54 -0400 X-Google-Smtp-Source: AOwi7QA4gIzB8RQd6sfqTgBgmUZgHw9cGPGtlD7aGyg1rEYJEX/QvrGQJVRaCiH2ujLJ1dfhU2eOlA== From: Daniel Lezcano To: edubezval@gmail.com Cc: leo.yan@linaro.org, Zhang Rui , linux-pm@vger.kernel.org (open list:THERMAL), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] thermal/drivers/hisi: Switch to interrupt mode Date: Wed, 27 Sep 2017 01:54:09 +0200 Message-Id: <1506470049-12597-1-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2790 Lines: 83 At this moment, we have both the interrupt setup and the polling enabled. The interrupt does nothing more than forcing an update while the temperature is polled every second. We can do much better than that, threshold is set to 65C in the DT and the passive ooling device enters in the dance when 75C is reached. We need to sample the temperature at 65C in order to let the IPA gather enough values for the PID computation. If the SoC is running at a temperature below 65C, we will be constantly polling for nothing. This patch disables the sensor when the temperature is below the temperature and enables it when passing the threshold. It resuls the sensor thermal sensor driver will have no activity most of the time. Signed-off-by: Daniel Lezcano --- drivers/thermal/hisi_thermal.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c index 39f4627..74ea70d 100644 --- a/drivers/thermal/hisi_thermal.c +++ b/drivers/thermal/hisi_thermal.c @@ -218,6 +218,15 @@ static int hisi_thermal_get_temp(void *__data, int *temp) return 0; } +static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, + bool on) +{ + struct thermal_zone_device *tzd = sensor->tzd; + + tzd->ops->set_mode(tzd, + on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); +} + static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = { .get_temp = hisi_thermal_get_temp, }; @@ -236,12 +245,16 @@ static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n", temp, sensor->thres_temp); + hisi_thermal_toggle_sensor(&data->sensor, true); + thermal_zone_device_update(data->sensor.tzd, THERMAL_EVENT_UNSPECIFIED); } else if (temp < sensor->thres_temp) { dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n", temp, sensor->thres_temp); + + hisi_thermal_toggle_sensor(&data->sensor, false); } return IRQ_HANDLED; @@ -286,15 +299,6 @@ static const struct of_device_id of_hisi_thermal_match[] = { }; MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); -static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, - bool on) -{ - struct thermal_zone_device *tzd = sensor->tzd; - - tzd->ops->set_mode(tzd, - on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); -} - static int hisi_thermal_setup(struct hisi_thermal_data *data) { struct hisi_thermal_sensor *sensor; @@ -393,7 +397,7 @@ static int hisi_thermal_probe(struct platform_device *pdev) return ret; } - hisi_thermal_toggle_sensor(&data->sensor, true); + hisi_thermal_toggle_sensor(&data->sensor, false); return 0; } -- 2.7.4